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Photochemistry of Aliphatic Thioketones in the Gas Phase

机译:气相中脂肪族锡酮的光化学

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摘要

The solution and gas-phase photophysical and photochemical properties of a series of bicyclic and alicyclic thioketones (apothiocamphor (1), thiocamphor (2), thiofenchone (3), endo-5, 6-trimethylene-2-norborneanthione (4), 3, 3-diethylbicyclo[3.2.1]octane-2-thione (5), 2, 2-diethyl-5, 5-dimethylcyclopentanethione (6), 2-ethyl-2, 6, 6-trimethylcyclohexanethione (7), and 2, 4, 4-trimethyl-3-hexanethione (8)) are reported. Photolysis in solution typically gives rise to products arising from insertion into β, γ, and, in one case (4), δ carbons to form cyclic thiols. This chemistry is analogous to that observed in earlier studies. Novel photochemistry is found in the gas phase where Norrish type II products are also isolated from several substrates (1, 2, 5, 6, and 7). The effect of the quencher gas, butane, on both the spectral and photochemical properties of 2 in the gas phase provide evidence to support the proposal that the Norrish type II chemistry arises from initially populated vibrationally excited levels of S_2.
机译:一系列双环和脂环式硫酮(脱硫基樟脑(1),硫基樟脑(2),硫代孕酮(3),endo-5、6-三亚甲基-2-降冰片蒽酮(4),3的溶液和气相光物理和光化学性质,3-二乙基双环[3.2.1]辛烷-2-硫酮(5),2,2-二乙基-5、5-二甲基环戊硫酮(6),2-乙基-2、6、6-三甲基环己烷硫酮(7)和2报道了4,4,4-三甲基-3-己硫酮(8))。溶液中的光解通常会产生由插入β,γ和在一种情况(4)中插入δ碳形成环硫醇而产生的产物。这种化学反应类似于早期研究中观察到的化学反应。在气相中发现了新的光化学,其中还从几种底物(1、2、5、6和7)中分离了Norrish II型产物。淬火气体丁烷对气相中2的光谱和光化学性质的影响提供了证据,以支持Norrish II型化学源自最初填充的S_2振动激发能级的提议。

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