One device turns into its mono- GARDINTRA dwarfs of AER UPPVINDBAR, one a week and a half hanging body.

摘要

It is pure, the preparation of halogen-free o-phthalaldehyde (OPA) be related to hydrolyze in the tetrahalo-o-xylene of 155-160 [degree] C and in the presence of a phase transfer catalyst pressure be 2-5 bars in the case where to form phthalic aldehyde, which is switched to reflux temperature into corresponding dialkoxyphthalane with then in an acid alcoholic solution at 0 point, and an acetal cleavage is by 1.5-7, to form high-purity, the acidolysis of a pH of halogen-free o-phthalaldehyde influences.