Electrolytic reduction of dihydrobenzopyranoxanthenones
US4082627A · kind A · utility
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14Claims
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Key dates
| Filing date | May 26, 1977 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | May 26, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B3/25
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Dihydrobenzopyranoxanthenones of the formula ##STR1## are electrolytically reduced to their corresponding hexahydrobenzopyranoxanthenones at a mercury cathode in the presence of a proton source and in the presence of an electrolyte selected from the group consisting of alkali metal salts, quaternary ammonium salts having a total of about 10 to about 28 carbon atoms in the cation moiety, and tertiary amine salts having a total of about 7 to about 21 carbon atoms in the cation moiety.
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