Structural Properties of Silyl Radicals

Chatgilialoglu, C. (1995) Structural and Chemical Properties of Silyl Radicals, Chem. Rev. 95, 1229-1251. 

Chatgilialoglu C (1995) Structural and chemical properties of silyl radicals. Chem Rev... 

Values of a(a-29Si) for radicals 6-10 fall in the range 5.56-6.28 mT (Table 1) and are consistent with these radicals being the most planar silyl radicals reported to date. In addition, the steric and electronic properties of the substituents on silicon in structures 6-10 provide for highly persistent silyl radicals. Half-lives of 3 h, 1 day, 1.5 months, 5 days and 1 day at 15 °C have been measured for 6-10, respectively11. 

Structure on hydrogel properties of 2-hydroxyethyl acrylate determined. " Polymers bearing tertiary amino groups have been synthesised and their fluorescence spectra found to be significantly quenched while maleic anhydride " and cyclododecanones have been found to be effective initiators of the photopolymerisation of styrene. Poly(methylphenylsilane) is also an effective photoinitiator for styrenes and acrylates via a photolytic process to give silyl radicals. Iron oxalate is also an effective photo initiator for acrylate monomers while a theoretical description of the kinetics of free radical dye-initiated polymerisation via an electron transfer process has been proposed. Using the Marcus theory it has been shown that the rate of electron transfer can affect the rate of initiation. 

In Table 1 are given the structures and properties of some of the bis(silyl-pinacolate)s prepared during the course of this work, along with their half-lives for dissociation. The half-lives were determined spectrophotometri-cally using p-chloranil as a radical trap. ... 

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