描述了烯丙基(±)-1,(±)-4和(±)-6以及富集样品(-)-1,(-)-4和(-)-6的合成。给出了由非手性盐Ag(fod)和旋光络合物(+)-Yb(hfbc)3的混合物引起的1 H NMR位移和分裂。这种分离的程度推荐该方法作为确定1,3-二取代的烯丙基烃的对映体纯度的手段。(-)-1和(-)-5的结果代表了该绝对方法的首次应用。
syntheses of the allenes (±)-1, (±)-4 and (±)-6 as well as of the enriched samples (-)-1, (-)-4 and (-)-6 are described. 1H NMR shifts and splittings induced by a mixture of the achiral salt Ag(fod) and the opticallyactive complex (+)-Yb(hfbc)3 are given. This procedure is recommended by the magnitude of such splittings as a means of determining the enantiomeric purity of 1,3-disubstituted allenic hydrocarbons
描述了烯丙基(±)-1,(±)-4和(±)-6以及富集样品(-)-1,(-)-4和(-)-6的合成。给出了由非手性盐Ag(fod)和旋光络合物(+)-Yb(hfbc)3的混合物引起的1 H NMR位移和分裂。这种分离的程度推荐该方法作为确定1,3-二取代的烯丙基烃的对映体纯度的手段。(-)-1和(-)-5的结果代表了该绝对方法的首次应用。
Mecanismes de la protonolyse des organo-chromiques issus de bromures propargyliques.
作者:Bernard Cazes、Catherine Verniere、Jacques Gore
DOI:10.1016/s0040-4039(00)87652-2
日期:1982.1
The reaction of CrCl2 with propargylic bromides leads to an allenic organo—chromic derivative protonated without rearrangement by carboxylic acids. Alcohols like methol transform this metallic to its propargylic isomer and then protonate it with rearrngement (SEi′ type mechanism).