Process for preparing trihydrocarbyl (2,5- dihydroxyphenyl)...

Details Process for preparing trihydrocarbyl (2,5- dihydroxyphenyl)... Process for preparing trihydrocarbyl (2,5- dihydroxyphenyl)...

C - Chemistry, Metallurgy

07

F

260/613.3

C07F 9/54 (2006.01)

Patent

CA 1082741

ABSTRACT The invention is directed to a process for preparing tri-substituted (2,5-dihydroxyphenyl)phos- phonium salts of the formula Image The process is characterized by reacting together (a) a phosphine of the formula R1R2R3P wherein R1, R2 and R3 are each independently hydrocarbyl or inertly-sub- stituted hydrocarbyl groups of from 1 to 20 carbon atoms; (b) para-benzoquinone; and (c) a protic acid of the formula H?A?, wherein A? is an inert anion, in a lower alkanol of from 1 to 4 carbon atoms, 1,2-ethylene glycol, 1,2-propylene glycol, diethylene glycol, di- propylene glycol, triethylene glycol, tripropylene glycol, a lower alkyl (C1-C4) ether of said glycols, or a mixture thereof. The reaction is preferably carried out in methanol. A precatalyzed epoxy resin is obtained by adding a methanol solution of the phosphonium salt to a liquid epoxy resin.

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