Compounds of the formula: ##STR1## where R.sup.1 and R.sup.2 are various substituents and X is a bridge having a chain of 3 atoms, including N, are made by internal Diels-Alder reaction of alkynyl-substituted anthracenes. The compounds are useful as inhibitors of free radical vinyl polymerization.
式子为##STR1##的化合物,其中R.sup.1和R.sup.2是不同的取代基,X是具有3个原子的链的桥,其中包括N,通过炔基取代的
蒽烯的内部Diels-Alder反应制备而成。这些化合物可用作自由基
乙烯聚合的
抑制剂。