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Methyl pheophorbide-a (MPa) was used as starting material. The coupling reaction of MPa with diazobenzene hydrochloride, hydrobromide and sulfate was carried out to give traces of expected product, while major products were 20-halogenated and nitroso-substituted chlorins. Zinc methyl pyropheophorbide-a reacted with 3-N,N-dimethylacrolein to give Vilsmeier product. The bromination of pyropheophorbide-d with N-bromosuccinimide (NBS) formed single 20-brominated product, the vinyl group of whichdoi:10.6023/cjoc1201202 fatcat:ufiivtuplnf75exngjkputnkru