33240-70-9

Upstream product

• 119-61-9 benzophenone 
• 3225-61-4 perchlorodiphenylmethyl radical 
• 118-74-1 hexachlorobenzene 
• 90-99-3 diphenylchloromethane 
• 33119-38-9 α-chlorobis(pentachlorophenyl)methane 
• 2051-90-3 Dichlorodiphenylmethane 
• 33240-66-3 bis(pentachlorophenyl)methanol 
• 7647-18-9 antimonypentachloride 
• 33240-67-4 Perchlor-diphenyl-methan 
• 141709-02-6 bis(pentachlorophenyl)methyl methanesulfonate 

Relevant academic research and scientific papers

Photochemical Behavior of Stable Free Radicals: The Photochemistry of Perchlorodiphenylmethyl Radical

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.

Synthesis of the Sterically Hindered Bis(pentachlorophenyl)acetic Acid and Derived Stable Free Radicals

Bis(pentachlorophenyl)acetic acid esters were synthesized from the α-hydroxydiaryl acetate esters 13 via the free radicals 15 formed on homolytic cleavage of the α-chloro compounds 14.The acid 8 underwent rapid decarboxylation in basic solution (e.g., Et3