Patent ID: 7663001

Claim:
A process for preparing a compound of formula XV in which X is NO 2 or S(O) n R y , R x is halogen, carboxyl, carboxamide, N-alkyl-carboxamide, N,N-dialkylcarboxamide, phenyl, C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy or C 1 -C 6 -alkylthio, R y is C 1 -C 6 -alkyl; m is 1, 2, 3 or 4, and n is 2, or a corresponding aldehyde, nitrile or nitrile oxide, which comprises reacting a compound of the formula XVI in which X and (R x ) m are as defined above, with an organic nitrite of the formula R—O—NO, where R is an aliphatic or aromatic radical, in the presence of a base, to obtain the compound of the formula XV, and optionally converting the oxime group —CH═NOH in formula XV into an aldehyde moiety (—CHO), a nitrile (—CN) or a nitrile oxide (—CHO), wherein the reaction is carried out at a temperature below −20° C. in the presence of a dipolar aprotic solvent.