The salts used are sodium chloride, sodium acetate, sodium n-butyrate, sodium benzoate, sodium benzene sulphonate, tetramethylammonium bromide, tetraethylammonium bromide, and piperidine hydrochloride, most of which possess one kind of large ion. 所用的盐有氯化钠、乙酸钠、丁酸钠、苯甲酸纳、苯磺酸钠、溴化四甲基铵、溴化四乙基铵和六氢呲啶盐酸盐。
In the presence of the phase transfer catalysts such as tetramethylammonium bromide, tetraethylammonium bromide or polyethylene glycol ( MW 400 and 6,000), lithium hydroxide is the best alkali among lithium hydroxide, sodium hydroxide and potassium hydroxide. 研究表明在溴化四甲基铵、溴化四乙基铵、聚乙二醇(分子量为6000)和聚乙二醇(分子量为400)相转移催化体系中,氢氧化锂最好,氢氧化钾次之,氢氧化钠最次。