Pn. Gaponik et al., SYNTHESIS OF 1,4,5-TRISUBSTITUTED AND 1,3 ,5-TRISUBSTITUTED TETRAZOLIUM SALTS BY ALKYLATION OF 5-MONOSUBSTITUTED TETRAZOLES WITH DIMETHYLSULFATE, Doklady Akademii nauk BSSR, 41(5), 1997, pp. 66-68
1,3,5- and 1,4,5-trisubstituted tetrazolium salts can be easily synthe
sized by alkylation of 5-monosubstituted tetrazoles with dimethylsulfa
te. The obtained isomer ratio depends essentially on the nature of the
substituent at position 5 of the tetrazole ring.