How is 2-Chloro-6-nitrobenzaldehyde (CAS: 6361-22-4) typically synthesized?

2-Chloro-6-nitrobenzaldehyde is commonly synthesized via nitration of 2-chlorobenzaldehyde followed by reduction of the nitro group. Alternatively, it can be prepared by chlorination of 6-nitrobenzaldehyde. The synthesis typically involves the use of concentrated nitric and sulfuric acids as reagents, with careful temperature control to ensure selectivity and yield.