Rajoharison, Harivelo G.; Roussel, Christian, Bulletin de la Societe Chimique de France, 1986, # 2, p. 307 - 313
作者:Rajoharison, Harivelo G.、Roussel, Christian
DOI:——
日期:——
Process for preparing pyrylium salts
申请人:Eastman Kodak Company
公开号:US04642359A1
公开(公告)日:1987-02-10
A process for selectively preparing isomers of polysubstituted pyrylium salts from isoolefins or isoolefin precursors comprises diacylating the isoolefin or isoolefin precursor with a carboxylic acid anhydride in the presence of an acid having a Hammett acidity function, at about 22.degree.-25.degree. C. when pure, between -10 and -5. This method is selective to obtain the most substituted isomer of pyrylium salt that can be obtained from the isoolefin or isoolefin precursor.