Process for manufacturing 5-formyl-pyridine-2,3-dicarboxylic acid esters and derivatives thereof and uses thereof in the synthesis of herbicidal imidazolinones

摘要

The invention relates to hydroxymethyl compounds of formula (VI),
wherein Z is hydrogen or halogen; and Z 1 is hydrogen, halogen, cyano or nitro;
as well as their use as intermediates in the synthesis of herbicidal imidazolinones.