Novel direct reactions between trioxane and ethylene oxide were discovered,
and three novel cyclic formals were isolated and identified. These novel c
yclic compounds clarified the initiation mechanism of the copolymerization
of trioxane and ethylene oxide. This type of direct reaction is not only li
mited to the reaction between trioxane and ethylene oxide, but it was also
found to be generalized to the reaction between the cyclic formal and ethyl
ene oxide. (C) 2000 Elsevier Science Ltd. All rights reserved.