17659-13-1Relevant academic research and scientific papers
The Synthesis and Reactions of Sterically Constrained Pyrylium and Pyridinium Salts
Katritzky, Alan R.,Thind, Sukhpal S.
, p. 1895 - 1900 (2007/10/02)
Efficient syntheses are developed for several pyrylium cations with substitution patterns more sterically demanding than 2,4,6-triphenyl and these are examined as reagents for the conversion of primary amino into a leaving group.The 2-mesityl-4,6-diphenyl derivative did not react smoothly with amines.The 2,6-di-t-butyl-4-phenyl-pyrylium cation gave the corresponding pyridinium derivatives, but they resisted nucleophilic attack. 2-t-Butyl-4,6-diphenylpyridinium cations suffer nucleophilic attack with about the same ease as the 2,4,6-triphenyl analogues.Dihydrobenzopyrylium (6) and tetrahydrodibenzoxanthylium cations (7) gave pyridinium cations which underwent much easier nucleophilic attack: thus they alkylate xanthate anion in ethanol solution and acetate anion in acetic acid.
