Etude du comportement d'organometalliques (M = Zn, Mg, Li) vis a vis d'enynes conjuges
作者:D. Mesnard、L. Miginiac
DOI:10.1016/s0022-328x(00)87262-9
日期:1976.9
organometallic compounds such as allyl-zinc, -magnesium, -lithium and saturated lithium compounds are shown to readily undergo addition reactions with conjugated enynes: HCCC(R)C(R)(R), but the reactivity is reduced when the steric hindrance around the double bond is increased. With each organometallic compound used, this reaction is regioselective: 3,4 addition with organozinc compounds, 1,2 addition
Stereoselection in the chromium mediated intramolecular [2 + 2] cycloadditions of vinyl ketenes and alkenes
作者:Oak K. Kim、William D. Wulff、Weiqin Jiang、Richard G. Ball
DOI:10.1021/jo00073a001
日期:1993.10
The first study of the relative diastereoselectivity of the intramolecular [2 + 2] cycloadditions of alkenes and vinyl ketenes generated from the reactions of carbene complexes with chiral enynes is reported.