United States Patent Office Patented Aug
3,830,819 United States Patent Office Patented Aug. 20, 1974 2 The invention provides a process for the purification of l-dihydrocodeine containing as impurities 1-dihydrothebai 3,830,819 MANUFACTURE OF l-DHYDROCODENE none and or 1-dihydrothebainol, which comprises treating Edward Leon Grew and David Jackson Powles, Edin the impure 1-dihydrocodeine to remove said impurities burgh, Scotland, assignors to MacFarlan Smith Limited, therefrom by either extraction with an aqueous alkali or Edinburgh, Scotland 5 by passage of the material through an anion exchange No Drawing. Fied Feb. 22, 1972, Ser. No. 228,367 resin of a quaternary ammonium type in the hydroxide Claims priority, application Great Britain, Feb. 22, 1971, form whereby the proportion of said impurities is reduced. 5,081/71 The crude 1-dihydrocodeine may be one prepared by Int, C. C07d 43/28 the catalytic hydrogenation of 1-dihydrocodeinone and ac U.S. C. 260-285 3 Claims 0. cording to a feature of the invention, there is therefore provided a process for the preparation of a purified 1-di ABSTRACT OF THE DESCLOSURE hydrocodeine which comprises the steps of A process for the preparation of a purified 1-dihydro (a) catalytically hydrogenating 1-dihydrocodeinone in a codeine which comprises the steps of: 5 liquid medium using a platinum oxide or supported (a) catalytically hydrogenating 1-dihydrocodeinone in a platinum metal catalyst to produce a solution of crude liquid medium using a catalyst selected from the group l-dihydrocodeine, consisting of platinum oxide and supported platinum (b) removing the catalyst from the solution, and metal to produce a solution of crude 1-dihydrocodeine, (c) treating the solution for the recovery of a purified (b) removing the catalyst from the solution, and 20 1-dihydrocodeine having a reduced content of l-dihy (c) treating the solution for recovery of a purified 1-di drothebainone and/or 1-dihydrothebainol.
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