water in dichloromethane (N2); addn. of HBBr2(SMe2) at 0°C; filtration after 12 h into mixture of ice and ether (1:1); stirring for 30 min at room temperature; washing of organic phase with satd. NaCl-soln.; drying (MgSO4); removal of solvent in vac.; washing with hexane;
参考文献
Bulletin de la Societe Chimique de France, , vol. 129, p. 554 - 565