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Citation: Fu Xiaoyuan*, Ding Yanbo. THE TRANSITION STATE OF THE GAS PHASE PYROLYSIS OF β-PROPIOLACTONE[J]. Acta Physico-Chimica Sinica, ;1988, 4(01): 57-63. doi: 10.3866/PKU.WHXB19880111 shu

THE TRANSITION STATE OF THE GAS PHASE PYROLYSIS OF β-PROPIOLACTONE

Fu Xiaoyuan* ,
Ding Yanbo

1.
Chemistry Department; Beijing Normal University; Beijing

Received Date: 8 September 1986
Available Online: 15 February 1988

The reaction mechanism of the homogeneous prolysis of β-propiolactone (3-oxetanone) was studied by means of ab initio SCF MO method with 3-2lG basis set. There are two possible reaction channels:
C_2H_4+CO_2(1)←CH_2—C—O—CH_2→(2)CH_2=C=O+H_2CO
The geometries of the reactant, transition states and products of (1) and (2) have been optiminzed by energy gradient technique. Second order Mφller-Plesset perturbation (MP2) calculations were carried out at the HF optimized geometries to obtain better energetics. The activation barriers are 116.0 and 302.0 kJ mol~(-1) for (1) and (2) respectively. From the results of calculations it can be seen that pyrolysis must chiefly proceed via the reaction path (1). This conclusion is in accordance with experimental observations.
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