1) Metachlorobenzaldehyde is an intermediate of indole, a plant growth regulator. To

Used as medicine and dye intermediates. Mitejing, a pesticide produced with o-chlorobenzaldehyde, can control mites on dry crops and fruit trees. O-chlorobenzaldehyde oximation can get o-chlorobenzoxime, and further chlorination can get o-chlorobenzoxime, both of which are pharmaceutical intermediates. In medicine, it is mainly used to synthesize Cloxacillin (Cloxacillin). To

2) Brightener for zinc plating.