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From purpurin-18 methyl ester the electrophilic addition of C(3)-vinyl group and electrophilic substitution at 20-meso-position produced regioselectively corresponding chloro-substituted or bromo-substituted products. The 3-pyrazolinylpurpurin-18 ester, obtained by 1,3-dipolar cycloaddition of purpurin-18 with diazomethane, reacted with N-bromosuccinimide (NCS) or N-chlorosuccinimide (NBS) to generate halogenated pyrazolinyl-substituted chlorins. After pyrolysis the halogenations ofdoi:10.6023/cjoc1105231 fatcat:q46siaqcqngd5iing7tvkzhj5m