Diphenyl phosphorochlorldate

Diphenyl phosphorazldate is prepared by the action of sodium azide with diphenyl phosphorochlorldate (preceding procedure, this volume).3 It 1s also available from Aldrich Chemical Co. and was used after purification by distillation at 134-136°C (0.2 mm). WARNING Diphenyl phosphorazidate may produce explosive hydrogen azide when it 1s 1n contact with moisture for a long time. When diphenyl phosphorazidate, which has been stored for a long time, is used, 1t should be washed with saturated aqueous sodium bicarbonate and dried over sodium sulfate before distillation. 

K. D. Collins (28), whereby diphenyl (carbomethoxymethyl) phosphate was prepared from the reaction of diphenyl phosphorochlorldate with methyl glycolate in the presence of a tertiary amine, such as pyridine or lutldlne. This is shown in Eq. 3. 

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