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The structure of bacteriochlorophyll has been nearly determined by Fischer et al. and Golden et al. as shown by formula I. The main route of synthesizing this compound lies in the synthesis of bacteriooxochloroporphyrine e6 which is produced by dehydrogenating bacterio-chlorine e6 (II) or both A and B ring at 3, 4 and 7, 8 positions. Because since in the study of Fischer et al. 7 and 8 positions of porphyrine were hydrogenated, the similar way of hydrogenation at 3 and 4 position may be expected, and then the formation of the attached keto ring of C and the binding of phytol and Mg were successfully performed.

SYNTHESIS OF 4, 5, 3', 5' -TETRAMETHYL-3-ACETYL- 4' -ETHYLPYROMETHENE HYDROBROMIDE