A DNMR study of isomeric phenols obtained by ring-opening, ring-closure of 3-isopropyl-2,4,6-trimethylpyrylium salts: an approach to the regioselectivity of the ring-closure
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0096641A2
公开(公告)日:1983-12-21
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, 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.
A DNMR study of isomeric phenols obtained by ring-opening, ring-closure of 3-isopropyl-2,4,6-trimethylpyrylium salts: an approach to the regioselectivity of the ring-closure
作者:Harivelo G Rajoharison、Christian Roussel、Ulf Berg
DOI:10.1016/s0040-4039(00)81898-5
日期:1983.1
ARNAUD M.; PEDRA A.; ROUSSEL C.; METHGER J., J. ORG. CHEM., 1979, 44 NO 17, 2972-2976