反应详情

A solution of LiOH.H2O (1.86 g, 44.2 mmol) in H2O (40 mL) was added dropwise to a suspension of 4′-Methyl-5-tetrazol-1-yl-biphenyl-3-carboxylic acid methyl ester (10 g, 34 mmol) in THF (25 mL) at 0° C. The reaction mixture was allowed to warm to room temperature and was stirred until the reaction solution turned clear. Solvent was removed under vacuum and the aqueous solution was acidified by addition of 10% HCl to pH=3. The resulting precipitate was collected and dried to afford 4′-Methyl-5-tetrazol-1-yl-biphenyl-3-carboxylic acid as white solid (8.85 g, 93%). MS (M+H)=281.

1. customSolvent was removed under vacuum
2. additionthe aqueous solution was acidified by addition of 10% HCl to pH=3
3. customThe resulting precipitate was collected
4. customdried