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1991 Volume 2 Issue 7
1991, 2(7): 501-504
Abstract:
The anion of heterocyclic ketene aminals 1 reacted with 2, 4-dinitro-halobenzenes 2 to give an arylated product 3 through the radical nucleophilic substitution confirmed by ESR spectroscopy, ESR-spin trapping technique, and depression of the reaction rate by the addition of inhibitor.
The anion of heterocyclic ketene aminals 1 reacted with 2, 4-dinitro-halobenzenes 2 to give an arylated product 3 through the radical nucleophilic substitution confirmed by ESR spectroscopy, ESR-spin trapping technique, and depression of the reaction rate by the addition of inhibitor.
1991, 2(7): 505-508
Abstract:
the regioselectivity in the oxidation of different types of ketone compounds 1--6 with an oxidative reagent system, KH/O2/18-Crown-6/THF is described.From these oxidative products, the various lactones have been prepared.
the regioselectivity in the oxidation of different types of ketone compounds 1--6 with an oxidative reagent system, KH/O2/18-Crown-6/THF is described.From these oxidative products, the various lactones have been prepared.
1991, 2(7): 509-512
Abstract:
6α-Hydroxy-stigmasta-4, 22-diene-3-one 1, a novel steroid, was isolated from the Eichhornia Crassipes.Its structure was determined by 1H and 13C NMR spectroscopy and further confirmed by authentic sample, which was synthesized from stigmasterol 2.
6α-Hydroxy-stigmasta-4, 22-diene-3-one 1, a novel steroid, was isolated from the Eichhornia Crassipes.Its structure was determined by 1H and 13C NMR spectroscopy and further confirmed by authentic sample, which was synthesized from stigmasterol 2.
1991, 2(7): 513-514
Abstract:
6, 7-Methylenedioxy-3-thia-1(2H, 4H)acridone and the related acridine-fused quinolines and pyridines, and also their flavylium-perchlorates were synthesized.The structures of all these compounds prepared are characterized by elemental analysis.IR and H-NMR spectra.
6, 7-Methylenedioxy-3-thia-1(2H, 4H)acridone and the related acridine-fused quinolines and pyridines, and also their flavylium-perchlorates were synthesized.The structures of all these compounds prepared are characterized by elemental analysis.IR and H-NMR spectra.
1991, 2(7): 515-516
Abstract:
2-chloromethylbenzoxaline reacted with aromatic aldehydes in alkaline solution, giving Darzens condensation product:2-aryl-3-benzoxalinyloxiranes.
2-chloromethylbenzoxaline reacted with aromatic aldehydes in alkaline solution, giving Darzens condensation product:2-aryl-3-benzoxalinyloxiranes.
1991, 2(7): 517-520
Abstract:
Comparative experiments show that ultrasonic irradiation reduces the reaction times and improves the yields in the di-alkylation and cyclo-di-alkylation of ethyl cyanoacetate under solid-liquid phase transfer conditions.
Comparative experiments show that ultrasonic irradiation reduces the reaction times and improves the yields in the di-alkylation and cyclo-di-alkylation of ethyl cyanoacetate under solid-liquid phase transfer conditions.
1991, 2(7): 521-522
Abstract:
The synthesis of 4, 5-secocholestane and 4-methyl-4, 5-secocholestane from cholesterol are reported.
The synthesis of 4, 5-secocholestane and 4-methyl-4, 5-secocholestane from cholesterol are reported.
1991, 2(7): 523-524
Abstract:
The acetylated glycopyranosyl azides (5-8) were obtained in high yields with stereoselectivity by phase-transfer catalyzed(PTC)synthesis, and their structures were confirmed depending upon elemental analysis and IR, 1H, 13C-NMR spectral data.
The acetylated glycopyranosyl azides (5-8) were obtained in high yields with stereoselectivity by phase-transfer catalyzed(PTC)synthesis, and their structures were confirmed depending upon elemental analysis and IR, 1H, 13C-NMR spectral data.
1991, 2(7): 525-526
Abstract:
A method of synthesis of 4, 6-disubstituted 5-thioxo-1, 2, 4-triazin-3-ones from benzothioformanilides and semicarbazide is described.And six new compounds were synthesized by this method.
A method of synthesis of 4, 6-disubstituted 5-thioxo-1, 2, 4-triazin-3-ones from benzothioformanilides and semicarbazide is described.And six new compounds were synthesized by this method.
1991, 2(7): 527-528
Abstract:
The yield and stereoselectivity of the Diels-Alder reactions between furan(or 2-methylfuran)and different dienophiles are markedly enhanced by the catalysis of anhydrous YbCl3.
The yield and stereoselectivity of the Diels-Alder reactions between furan(or 2-methylfuran)and different dienophiles are markedly enhanced by the catalysis of anhydrous YbCl3.
1991, 2(7): 529-530
Abstract:
A new coordination compound of cis-bis(1, 10-phenanthroline)glycinecobalt(Ⅲ)chloridate tetrahydrate, cis-[Co(phen)2gly]Cl2.4H2O, has been prepared by glycine reacted with cis-[Co(phen)2Cl2]Cl, then isolated by SP-Sephadex C-25 H+ form column.The crystal and molecular structure of the new compound has been determined by RIGAKUAFC5R four circle diffractometer, 5032 independent reflections were collected of which 3781 observable reflections were used for structure refinement.The crystal is monoclinic, space group C2/c, with a=35.13(1) Å, b=9.637(3) Å, c=17.485(6) Å, β=115.08(2)a, V=5362(3) Å3, Z=8.The structure was refined by full matrix least-squares procedure to a final R=0.041 and Rω=0.060.The molecular formula was CoC28H28N5O8Cl2.with molecular weight Mr=636.38, Dc=1.58g/cm3, μ=8.88cm-1 and F(000)=2624.
A new coordination compound of cis-bis(1, 10-phenanthroline)glycinecobalt(Ⅲ)chloridate tetrahydrate, cis-[Co(phen)2gly]Cl2.4H2O, has been prepared by glycine reacted with cis-[Co(phen)2Cl2]Cl, then isolated by SP-Sephadex C-25 H+ form column.The crystal and molecular structure of the new compound has been determined by RIGAKUAFC5R four circle diffractometer, 5032 independent reflections were collected of which 3781 observable reflections were used for structure refinement.The crystal is monoclinic, space group C2/c, with a=35.13(1) Å, b=9.637(3) Å, c=17.485(6) Å, β=115.08(2)a, V=5362(3) Å3, Z=8.The structure was refined by full matrix least-squares procedure to a final R=0.041 and Rω=0.060.The molecular formula was CoC28H28N5O8Cl2.with molecular weight Mr=636.38, Dc=1.58g/cm3, μ=8.88cm-1 and F(000)=2624.
1991, 2(7): 531-534
Abstract:
Rapid addition of alcohols to 1, 2, 3-diazaphosphole 1 easily gave tricoordinated phosphorus compounds, which were sulfurized to tetracoordinated phosphorus compounds.When ethylene glycol and aminoethanol were used separately to react with 1, the tricoordinated phosphorus compounds which formed, rearranged to pentacoordinated phosphorus compounds and the substituents at N2 affected the rearrangement significantly
Rapid addition of alcohols to 1, 2, 3-diazaphosphole 1 easily gave tricoordinated phosphorus compounds, which were sulfurized to tetracoordinated phosphorus compounds.When ethylene glycol and aminoethanol were used separately to react with 1, the tricoordinated phosphorus compounds which formed, rearranged to pentacoordinated phosphorus compounds and the substituents at N2 affected the rearrangement significantly
1991, 2(7): 535-536
Abstract:
The reaction mechanism of the intramolecular cycloaddition of N-3-butenyl nitrone has been investigated theoretically by using AM1 MO method and transition state theory.There are two parallel reactions leading to two different regioisomers.The ratio of the rate constants of these two reactions was calculated to be 124.1(at 383.75 K).The obtained results can be used to explain the high regiospecificity of the reaction product.
The reaction mechanism of the intramolecular cycloaddition of N-3-butenyl nitrone has been investigated theoretically by using AM1 MO method and transition state theory.There are two parallel reactions leading to two different regioisomers.The ratio of the rate constants of these two reactions was calculated to be 124.1(at 383.75 K).The obtained results can be used to explain the high regiospecificity of the reaction product.
1991, 2(7): 537-538
Abstract:
An insecticidal sesquiterpene polyol ester, angulatin A, was isolated from the root bark of Celastrus angulatus.Its structure was established as 1α, 2α-diacetoxy-8β, 15-diisobutyryloxy-9α-benzoyloxy-4β, 6β-dihydroxydihyclro-β-agarofuran by spectroscopic methods.
An insecticidal sesquiterpene polyol ester, angulatin A, was isolated from the root bark of Celastrus angulatus.Its structure was established as 1α, 2α-diacetoxy-8β, 15-diisobutyryloxy-9α-benzoyloxy-4β, 6β-dihydroxydihyclro-β-agarofuran by spectroscopic methods.
1991, 2(7): 539-542
Abstract:
Three furanoid ent-clerodane diterpenoids, teupernin A, B and C have been isolated from the acetone extract of Teucrium pernyi Franch.Their structures were established by spectroscopic means(UV, IR, MS, 1H NMR, 13C NMR, H-H COSY, C-H COSY and NOE)and by comparison with related compounds.
Three furanoid ent-clerodane diterpenoids, teupernin A, B and C have been isolated from the acetone extract of Teucrium pernyi Franch.Their structures were established by spectroscopic means(UV, IR, MS, 1H NMR, 13C NMR, H-H COSY, C-H COSY and NOE)and by comparison with related compounds.
1991, 2(7): 543-544
Abstract:
Phylloketal(1), a new sesterterpene which belongs to the scalarane class of sesterterpenes with a 20, 24-bishomo-tetracyclic skeleton, has been isolated from the South China Sea sponge Phyllospongia foliascens, and its structure was characterized mainly by one and two-dimensional NMR.
Phylloketal(1), a new sesterterpene which belongs to the scalarane class of sesterterpenes with a 20, 24-bishomo-tetracyclic skeleton, has been isolated from the South China Sea sponge Phyllospongia foliascens, and its structure was characterized mainly by one and two-dimensional NMR.
1991, 2(7): 545-548
Abstract:
A new type of HPLC stationary phase containing thymine derivative was successfully prepared.It was found to give selective separation of nucleic acid bases and several purine derivatives, such as caffeine and theophylline.The retention behaviour and elution order of the solutes were interpreted in terms of molecular structure.
A new type of HPLC stationary phase containing thymine derivative was successfully prepared.It was found to give selective separation of nucleic acid bases and several purine derivatives, such as caffeine and theophylline.The retention behaviour and elution order of the solutes were interpreted in terms of molecular structure.
1991, 2(7): 549-550
Abstract:
ABSTRACT The Raman intensitics of gas molecules were found to be enormously enhanced in the presence of Hg-microdroplets.The enhancement factor for the molecules studied was found to be over 20.
ABSTRACT The Raman intensitics of gas molecules were found to be enormously enhanced in the presence of Hg-microdroplets.The enhancement factor for the molecules studied was found to be over 20.
1991, 2(7): 551-552
Abstract:
A rapid method of determination of BaP in various environmental samples, using synchronous fluorescence spectroscopy scanning in defined range of dual-wavelengths(SFDW)is described in this paper.
A rapid method of determination of BaP in various environmental samples, using synchronous fluorescence spectroscopy scanning in defined range of dual-wavelengths(SFDW)is described in this paper.
1991, 2(7): 553-554
Abstract:
The cluster compound [Mo4S4(μ-O2CC5H5)2(dtp)4](dtp=S2P(OEt)2)was obtained by the ligand substitution reaction of tetranuclear molybdenum cluster [Mo4S4(μ-dtp)2(dtp)4]in the mixed solvent of acetone, ethanol and water in the presence of C6H5CO2Na.It is monoclinic and crystallizes in space group C2/c, Mr=1495.09, a=12.175(5), b=22.01(1), c=20.875(9)Å, β=99.04(4)°V=5575(5)Å3;Z=4;Dc=1.78g/cm3.Final R factor is 0.066.The result reveals that the[Mo4S4] cluster core and t-(dtp)-1 ligands are retained and only μ-bridged(dtp)-1ligands are substituted by(C6H5CO2)-1 in the substitution reaction, thus producing the new title cluster compound, the structure of which contains two species of bidentate ligand.
The cluster compound [Mo4S4(μ-O2CC5H5)2(dtp)4](dtp=S2P(OEt)2)was obtained by the ligand substitution reaction of tetranuclear molybdenum cluster [Mo4S4(μ-dtp)2(dtp)4]in the mixed solvent of acetone, ethanol and water in the presence of C6H5CO2Na.It is monoclinic and crystallizes in space group C2/c, Mr=1495.09, a=12.175(5), b=22.01(1), c=20.875(9)Å, β=99.04(4)°V=5575(5)Å3;Z=4;Dc=1.78g/cm3.Final R factor is 0.066.The result reveals that the[Mo4S4] cluster core and t-(dtp)-1 ligands are retained and only μ-bridged(dtp)-1ligands are substituted by(C6H5CO2)-1 in the substitution reaction, thus producing the new title cluster compound, the structure of which contains two species of bidentate ligand.
1991, 2(7): 555-556
Abstract:
The crystal structure of di(α-hydroxyisobutyrate)diaquo neodymium nitrate Nd(C4H7O3)2NO32H2O was determined by X-ray diffraction analysis.It belongs to monoclinic, space group C2/C, with cell dimensionsa=8.996(1), b=8.601(1), c=21.111(3)Å, β=92.38°, V=1632.OÅ3, Z=4, Dc=1.83g/cm3.Crystal structure has been refined by full-matrix least-square techniques giving a final R value of 0.036.The neodymium atom is coordinated to eight oxygen atoms.The nitrate group in complex is not bonded to neodymium, each two neodymium atoms are linked by bridging carboxyl group forming a chain polymeric molecule.
The crystal structure of di(α-hydroxyisobutyrate)diaquo neodymium nitrate Nd(C4H7O3)2NO32H2O was determined by X-ray diffraction analysis.It belongs to monoclinic, space group C2/C, with cell dimensionsa=8.996(1), b=8.601(1), c=21.111(3)Å, β=92.38°, V=1632.OÅ3, Z=4, Dc=1.83g/cm3.Crystal structure has been refined by full-matrix least-square techniques giving a final R value of 0.036.The neodymium atom is coordinated to eight oxygen atoms.The nitrate group in complex is not bonded to neodymium, each two neodymium atoms are linked by bridging carboxyl group forming a chain polymeric molecule.
1991, 2(7): 557-560
Abstract:
(MeCp)2ZrCl(α-C10H7COO) has five-coordinate bent zirconocene in which the α-naphthoyloxy is a bidentate ligand(Zr-O 2.317(2), 2.260(2)ÅZr-Cl 2.521(1)ÅZr-C 2.480-2.550ÅZr-cent-CH3C5H4 2.217, 2.23OA;Cl-Zr-O1 134.8(1)0;Cl-Zr-O2 78.6(1)O;O1-Zr-O2 56.3(1)O).
(MeCp)2ZrCl(α-C10H7COO) has five-coordinate bent zirconocene in which the α-naphthoyloxy is a bidentate ligand(Zr-O 2.317(2), 2.260(2)ÅZr-Cl 2.521(1)ÅZr-C 2.480-2.550ÅZr-cent-CH3C5H4 2.217, 2.23OA;Cl-Zr-O1 134.8(1)0;Cl-Zr-O2 78.6(1)O;O1-Zr-O2 56.3(1)O).
1991, 2(7): 561-564
Abstract:
The copotymerizations of p-diethynyibenzene(PDEB)with phenytacetylene(PHA), 4, 4'-diethynytbiphenyt(DEBP)or m-diethynylbenzene(MDEB)are studied in various mole ratios of monomers.The sotubitity parameter(σp), swellabitity(θp), Huggins parameter(X), density (d425)and the average motecutar weights between crosstinks (Mc) of obtained copotymers are measured.The IR spectra of these copolymers are recorded.The mechanism about the polymerization of acetytenic derivatives initiated by(Ph3P)2PdCl2 is discussed.
The copotymerizations of p-diethynyibenzene(PDEB)with phenytacetylene(PHA), 4, 4'-diethynytbiphenyt(DEBP)or m-diethynylbenzene(MDEB)are studied in various mole ratios of monomers.The sotubitity parameter(σp), swellabitity(θp), Huggins parameter(X), density (d425)and the average motecutar weights between crosstinks (Mc) of obtained copotymers are measured.The IR spectra of these copolymers are recorded.The mechanism about the polymerization of acetytenic derivatives initiated by(Ph3P)2PdCl2 is discussed.
1991, 2(7): 565-566
Abstract:
The polymerization of methyl acrylate was sensitive to UV light.Under UV light, the rate of polymerization is 8 times as high as the rate in dark.The overall activation energy was decreased by the UV light(313nm).A tentative explanation is given and the mechanism is discussed.
The polymerization of methyl acrylate was sensitive to UV light.Under UV light, the rate of polymerization is 8 times as high as the rate in dark.The overall activation energy was decreased by the UV light(313nm).A tentative explanation is given and the mechanism is discussed.
1991, 2(7): 567-568
Abstract:
To investigate soapless emulsion copolymerization in the presence of a solid phase, copolymerization experiments were carried out for the styrene-butyl acrylate-K2S2O8-water system by using barium sulfate powder, which is assumed to be chemically inert.Reaction conditions were varied with respect to barium sulfate powder quantity, initiator concentration and temperature.These factors were investigated with respect to the effect on reaction rate and conversion, polymer particle number and diameter, and latex stability.
To investigate soapless emulsion copolymerization in the presence of a solid phase, copolymerization experiments were carried out for the styrene-butyl acrylate-K2S2O8-water system by using barium sulfate powder, which is assumed to be chemically inert.Reaction conditions were varied with respect to barium sulfate powder quantity, initiator concentration and temperature.These factors were investigated with respect to the effect on reaction rate and conversion, polymer particle number and diameter, and latex stability.
1991, 2(7): 569-570
Abstract:
The kinetics and the mechanism of the formation reactions of M(PnAO)2+(M=Ni, Co, Cu)were studied with UV Spectrophotometer and Stopped Flow Spectrophotometer and a three steps mechanism was suggested.
The kinetics and the mechanism of the formation reactions of M(PnAO)2+(M=Ni, Co, Cu)were studied with UV Spectrophotometer and Stopped Flow Spectrophotometer and a three steps mechanism was suggested.
1991, 2(7): 571-574
Abstract:
Two possible complexes formed by the interaction of CH3OH and H2CO, one hydrogen-bonded(Ⅰ) and one donor-acceptor complex(Ⅱ), have been reported in the previous paper(1).Based on the ab initio 6-31G basis set calculations, the properties of the charge density for the complexes have been analyzed using the theory of atoms in molecules(2-5).The nature of the complex formation has been discussed in terms of the properties of the charge density distributions.
Two possible complexes formed by the interaction of CH3OH and H2CO, one hydrogen-bonded(Ⅰ) and one donor-acceptor complex(Ⅱ), have been reported in the previous paper(1).Based on the ab initio 6-31G basis set calculations, the properties of the charge density for the complexes have been analyzed using the theory of atoms in molecules(2-5).The nature of the complex formation has been discussed in terms of the properties of the charge density distributions.
1991, 2(7): 575-576
Abstract:
The weight average molecular weights Mw, radii of gyration2>1/2second virial coefficients A2, and intrinsic viscosities in θ solvent [η]θ of five fractionated samples of the chinese lacquer polysaccharide were measured by light scattering and viscosimetry.It is further evidenced that the polysaccharide in aqueous solution exists as a compact coil resulted from highly branched structure.
The weight average molecular weights Mw, radii of gyration
1991, 2(7): 577-578
Abstract:
The mechanism of the thermolysis of thietane to form ethylene and thioformaldehyde has been studied by using ab initio SCF MO method at STO-3G* and 3-21G* level.It has been found that there are two possible stepwise pathways.One is to break C-C bond firstly, while the other is to break C-S bond at first.The cleavage of C-S bond is pre-ferred over that of C-C bond.
The mechanism of the thermolysis of thietane to form ethylene and thioformaldehyde has been studied by using ab initio SCF MO method at STO-3G* and 3-21G* level.It has been found that there are two possible stepwise pathways.One is to break C-C bond firstly, while the other is to break C-S bond at first.The cleavage of C-S bond is pre-ferred over that of C-C bond.
1991, 2(7): 579-580
Abstract:
The various surface species [HXRu3(CO)9(CCO)]2-X(X=0-2)prepared from impregnation of [PPN]2[Ru3(CO)9(CCO)] on SiO2-Al2O3, SiO2 and MgO show quite different activities and selectivities for oxygenates and ethane in ethylene hydroformylation.
The various surface species [HXRu3(CO)9(CCO)]2-X(X=0-2)prepared from impregnation of [PPN]2[Ru3(CO)9(CCO)] on SiO2-Al2O3, SiO2 and MgO show quite different activities and selectivities for oxygenates and ethane in ethylene hydroformylation.
1991, 2(7): 581-582
Abstract:
The two Co sites are well characterized in reduced Co-Mo/Al2O3 and Ru-Co-Mo/Al2O3 by new bands at 1895 and 1880 cm-1 in the IR spectra due to NO adsorption.
The two Co sites are well characterized in reduced Co-Mo/Al2O3 and Ru-Co-Mo/Al2O3 by new bands at 1895 and 1880 cm-1 in the IR spectra due to NO adsorption.
1991, 2(7): 583-586
Abstract:
Primary formation of methane and secondary formation of ethylene in methanol conversion are evidenced by temperature-programmed-surface-reaction of adsorbed methanol on HZSM-5 catalyst.A reaction mechanism accounts for the observed results is described.
Primary formation of methane and secondary formation of ethylene in methanol conversion are evidenced by temperature-programmed-surface-reaction of adsorbed methanol on HZSM-5 catalyst.A reaction mechanism accounts for the observed results is described.
1991, 2(7): 587-588
Abstract:
Complexes of La(Ⅲ), Nd(Ⅲ), Sm(Ⅲ), Eu(Ⅲ), Gd(Ⅲ), Dy(Ⅲ), Er(Ⅲ), Yb(Ⅲ)and Y(Ⅲ) with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characterized by elemental analysis, molar conductance, i.r., UV and 1H n.m.r.spectra, magnetic measurements, X-ray powder diffraction and DTA.
Complexes of La(Ⅲ), Nd(Ⅲ), Sm(Ⅲ), Eu(Ⅲ), Gd(Ⅲ), Dy(Ⅲ), Er(Ⅲ), Yb(Ⅲ)and Y(Ⅲ) with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characterized by elemental analysis, molar conductance, i.r., UV and 1H n.m.r.spectra, magnetic measurements, X-ray powder diffraction and DTA.
1991, 2(7): 589-592
Abstract:
The UV-VIS spectroscopic studies of phycoerythrobilin dimethyl ester, phycocyanobilin dimethyl ester and their derivatives indicate that shortening of the conjugative systems induces hypsochromic shifts in wavelength and increases in molar extinction coefficients in visible part;both zinc ion coordination and acetic acid treatment induce bathochromic effects for the phycobilins and their derivatives.
The UV-VIS spectroscopic studies of phycoerythrobilin dimethyl ester, phycocyanobilin dimethyl ester and their derivatives indicate that shortening of the conjugative systems induces hypsochromic shifts in wavelength and increases in molar extinction coefficients in visible part;both zinc ion coordination and acetic acid treatment induce bathochromic effects for the phycobilins and their derivatives.
1991, 2(7): 593-594
Abstract:
The intramolecular aromatic-ring stacking interaction of mixedligand complex Pd(A)(UTP)2- in the system pd2+-A-UTP4- has been determined by 1HNMR, where A=1, 10-phenanthroline(phen), 2, 2'-bipyridyl(bpy)and DL-tryptophan(trp-);UTP4-=uridine 5-triphosphate.The result indicates that it is the partial stacking between the uracil ring of UTP4- and the heterocyclic ring of A that makes H(5), H(6) and H(1') in the UTP4- shift upfield significantly.Accordingly, the order of aromaticring interaction in the mixedligand complex has been obtained as follows:Pd(phen)(UTP)2- > Pd(bpy)(UTP)2- > Pd(trp)(UTP)3-.
The intramolecular aromatic-ring stacking interaction of mixedligand complex Pd(A)(UTP)2- in the system pd2+-A-UTP4- has been determined by 1HNMR, where A=1, 10-phenanthroline(phen), 2, 2'-bipyridyl(bpy)and DL-tryptophan(trp-);UTP4-=uridine 5-triphosphate.The result indicates that it is the partial stacking between the uracil ring of UTP4- and the heterocyclic ring of A that makes H(5), H(6) and H(1') in the UTP4- shift upfield significantly.Accordingly, the order of aromaticring interaction in the mixedligand complex has been obtained as follows:Pd(phen)(UTP)2- > Pd(bpy)(UTP)2- > Pd(trp)(UTP)3-.
