Control in NMP is achieved with dynamic equilibration between dormant
alkoxyamines and actively propagating radicals (Scheme 2). In order to effectively
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150 VIVEK MISHRA AND RAJESH KUMAR
mediate polymerization, TEMPO (and other stable free radicals) should react neither with
itself nor with monomer to initiate the growth of new chains, and it should not participate
in side reactions such as the abstraction of ȕ-H atoms. These persistent radicals should
also be relatively stable, although their slow decomposition may help maintain
appropriate polymerization rates.