| 摘要 |
Novel 2alpha-methyl-2beta-[(1,2,3-triazol-1-yl)methyl]penam--3alpha-carboxylic acid benzhydryl ester (TMPB)-acetone crystals for use in producing 2alpha-methyl-2beta-[(1,2,3-triazol-1-yl)-methyl]penam- 3alpha-carboxylic acid 1,1-dioxide benzhydryl ester (TAZB); a process for producing TMPB-acetone crystals which comprises (A) the step of concentrating an organic solvent solution containing TMPB, (B) the step of dissolving the resultant concentrate in acetone, and (C) the step of crystallizing TMPB-acetone crystals from the acetone solution obtained; and a process for producing TAZB which comprises the step of reacting TMPB-acetone crystals with an oxidizing agent.
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