Fig. 3From: Butadiene sulfone as ‘volatile’, recyclable dipolar, aprotic solvent for conducting substitution and cycloaddition reactionsPurification scheme for the isolation of 1-benzyl-5-p-toluenesulfonyl tetrazole (2). The crude product mixture obtained after the cheletropic removal of the butadiene sulfone is washed with a 4:1 v:v mixture of methanol:ethyl ether and then filtered. The product residue is then dried to afford a cream-colored productBack to article page