Direct determination of reaction heat in intramolecular hydrogen abstraction of excited 2-methylbenzophenone

被引：13

作者：

Suzuki, T

Okuyama, U

Ichimura, T

机构：

[1] Department of Chemistry, Tokyo Institute of Technology, Tokyo 152, 2-12-1 Ohokayama, Meguro-ku

来源：

CHEMICAL PHYSICS LETTERS | 1997年 / 266卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(96)01538-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Time-resolved thermal lensing (TRTL) technique was applied to the determination of reaction heats of intramolecular hydrogen abstraction for excited 2-methylbenzophenone (MBP). Excited MBP abstracts a hydrogen atom from the neighboring methyl group to form cis- and trans-enols, whose lifetimes were 3.8. mu s and 5.8 ms, respectively. Heats of reaction for the production of cis- and trans-enols were successfully determined to be 116 and 202 kJ/mol, respectively, The large energy gap (86 kJ/mol) implies that the structure of the trans form should be less planar because of vinyl/phenyl steric hinderance.

引用

页码：107 / 110

页数：4

共 10 条

[1]

BRASLAVSKY SE, 1988, HDB ORGANIC PHOTOCHE

[2] FORMATION OF 2 PHOTOENOLS VIA A COMMON PATHWAY IN THE PHOTOCHEMISTRY OF 2-METHYLBENZOPHENONE [J].