- Evidence for a stepwise addition of carbenes to strained double bonds: Reactions of dihalocarbenes with cyclopropenes
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Zwitterionic species are most likely the intermediates for the formation of 1,1-dihalo-2,3-diarylbutadienes by addition of dihalocarbenes to 1,2-diarylcyclopropenes [Eq. (a)]. Bicyclobutanes can be ruled out as intermediates for the formation of butadiene
- Weber,Brinker
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p. 1623 - 1626
(2007/10/03)
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- First formation of 1,1-dihalo-1,3-butadienes from reactions of dichloro- and dibromocarbenes with cyclopropenes via new addition-rearrangements
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New dichloro- and dibromocarbene addition-rearrangements are reported. In the reactions of 1,2-diarylcyclopropenes with difluoro-, dichloro-, dibromo-, and bromofluorocarbene, 2,3-diaryl-1,1-dihalo-1,3-butadienes are formed. In addition, 1,3-diaryl-2,3-dihalocyclo-1-butenes are formed. For the formation of the 1,1-dihalobutadienes, new addition-rearrangement mechanisms are proposed. Furthermore, some reactions of cyclobutenes with dihalocarbenes are described.
- Weber, Juergen,Xu, Linxiao,Brinker, Udo H.
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p. 4537 - 4540
(2007/10/02)
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