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Anti-Markovnikov hydration of alkenes over platinum-loaded titanium oxide photocatalyst

机译:在铂负载的氧化钛光催化剂上,烷烃的抗马科夫尼科夫水合

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Hydration of various alkenes proceeded over a platinum-loaded titanium oxide photocatalyst It is notable that, unlike conventional acid-catalysts, the photocatalyst preferentially promoted the hydration according to the anti-Markovnikov rule. The results of some reaction experiments and semiempirical molecular orbital calculations suggested the reaction path of this hydration as follows: an electrophilic surface oxygen radical species formed on the photoexcited titanium oxide attacks a carbon double bond of the alkene to produce an intermediate, followed by the addition of a hydrogen radical formed on the platinum sites to produce an alcohol. The anti-Markovnikov selectivity for each investigated alkene would be determined by the stability of the radical intermediate.
机译:各种烷烃的水合在铂载氧化钛光催化剂上进行,值得注意的是,与常规的酸性催化剂不同,光催化剂优先根据抗马科夫尼科夫规则优先促进水合。 某些反应实验和半经验分子轨道计算的结果表明,这种水合的反应路径如下:在光激发氧化钛在氧化钛上形成的亲电表面氧自由基物种攻击了烯烃的碳双键,以产生中间体,然后再加上添加 在铂部位形成的氢自由基生产酒精。 每个研究的烯烃的抗马科夫尼科夫选择性将取决于自由基中间体的稳定性。

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