Citation:
Yao Zeng SHI, Li Kin WANG, Zheng Ming DU, Hong Wen HU. NOVEL BIS-(N-ALKYL-N,N-DIMETHYL AMMONIUM)POLYETHYLENEGLYCOL ETHER SALIS AS PHASE TRANSFER CATALYSTS IN THE CONDENSATION OF 1,4-DIACETYL-2,5-PIPERAZINEDIONE AND ALDEHYDES[J]. Chinese Chemical Letters,
;1993, 4(12): 1057-1060.
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Five novel bis-(N-alkyl-N, N-dimethyl ammonium) polyethyleneglyool ether salts prepared by our previously reported procedare show high catalytic efficiency in the condensation of 1, 4-diacetyl-2, 5-piperazinedione and aldehydes at both higher and lower temperature even in lower concentration. They also show catalytic selectivity at lower temperature.
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