Hydrochloric Acid → 2,4-Dimethyl-2,5-dioxo-1,2-oxa-phospholane

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Reaction Steps

86 g (1 mol) of methacrylic acid were added dropwise to 117 g (1 mol) of methyldichlorophosphine at a temperature from 40° to 45° C. The mixture was stirred for 1 hour at said temperature. Phosphinic-carboxylic acid dichloride was then decomposed with 18 ml of H2O at a temperature of from 40° to 60° C., whereby a considerable formation of hydrogen chloride occurred. The residual quantity of hydrogen chloride in the reaction mixture was removed in a water-jet vacuum at 150° C. The residue was distilled under reduced pressure. 126 g of 2,4-dimethyl-2,5-dioxo-1,2-oxa-phospholane were obtained, which corresponds to a yield of 85.1% of the theory.

Provenance & Evidence