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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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