Efficient cis-to-trans isomerization of 1,4- dihalobutene-2
Номер патента: CA1297500C
Опубликовано: 17-03-1992
Автор(ы): Clarence E. Clark, Jr., Richard G. Fayter, Jr.
Принадлежит: National Destillers and Chemical Corp
Опубликовано: 17-03-1992
Автор(ы): Clarence E. Clark, Jr., Richard G. Fayter, Jr.
Принадлежит: National Destillers and Chemical Corp
Реферат: Abstract of the Disclosure This invention relates to an efficient cis-to-trans isomerization of 1,4-dihalobutene-2 by means of a thiol or hydroyen bromide or hydrogen chloride catalyzed reaction. Said isomerization provides a high trans content greater than 90% which in turn is eminently suitable for condensation with malonic esters to provide excellent yields of dimethyl 2-vinylcyclopropane-1, 1-dicarboxylate with greater than 95% purity and with substantial elimination of 3,4-dichloro-butene-1.
Rhodium based catalysts for the synthesis of 1,4-dienes
Номер патента: US3742080A. Автор: A Su. Владелец: EI Du Pont de Nemours and Co. Дата публикации: 1973-06-26.