Process for the preparation of (thio)phosphoric (phosphonic) acid esters

Claim 1

A process for the preparation of a (thio)-phosphoric (phosphonic) acid ester of the formula ##EQU4## in which R 1 is a straight-chain or branched alkyl, alkylmercapto or alkoxy group with up to 8 carbon atoms, R 2 is alkyl with 1 to 8 carbon atoms optionally substituted by chlorine, R 4 and R 6 each individually is hydrogen, C 1 -C 4 -alkyl or halogen. X, y and Z each individually is oxygen or sulfur, Hal is chlorine or bromine, and R 3 and R 5 each individually is hydrogen; halogen; a C 1 -C 18 -alkyl, acyloxy or C 2 -C 12 -alkenyl radical which can be substituted by halogen, an acyloxy or alkoxy group with up to 18 carbon atoms, isocyano, dichloroisocyano, chlorocarbonyl, cyano, chlorosulfonyl, a carbalkoxy group with up to 8 carbon atoms in the alkoxy moiety, or an optionally substituted carbamino group with up to 12 carbon atoms; phenyl; halogen-substituted phenyl; or C 1 -C 4 -alkyl-substituted phenyl; or R 3 and R 5 together form a 4- to 12-membered aliphatic or heterocyclic ring, or R 5 may alternatively be chlorocarbonyl; cyano; a carbalkoxy or an optionally substituted carbamino group with up to 9 carbon atoms; an alkylcarbonyl, alkylsulfonyl, arylcarbonyl or arylsulfonyl group, each with up to 7 carbon atoms; or an aldehyde group, which comprises reacting at a temperature of about -50°C to 120°C an olefin of the formula ##EQU5## in a one-step process with a halogenating agent and at least an equivalent amount of a (thio)phosphoric (phosphonic) acid ester of the formula ##EQU6##