Product distributions in the dehydrochlorination of some chloroalkanes over alumina, silica-alumina, and potassium hydroxide-silica gel
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説明
Dehydrochlorination of five kinds of chloroalkanes which may give several isomeric products was investigated over alumina (A), silica-alumina (SA), and potassium hydroxide supported on silica gel (K S) to discuss the characteristic properties of alumina in the elimination reactions. The product distributions from four chloroalkanes were well explained in terms of an E2 concerted mechanism on A, a carbonium ion mechanism on SA, and an E2 stepwise mechanism via a carbanion on K S. Trans isomers were preferred slightly to cis isomers on K S, whereas the cis isomers were predominant on A and SA, and especially the selectivity was very high on A. Stereospecific anti-eliminations were observable on A and K S, although the reaction was nonstereospecific over SA. Poisoning effects of acetic acid and n -butylamine were studied on A and its active sites for the dehydrochlorination are discussed.
収録刊行物
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- Journal of Catalysis
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Journal of Catalysis 43 264-272, 1976-06-30
Elsevier BV
