Neither Donor nor Acceptor is Polymerizable

Bond is Not Formed. The electron donor/acceptor combinations afford initiating systems for vinyl polymerizations. The notable combinations consist of a 

Of the two kinds of radicals, the amino radicals are responsible for the initiation, while the semipinacol radical plays a role in the primary radical termination [1]. 

Bond-Formation is Possible. Cycloaddition is the most popular reaction studied. For example, mixed cyclodimers can be formed by irradiation of 1 1 mixtures of two different anthracene derivatives [2, 3]  

In some other reactions, only one bond is formed. Naphthalene reacts with pyrrole on irradiation, forming dihydronaphthalenes [4]. 

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