221696-16-8Relevant articles and documents
Benzotriazole-Mediated 4-Position Derivatization of 2,6-Diarylpyrylium Cations by Electrophiles
Katritzky, Alan R.,Du, Weihong,Denisenko, Sergey N.,Czerney, Peter,Steel, Peter J.
, p. 152 - 158 (1999)
2,6-Diaryl-4H-(benzotriazolyl)pyrans (7a-c) on treatment with n-butyllithium undergo smooth lithiation at the position α to the benzotriazolyl moiety. In contrast to fused and bridged pyranyl derivatives, these pyranyl anions react with electrophiles by t