Exhaustive chlorination of phenol and some substituted phenols in acetic acid yielded chlorinated cyclohexenone derivatives. 3,5-Dimethylphenol gave a chlorinated cyclohexadienone. The structures of these compounds were elucidated mainly by IR, UV and NMR spectroscopy. A simple reaction mechanism is proposed.
Curable compositions used in circuit boards, structural composite, encapsulating resins, and the like, comprise at least one of a cyanate ester and a cyanate ester prepolymer, a cyanate ester-free aryloxytriazine, and a curing catalyst.