A new sulfate acid polymorph of 1,3-dihydrobenzotriazole
摘要:
A new sulfate acid polymorph of 1,3-dihydrobenzotriazole, viz. 1,3-dihydrobenzotriazolium hydrogensulfate, C6H6N3+center dot HSO4-, differs from an existing polymorph in that the polymeric interaction between the HSO4- anions, together with different classical (D-H center dot center dot center dot A) and nonclassical (C-H center dot center dot center dot A) interactions, changes the space group.
Impure aryltriazoles such as benzotriazole and tolyltriazole that are contaminated with dark colored imputities can be purified by conversion to an aryltriazole acid salt by treatment with aqueous acid. The aryltriazole acid salt is water soluble whereas the dark colored impurities are not. The aryltriazole acid salt solution is separated from the dark colored impurities and the aryltriazole is recovered by neutralization with base.