91788-25-9Relevant academic research and scientific papers
PYRYLIUM-MEDIATED TRANSFORMATIONS OF NATURAL PRODUCTS. PART 3. SYNTHESIS OF WATER-SOLUBLE PYRYLIUM SALTS AND THEIR PREPARATIVE REACTIONS WITH AMINES
Katritzky, Alan R.,Yang, Yu-Kun,Gabrielsen, Bjarne,Marquet, Jorge
, p. 857 - 866 (2007/10/02)
A series of water-soluble pyrylium salts and zwitterions has been prepared containing two or three carboxylic or sulphonic acid groups.These pyrylium salts react in aqueous solution with ammonia to give the corresponding pyridines and with n-butylamine, benzylamine, and ω-amino groups of lysine to give the corresponding pyridinium systems, usually as betaines.The pyridinium betainess (m.p > 300 deg C) show characteristic 13C n.m.r. spectra which have been nearly fully assigned.
PYRYLIUM-MEDIATED TRANSFORMATION OF NATURAL PRODUCTS. PART 4. REACTIONS OF WATER-SOLUBLE PYRYLIUM SALTS WITH WATER AND WITH AMINES
Katritzky, Alan R.,Leahy, David E.
, p. 867 - 874 (2007/10/02)
Pyrylium cation equilibria and kinetics in aqueous solution have been measured and compared with existing data.Competing reactions of pyrylium cations with amines, water molecules, and hydroxide ions have been elucidated and rationalised.Conditions for maximising yields of pyrylium cations from pyrylium salts and amines in aqueous media have been deduced.
