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A solution of 2.76 g of N-(2'-cyanobiphenyl-4-ylmethyl)-N-propyl-isophthalic acid monoamide and 8.68 g of tributyltin azide in 75 ml of xylene is heated under reflux for 2 hours. When cool, the mixture is stirred with 50 ml of 2N sodium hydroxide solution at room temperature for 1 hour, and is then acidified and extracted with 100 ml and twice with 50 ml of CH2Cl2. After customary treatment, the combined dichloromethane phases yield a crude product that, after chromatography on silica gel 60 (40-63 μm) using CH2Cl2 /CH3OH (9:1) as eluant, yields N-propyl-N-[2'-(1H-tetrazol-5-yl)-biphenyl-4-ylmethyl]-isophthalic acid monoamide that has an Rf value of 0.10 [CH2Cl2 /CH3OH (4:1)]. ##STR10##

1. temperatureunder reflux for 2 hours
2. temperatureWhen cool
3. extractionextracted with 100 ml and twice with 50 ml of CH2Cl2
4. customAfter customary treatment, the combined dichloromethane phases yield a crude product that