Patent ID: 8629279

Claim:
A process for manufacturing a compound of formula (I) wherein Z is hydrogen or halogen; Z 1 is hydrogen, halogen, cyano or nitro and R 1 , R 2 are independently C 1 -C 10 -alkyl, comprising (i) reacting a compound of formula (II), with a compound of formula (III) R 3 —O—N═O (III) wherein R 3 is C 1 -C 8 -alkyl, in the presence of an alkali metal or alkaline earth metal alcoholates or carbonates in a polar aprotic solvent at a temperature of from −45 to 40° C., to obtain a compound of formula (IV) and (ii) reacting the compound of formula (IV) with an aliphatic C 1 -C 10 -aldehyde in the presence of an acid at a temperature in the range of from 0 to 100° C. to afford the compound of formula (I).