33785-74-9

Upstream product

• 74-83-9 methyl bromide 
• 26880-95-5 (4-methylphenyl)(2-hydroxy-5-methylphenyl)methanone 
• 944648-05-9 C₁₆H₁₈O₂ 
• 1426391-27-6 bis[(2-methoxy-5-methylphenyl)(p-tolyl)methyl] ether 

Relevant academic research and scientific papers

Iodine-catalyzed disproportionation of aryl-substituted ethers under solvent-free reaction conditions

Iodine was demonstrated to be an efficient catalyst for disproportionation of aryl-substituted ethers under solvent-free reaction conditions. Variously substituted 1,1,1′,1′-tetraaryldimethyl ethers were transformed into the corresponding diarylketone and diarylmethane derivatives. I 2-catalyzed transformation of 4-methoxyphenyl substituted ethers yielded mono- and dialkylated Friedel-Crafts products as well. Treatment of trityl alkyl and trityl benzyl ethers with a catalytic amount of iodine produced triphenylmethane and the corresponding aldehydes and ketones. The electron-donating substituents facilitated the reaction, while the electron-withdrawing groups retarded it; the difference in reactivity is not very high. Such an observation may be in favour of hydride transfer, predominantly from the less electron rich side of the ether with more stable carbocation formation. With the isotopic studies it was established that a substantial portion of the C-H bond scission took place in the rate-determining step, while the carbonyl oxygen atom originated from the starting ether, and not from the air. The transformation took place under air and under argon, and HI was not a functioning catalyst.

A facile synthesis of dihydrobenzofuranols by photocyclization of (2-alkoxy-5-methyl-phenyl)(aryl) methanone and Ethyl 2-aroyl-4- methylphenyloxyacetates

Irradiation of 2-alkoxy substituted benzophenones 2a-f and ethyl 2-aroyl-4-methylphenyl-oxyacetates 2g-i in benzene and in acetonitrile underwent photocyclization to substituted dihydrobenzofuranols 3a-i with 3a-c in very less yield being racemate and 3d-