Enolates formed from 1-phenyl-5-tetrazolyl β-ketosulfones containing a tetrasubstituted α carbon centre undergo elimination to allenes with up to four substituents at the cumulene unit when treated with a weak base (phenolate) in DMSO at room temperature. The reaction is completely regioselective for allene vs diene formation in nearly all investigated cases and it proceeds with central-to-axial chirality
室温下,在
DMSO 中用弱碱(
酚盐)处理时,由含有四取代 α 碳中心的 1-苯基-5-
四唑基 β-酮砜形成的烯醇化物会消除为在
异丙苯单元中具有最多四个取代基的
丙二烯。在几乎所有研究的案例中,该反应对
丙二烯和二烯的形成具有完全的区域选择性,并且进行中心到轴向的手性转移。