2-Methyl-3-phenyl-3- -2-propyl radical

For the 2-methyl-3-phenyl-3-(diphenylphosphatoxy)-2-propyl radical rate constants were obtained for the complete set of processes, including fragmentation to the contact ion pair, collapse of the contact ion pair to the rearranged... 

Isomeric enolate ions can be formed from unsymmetric dialkyl ketones, and the distribution of the two possible arylation products is mainly determined by the equilibrium concentration of the various possible enolate ions. However, the selectivity also depends on the structure of the attacking radical. Reactions with the enolate ions from 2-butanone afford arylation preferentially at the more substituted a carbon to render about twice as much 3-phenyl-2-butanone as 1-phenyl-2-butanone [68,69] however, in the reaction with the anion derived from /-propyl methyl ketone, the 1-phenyl derivative is predominantly formed [68]. When there is a substituent ortho- to the leaving group, the attack at the primary a carbon is enhanced [69,70]. 

For example, mesoionic 2-[2-(isopropenylcarbonyloxy)ethylthio]-l-methyl-6-oxo-3-phenyl-5-propyl-l,6-dihydro-pyrimidin-3-ium-4-olate (11) (34) was stirred in equimolar amoimt with a solution of RAMEB for 5 days at ambient temperature. The 2 1 hosfc-guest complex 11/RAMEB was isolated in 71% srield relative to the guest monomer. The water solubility of complex was about 800 mg in 1-ml water at ambient temperature. The radical polymerization of RAMEB-complexed monomer was carried out with 3.3 mol% of redox initiator potassiiun peroxodisul-fate and sodium hydrogensulfite. According to the results of the gel-permeation chromatography (GPC) obtained for the polymer prepared from the imcomplexed monomer, 85% of 11 was unreacted after 1 h. Additionally, the molecular weight distribution of the polymer synthesized without RAMEB is bimodal with = 11,000 g/mol and polydispersity of 4.5 (35). 

Methyl-l-phenyl-2-propyl hydroperoxide (MPPH) was used as a probe capable of distinguishing between free alkoxyl radical chemistry and radical-free (enzyme mimetic) chemistry.Miyake et al studied the reaction of [Fe 20(TPA)2(H20)2] with MPPH and showed that MPPH breaks down by 0-0 bond homolysis, leading to the formation of the benzyl radical and a high-valent Fe =0 species (Scheme 3). The latter oxidizes exogenous substrates such as thioanisole, cyclohexanol, and cyclooctene. 

The polymerization of optically active acetals and vinyl acrylamides has been described but only in a few cases. Poly-[(-)-7V-propyl-7V-phenylethyl-acrylamide] and poly-[(+)-A -methyl-A -phenyl-ethyl-acrylamide] (VIII) of different tacticity were prepared by Schultz and Kaiser [18] from the corresponding monomers using radical or ionic initiators. No assumptions on polymer conformation in solution have been made. 

Photo-induced polymerization of hydroxypropyl-P-CD/methyl methacrylate complex, i.e. HP-P-CD/MMA was performed in aqueous solution, at room temperature with Irgacure 2959, i.e. 4-(2-hydroxyethoxy)phenyl-(2-hydroxy-2-propyl)ketone serving as a photoinitiator [75]. The atom transfer radical polymerization (ATRP) and reversible addition fragmentation chain transfer (RAFT) [76] methods are also used to perform polymerization of the CD/guest monomer complexes in aqueous solutions. 

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