Diarylborinic acids with electron-withdrawing substituents at their aryl groups are efficient Lewis acid catalysts for Mukaiyama aldol condensation and selective dehydration of anti-aldols to α,β-enones in the presence of syn-aldols. The Lewis acidities of diarylborinic acids are much higher than those of the corresponding arylboronic acids.
芳基上带有吸电子取代基的二芳基
硼酸是高效的
路易斯酸催化剂,用于 Mukaiyama 羟醛缩合以及在顺式羟醛存在下选择性脱
水为 α,β-烯酮。二芳基
硼酸的
路易斯酸度远高于相应的芳基
硼酸。