1-dibromo-2-vinylcyclopropane derivatives with MeLi yielded cyclopentadienes as the main products together with small amounts of allenic compounds (Table 1). By the same reaction 2,2,2′,2′-tetrabromobicyclopropyl derivatives yielded, in all but one case, only small amounts of diallenes; the exception is the exclusive formation of 2,7-dimethyl-2,3,5,6-octatetraene, (XIII) from2,2,2′,2′-tetrabromo-3,3,3′,
Preparation of Diadducts from Dienes and Dihalo-Carbenes. A General Sonochemical Method
作者:Terje Didriksen、Lars Skatteb⊘l
DOI:10.1080/00397919908086077
日期:1999.4
Diadducts were formed in excellent yields from reactions of dienes with chloroform or bromoform, powdered sodium hydroxide and benzyltriethylammonium chloride as catalyst using ultrasound.
Chemistry of gem-Dihalocyclopropanes. II.<sup>1</sup> The Reaction of Dienes with Dibromocarbene