作者:Shuntaro Mataka、Seung Taeg Lee、Masashi Tashiro
DOI:10.1039/p29900002017
日期:——
The photolyses of 5,6,7,12,13,14-hexahydro-6,13-methanodibenzo[A,F]cyclodecen-15-ones 1, 2 and 3 have been investigated. After Norrish type 1 cleavage, diester 1 gave the alkenes E-5 and Z-5via loss of carbon monoxide and hydrogen transfer, while 2 and 3 gave ketenes 10a and 10b, respectively, by transannular migration of an α-hydrogen, which was quenched with MeOH, giving the monoester 6 and diesters
5,6,7,12,13,14六氢-6,13- methanodibenzo的photolyses [A,F] cyclodecen-15酮1,2和3进行了研究。在Norrish 1型裂解后,二酯1通过一氧化碳的损失和氢的转移产生了烯烃E - 5和Z - 5,而2和3通过环过环转移了α-氢,分别得到了烯酮10a和10b。用甲醇骤冷,给单酯6和二酯顺- 11和反式-分别为11。氘代2和3的光解表明氢转移是分子内过程,而Norrish 1型裂解是决定速率的步骤(K H / K D = 1.09±0.05)。萘是有效灭火的光解1,2和3在-70℃,但淬火是不完全的,在5℃。据推测,两个环状苯环可能通过立体动力学反转而包围羰基,并且萘分子的距离不能足够接近以进行能量转移。