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

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.

1. customThe residual quantity of hydrogen chloride in the reaction mixture was removed in a water-jet vacuum at 150° C
2. distillationThe residue was distilled under reduced pressure

ORDレコード

ord-d78f1698f1174c1c952caee3554ced35

出典データセット

uspto-grants-1977_08

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04045480