Asymmetric cyclization of 4-aryl-4-pentenals by using a cationic [Rh((R)-BINAP)]ClO4 afforded (3R)-3-substituted cyclopentanones; on the other hand, the cyclization of 4-pentenals bearing ortho-halogeno phenyl groups afforded the opposite (3S)-ones.
使用阳离子[Rh((R)-BINAP)]ClO4对4-芳基-
4-戊烯醛的不对称环化反应生成了(3R)-3-取代的
环戊酮;另一方面,带有邻卤素苯基的
4-戊烯醛环化反应则生成了相反的(3S)-产物。