Process for preparing 1,2-oxa-phospholanes

Details Process for preparing 1,2-oxa-phospholanes Process for preparing 1,2-oxa-phospholanes

C - Chemistry, Metallurgy

07

F

260/457.2

C07F 9/40 (2006.01) C07F 9/6571 (2006.01) C08K 5/5313 (2006.01)

Patent

CA 1063130

PROCESS FOR PREPARING 1,2-OXA-PHOSPHOLANES ABSTRACT OF THE DISCLOSURE Preparation of 2,5-dioxo-1,2-oxa-phospholanes of the formula (I) Image (I) wherein R1 represents an optionally substituted alkyl having up to 18 carbon atoms, a cycloalkyl radical having up to 8 carbon atoms, an alkylene radical having up to 8 carbon atoms, an aryl radical having up to 14 carbon atoms which may be sub- stituted by lower alkyl groups, lower alkoxy groups, halogen or by amino groups alkylated or dialkylated by lower alkyl groups, or an aralkyl radical having up to 15 carbon atoms which may be substituted in an analogous manner as the aryl radical, R2 represents a lower alkyl radical or hydrogen and R3 represents an alkyl radical having up to 6 carbon atoms, a phenyl radical which may be substituted by halogen or by lower alkyl groups, a benzyl radical or hydrogen, by reacting 2- halogenoformylethylphosphonic acid halides of the formula (II) Image (II) wherein R1, R2 and R3 are defined as in formula (I) and X represents chlorine or bromine, with approximately an equimolar quantitiy of water or one phosphinic - carboxylic acid of the formula (II), wherein both radicals X represent OH-groups.

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