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- W2017990944 abstract "Stable crystalline dibenzyl a-oxobilane-1′,8′-dicarboxylates have been prepared from 5-benzyloxycarbonyl-5′-chloromethylpyrroketones and 5′-benzyloxycarbonylpyrromethane-5-carboxylic acids. The internuclear carbonyl group can be removed by reduction with diborane, and then hydrogenolysis of the benzyloxycarbonyl groups and dehydrogenation with t-butyl hypochlorite leads to b-bilene-1′,8′-dicarboxylic acids, which are cyclised with methyl orthoformate and trichloroacetic acid and aerially oxidised to porphyrins. The examples of mesoporphyrin IX dimethyl ester, 4-ethyl-6,7-dimethoxycarbonylethyl-1,2,3,5,8-pentamethyl-porphin, and 2-ethyl-6,7-dimethoxycarbonylethyl-1,3,4,5,8-pentamethyl-porphin demonstrate that the synthesis is rational." @default.
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- W2017990944 date "1967-01-01" @default.
- W2017990944 modified "2023-10-14" @default.
- W2017990944 title "Pyrroles and related compounds. Part XII. Stepwise synthesis of porphyrins through a-oxo-bilanes" @default.
- W2017990944 doi "https://doi.org/10.1039/j39670002045" @default.
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