Catalysts of the type [Rh(chiral diphosphine)] + convert 4-substituted 4-pentenals into the corresponding 3-substituted cyclopentanones with generally high turnover numbers and frequencies at 25 o C. The enantioselectivities of various substituted 4-pentenals with two chiral diphosphines have been explored. It was found that with the binap catalyst, almost complete enantioselectivity is observed for
[Rh(手性
二膦)] + 类型的催化剂在 25 o C 下将 4-取代的
4-戊烯醛转化为相应的 3-取代的
环戊酮,其转换数和频率通常很高。 具有两个手性
二膦的各种取代的
4-戊烯醛的对映选择性已被探索。发现使用 binap 催化剂,对于带有 4-取代叔取代基的
4-戊烯醛底物和酯基,观察到几乎完全的对映选择性。酮取代基具有非常高的对映选择性