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process for the production of 2 - hydroxy - 2 - or hydroxyalkylmethacrylaten alkylacrylaten
process for the production of 2 - hydroxy - 2 - or hydroxyalkylmethacrylaten alkylacrylaten
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机译：的生产2-羟基-2-甲基丙烯酸羟烷基酯或甲基丙烯酸羟烷基酯的方法
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摘要
2-Hydroxyalkyl acrylates or methacrylates are prepared by reacting an alkylene oxide with acrylic or methacrylic acid respectively in the liquid phase in the presence of a quaternary pyridinium salt catalyst. Ethylene and propylene oxides may be used and the pyridinium compounds may be N-methyl, N-ethyl, and N-cetyl pyridinium salts and bi-pyridylium salts with anions such as halides, sulphate, bi-sulphate or sulphonate. Inhibitors such as hydroquinone or para-methoxyphenol may be present. In examples, N-ethyl pyridinium bromide, N-methyl pyridinium chloride, N-methyl-4-methyl pyridinium iodide, N-benzyl pyridinium chloride, N-methyl-2-chloropyridinium iodide, N,N1-dimethyl-4,41-bipyridylium dichloride, N-cetylpyridinium chloride and the N-methylpyridinium salt of toluene-p-sulphonic acid are used as catalysts.
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