Boron and metal alkyl initiators of free-radical polymerizations

3 Boron and Metal Alkyl Initiators of Free-Radical Polymerizations 

These initiators were originally reported a long time ago [27-29], Oxygen plays an important role in the reactions [30,31]. It reacts with the alkyl boride under mUd cmiditions to form peroxides [32,33]  

Initiating radicals apparently come from reactions of these peroxides with other molecules of boron alkyls [34, 35]. One postulated reaction mechanism can be illustrated as follows [35]  

Catalytic action of oxygen was observed with various organometallic compounds [35]. One example is dialkylzinc [37] that probably forms an active peroxide [38]. The same is also true of diaUcylcadmium and of triethylaluminum [38]. Peroxide formation is believed to be an important step in all these initiations. Initiating radicals, however, do not appear to be produced from mere decompositions of these peroxides [35]. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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