1,1-二甲基锗杂环丁烷 以
gas 为溶剂,
以35%的产率得到1,1,2,2-tetramethyl-1,2-digermacyclopentane
参考文献:
名称:
Kinetics and mechanism of the thermal decomposition of 1,1-dimethylgermetane
摘要:
The gas-phase unimolecular decomposition of 1,1-dimethylgermetane has been investigated over the temperature range 683.9-751.2 K at pressures of ca. 15 Torr. Four products, cyclopropane, propene, ethene, and 1,1,2,2-tetramethylgermacyclopentane, are formed. Arrhenius parameters for the primary decomposition channels to (1) 1,1-dimethylgermene and ethene and (2) dimethylgermylene, cyclopropane, and propene are reported: (1) log k1/s-1 = 14.7 +/- 0.4 - 63.1 +/- 1.2 kcal mol-1/RT ln 10; (2) log k2/s-1 = 14.1 +/- 0.3 - 60.7 +/- 0.8 kcal mol-1/RT ln 10.[GRAPHICS]The surprisingly high activation energy for the 2 + 2 cycloreversion is interpreted in terms of a strong Ge-C bond dissociation enthalpy and/or reduced ring strain in the germetane.
Kinetics and mechanism of the thermal decomposition of 1,1-dimethylgermetane
作者:Mohammed Namavari、Robert T. Conlin
DOI:10.1021/om00046a031
日期:1992.10
The gas-phase unimolecular decomposition of 1,1-dimethylgermetane has been investigated over the temperature range 683.9-751.2 K at pressures of ca. 15 Torr. Four products, cyclopropane, propene, ethene, and 1,1,2,2-tetramethylgermacyclopentane, are formed. Arrhenius parameters for the primary decomposition channels to (1) 1,1-dimethylgermene and ethene and (2) dimethylgermylene, cyclopropane, and propene are reported: (1) log k1/s-1 = 14.7 +/- 0.4 - 63.1 +/- 1.2 kcal mol-1/RT ln 10; (2) log k2/s-1 = 14.1 +/- 0.3 - 60.7 +/- 0.8 kcal mol-1/RT ln 10.[GRAPHICS]The surprisingly high activation energy for the 2 + 2 cycloreversion is interpreted in terms of a strong Ge-C bond dissociation enthalpy and/or reduced ring strain in the germetane.