Lewis acids like BF3·OEt2, TiCl4, ZnCl2·OEt2, ZnI2, and InCl3 in liquid SO2 as a solvent at low temperatures have been found to be highly efficient in epoxyolefin cyclizations with pyrones as terminators.
人们发现,
路易斯酸(如
BF3·OEt2、TiCl4、ZnCl2·OEt2、ZnI2 和 InCl3)在低温下以液态 SO2 为溶剂,在以
吡喃酮为
终止剂的环氧烯烃环化中非常有效。