C(N1C(C(OCC)=O)=NNN1)C1C=CC=CC=1.[CH2:18]([N:25]1[N:29]=[N:28][C:27]([C:30]([O:32]CC)=[O:31])=[N:26]1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.S1(CCCC1)(=O)=O.[OH-].[K+:43]>C(O)C.O>[CH2:18]([N:25]1[N:29]=[N:28][C:27]([C:30]([O-:32])=[O:31])=[N:26]1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.[K+:43]A mixture of ethyl 1-benzyl-2H-tetrazole-5-carboxylate and ethyl 2-benzyl-2H-tetrazole-5-carboxylate (7 g; prepared as described below and still containing a little sulpholane) was dissolved in hot ethanol (100 ml) and the hot solution was treated with a solution of potassium hydroxide (2.7 g) in water (8 ml). The white solid which separated was filtered off from the hot solution and washed with ethanol to give potassium 2-benzyl-2H-tetrazole-5-carboxylate (4.64 g), m.p. 264°-267° C. [The pure salt, obtained as a hemihydrate after recrystallisation from water, had a melting point of 272°-273° C.]
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