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A methyl group at the 2-position of methyl mesopyropheophorbide-a was transformed to the 2-formyl group to give methyl mesopyropheophorbide-f, one of the chlorophyll-f analogs. The 2-formylation moved the redmost electronic absorption band in a solution to a longer wavelength and the bathochromic shift was comparable to that by the 3-formylation. Zinc complex of the synthetic compound in solutions...
Regioisomerically pure 7/8,13 1 -dioxo-bacteriochlorins prepared by modification of naturally occurring chlorophyll-a were reacted with Lawesson's reagent in toluene at room temperature or reflux to give 7/8-oxo-13 1 -thioxo- or 7/8,13 1 -dithioxo-products, respectively. The 13 1 -thioxo moiety of the latter products was selectively transformed to the oxo group to afford...
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