| 摘要 |
PROCESS FOR PREPARING 1,2-OXA-PHOSPHOLANES of the disclosure: A process for the preparation of 2,5-dioxo-1,2-oxa-phospholanes having general formula (I) (I) wherein R1 represents an alkyl group being optionally substituted and having up to 18 carbon atome, a cycloalkyl group having up to 8 carbon atoms, an alkenyl group having up to 8 carbon atoms, an aryl group having up to 14 carbon atoms being possibly substituted by lower alkyl groups, by alkoxy groups, by halogen or by alkylated or dialkylated amino groups, or which represents an aralkyl group having up to 15 carbon atoms and being possibly substituted in the same way as the aryl group, wherein R2 stands for a lower alkyl group or hydrogen and R3 stands for a lower alkyl radical, a phenyl radical being possibly substituted by halogen or lower alkyl groups, for a benzyl radical or for hydrogen, which comprises reacting in a single reaction vessel a selected dihalogenophospine with an equimolar quantity of a selected .alpha.,.beta.-unsaturated acid and an equivalent quantity of a selected acid compound such as acetic acid,propionic acid, sulfonic acid, dimethyl-phosphinic acid, methyl-ethyl-phosphinic acid and methyl-ethyl-phosphinic acid - isobutyl ester. The process is a one-vessel reaction accomplished without the isolation and purification of intermediate products and,in addition to the primary product produces,other useful reaction products. - 1a |
