A novel method for the preparation of mixed diesters of phosphoric acid has been investigated. It was found that mixed diesters of phosphoric acid were prepared by the reaction of alkyl 2-chloromethyl-4-nitrophenyl hydrogen phosphates with alcohols in dry pyridine. On the other hand, these diesters were also obtained from dialkyl 2-chloromethyl-4-nitrophenyl phosphates on hydrolysis under mild conditions. By using both of these methods, analytically pure samples of mixed diesters of phosphoric acid could be obtained in high yields.
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Mushika et al. (1971) studied this question.
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