Photochemical Reactions. Part 63 [1]. The photodecarbonylation of α-aryl aldehydes
作者:H. Küntzel、H. Wolf、K. Schaffner
DOI:10.1002/hlca.19710540312
日期:1971.4.20
Ultraviolet irradiation of the aldehydes 6–11 in degassed solutions results exclusively in decarbonylation to the major products 34, 35 and 37–40, and to small amounts of 2, 3-diphenyl-2, 3-dimethyl-butanes 36 from the phenyl aldehydes 6 and 7. In the presence of tri-n-butylstannane, incorporation of stannane hydrogen competes, to substrate-specific limits, with the intramolecular deuterium transfer in
醛的紫外线照射6 - 11在排他地在脱羰基的主要产品脱气的解决方案的结果34,35和37 - 40,以及少量的2,3-二苯基2,3二甲基丁烷36从苯基醛6和7。在三-的存在Ñ -butylstannane,锡烷氢竞速赛的掺入,对具体底物的限制,并在分子内氘转移7 35和11 40。对于苯醛6和苯甲醛,脱羰基的量子产率为Φ〜0.4-1.0。9,和0.02 8.哈米特Φ与共振常数(相关性[R )为6(X = H,p -CH 3,OCH 3)和(CF 3)中,用ω米+为值元取代的异构体是与拟议的将α-裂解为仅具有中等自由基特征的相关自由基对作为主要的光化学步骤相一致。