The alkylation of aromatic compounds with aldehydes and ketones in
 the presence of a variety of metal cation-exchanged montmorillonites
 (Mn+-mont;
 Mn+ = Zr4+,
 Al3+, Fe3+, Zn2+, H+,
 Na+) has been investigated. Al3+- and
 Zr4+-Monts are revealed to be effective as catalysts, while
 no reaction takes place with Na+-mont.
 Al3+-Mont-catalysed alkylation of phenol with several
 aldehydes produces mainly or almost solely the corresponding
 gem-bis(hydroxyphenyl)alkanes (bisphenols) in good yields, while that
 with several ketones affords selectively the corresponding alkylphenols
 in moderate to good yields. The alkylation always occurs at the carbonyl
 carbon without any skeletal rearrangement and the kind of products
 depends much on the steric hindrance of an electrophilic intermediary
 carbocation. The alkylation of anisole, veratrole and p-cresol
 proceeds well, while that of toluene, benzene, chlorobenzene and
 nitrobenzene scarcely occurs.
                                    在各种
金属阳离子交换的
蒙脱石(Mn+-mont;Mn+ = Zr4+、Al3+、Fe3+、Zn2+、H+、Na+)存在下,研究了芳香化合物与醛和酮的烷基化反应。发现Al3+和Zr4+
蒙脱石是有效的催化剂,而Na+
蒙脱石则不发生反应。由Al3+
蒙脱石催化的
苯酚与几种醛的烷基化反应主要或几乎只生成了相应的双(羟苯基)
烷烃(双
酚),产率良好;而与几种酮的烷基化反应则选择性地生成了相应的烷基
苯酚,产率适中至良好。烷基化总是发生在羰基碳上,没有骨架重排,产物的类型很大程度上取决于亲电中间体的碳正离子的空间位阻。
茴香醚、
邻苯二甲醚和
对甲酚的烷基化反应良好进行,而
甲苯、苯、
氯苯和
硝基苯的烷基化反应几乎不发生。