C[C:2]1[CH:3]=[CH:4][C:5]([S:8]([OH:11])(=[O:10])=[O:9])=[CH:6][CH:7]=1.[C:12]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[OH:31][C:32]([C:34]1[C:35](=[CH:37][CH:38]=[C:39]([CH:44]=1)S(O)(=O)=O)[OH:36])=[O:33]>CO>[S:8]([O:36][C:35]1[C:34](=[CH:44][CH:39]=[CH:38][CH:37]=1)[C:32]([O-:31])=[O:33])([OH:11])(=[O:10])=[O:9].[C:6]1([CH3:12])[C:5]([S:8]([O-:11])(=[O:9])=[O:10])=[CH:4][CH:3]=[CH:2][CH:7]=1In a preferred embodiment, a mixture containing an 11a-halo-6-deoxy-6-demethyl-6-methylenetetracycline, preferably the p-toluene sulfonate of 11a-chloro methacycline; hydridotetrakis(triphenylphosphine) rhodium (I); and a tertiary phosphine, preferably triphenylphosphine, in methanol is subjected to agitation in a stainless steel autoclave, and hydrogenated at about 50° to 90° C. under a pressure between about 4 and 12 kg/cm2, prior to the termination of the reaction. Sulfosalicylic acid is added and the reaction mixture is cooled to about 10° C. for 2-4 hours. The alpha-6-deoxy-5-oxytetracyline sulfosalicylate, preferably doxycyline sulfosalicylate (or toluene sulfonate) thus obtained is filtered and washed with methanol.
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