摘要:
A process for preparing 3,4-disubstituted phenylacetic acids of the formula (I) in which X is fluorine, chlorine, bromine or iodine and R is C1-C4-alkylthio, C1-C4-alkylsulfonyl or C1-C4-alkylsulfoxide, starting from a 2-halo-C1-C4-alkylthiobenzene of the formula (II) in which X is as defined above and R1 is C1-C4-alkylthio.
摘要:
An improved process for preparing o-chloromethylphenylglyoxylic esters of the formula which comprises converting a compound of the formula by reaction with magnesium into the corresponding Grignard reagent which is then reacted with a compound of the formula to give the compound of the formula which is then cleaved by reaction with a chloroformic ester of the formula CICOOR4 or by reaction with phosgene to give the compound of the formula (I), followed by the isolation of the compound of the formula (I), and also an improved process for preparing (E)-2-(2-chloromethylphenyl)-2-alkoximinoacetic esters of the formula and intermediates for their preparation.