Halogenocycloprop anation des dioxolannes ethyleniques et des enones correspondantes par les monohalogenocarbenoides
作者:R. Barlet、M. Vincens
DOI:10.1016/0040-4020(77)84076-3
日期:1977.1
of conjugated enones and their dioxolanes has been achieved by monohalocarbenoîds generated from methylene chloride and gem-dichloroethane. In both cases, besides expected chloro-adducts, corresponding bromo-adducts are obtained. Formation of these adducts involves halogen exchange by the primary chlorocarbenoid with lithium bromide associated with methyllithium. Conjugated enones give trans α-halocyclopropanic
Baseninduzierte ringöffnung von 1,3-dioxolanen: ein neuer weg zu dienolethern
作者:K. Steinbeck、B. Osterwinter
DOI:10.1016/s0040-4039(00)92761-8
日期:1980.1
Cyclic acetals of β,γ-unsaturated carbonyl compounds may be deprotonated by NaH/DMSO. The resulting anions are unstable and give ring opening reactions to dienol ethers.