sentences:  Besides all the applications mentioned above, the BTA can be used as antifreezes, heating and cooling systems, hydraulic fluids and vapor phase inhibitors as well.Biphenylene and benzyne can be conveniently prepared from benzotriazole by "N"-amination with hydroxylamine-"O"-sulfonic acid.The major product, 1-aminobenzotriazole, forms benzyne in an almost quantitative yield by oxidation with lead(IV) acetate, which rapidly dimerises to biphenylene in good yields.