The synthesis of titanium cyclopentenediolates by the double carbonylation of titanacyclobutane complexes is reported, a process known as the Bercaw carbonylation. The reaction is general for a range of titanacyclobutanes prepared by free radical alkylation of allyltitanium(III) precursors. Titanacyclobutane formation and carbonylation can be conducted in one pot without the isolation of sensitive intermediates. Subsequent conversion to lithium cyclopentenediolates and cyclopentane-1,2-diones provides access to a range of synthetically valuable organic products.
据报道,通过
环丁烷钛络合物的双羰基化合成
环戊烯二醇
钛,这一过程称为 Bercaw 羰基化。该反应对于通过烯丙基
钛(III)前体的自由基烷基化制备的一系列
环丁烷钛是通用的。
环丁烷的形成和羰基化可以一锅进行,无需分离敏感中间体。随后转化为
环戊烯二醇
锂和
环戊烷-1,2-二酮,从而获得一系列具有合成价值的有机产品。