2136-95-0Relevant articles and documents
Photochemical Behavior of Stable Free Radicals: The Photochemistry of Perchlorodiphenylmethyl Radical
Ruberu, Shiyamalie,Fox, Marye Anne
, p. 143 - 149 (2007/10/02)
The excitation of perchlorodiphenylmethyl radical (PDM) at 530 nm leads to the lowest excited doublet, D1 (τ = 31 ns), from which emission is observed (Φ = 1 x 10-3 +/- 0.0003).This state is quenched by electron donors and acceptors at a rate at or close to diffusion control and at much slower rates by oxygen and hydrogen atom donors.Fragmentation of PDM (Φd = 0.06) occurs from a higher excited doublet (Dn, n > = 2) producing intermediates that are trapped by O2, chlorine, or hydrogen donors, yielding products 1-6.Experimental evidence suggests a structure-photoreactivity correlation in the perchlorinated arylmethyl radicals in which the partitioning between photochemical cyclization or fragmentation depends on the twist angle between the appended phenyl rings.
An Easy, High-yield Synthesis of Highly Chlorinated Mono-, Di- and Triarylmethanes
Ballester, Manuel,Riera, Juan,Castaner, Juan,Rovira, Concepcion,Armet, Olag
, p. 64 - 66 (2007/10/02)
A simple, direct, high-yield Friedel-Crafts synthesis of highly chlorinated, overcrowded αH-aryl, αH-diaryl, and αH-triarylmethanes is described.The latter compounds are most valuable chemical precursors of inert free radicals, which are frequently obtain