An aluminum catalyst is obtained by reacting at least one compound of a specific alkylaluminum compound and a specific hydridoaluminum compound with a specific hydroxy compound. The specific hydroxyl compound is a specific 2-cycloalkyl-6-arylphenol or a specific di(2-cycloalkyl-6-arylphenol). A method for producing isopulegol or optically active isopulegol includes selectively cyclizing citronellal using the aluminum catalyst.
通过将特定的烷基铝化合物和特定的
氢化铝化合物至少与一种特定的羟基化合物反应,可以获得铝催化剂。特定的羟基化合物是特定的2-环烷基-6-芳基
酚或特定的二(2-环烷基-6-芳基
酚)。使用铝催化剂有选择地使
柠檬醛环化,从而生产异莰醇或光学活性异莰醇的方法。