Generation and Reactivity Studies of Diarylmethyl Radical Pairs in Crystalline Tetraarylacetones via Laser Flash Photolysis Using Nanocrystalline Suspensions
作者:Jin H. Park、Melissa Hughs、Tim S. Chung、A. Jean-Luc Ayitou、Vanessa M. Breslin、Miguel A. Garcia-Garibay
DOI:10.1021/jacs.7b04449
日期:2017.9.27
The nanosecond electronic spectra and kinetics of the radical pairs from various crystalline tetraarylacetones were obtained using transmission laser flashphotolysis methods by taking advantage of aqueous nanocrystalline suspensions in the presence of submicellar CTAB, which acts as a surface passivator. After showing that all tetraarylacetones react efficiently by a photodecarbonylation reaction
An unprecedented oxidative intermolecular homo coupling reaction between two sp3C–sp3C centers under metal-free condition
作者:Santosh K. Sahoo
DOI:10.1016/j.tetlet.2016.06.092
日期:2016.8
An unprecedented formation of benzylic sp3C–sp3C coupled dibenzylic products has been illustrated. The reactions have been carried out in the presence of three oxidizing reagents, i.e., diacetoxy-iodobenzene (IBDA), N-fluorobenzenesulfonimide (NFSI), and pyridine (Py) using toluene derivatives.
Palladium-Catalyzed Reaction of 2-Hydroxy-2-methylpropiophenone with Aryl Bromides: A Unique Multiple Arylation via Successive C−C and C−H Bond Cleavages
2-Hydroxy-2-methylpropiophenone undergoes a unique multiple arylation via C-C and C-H bondcleavages upon treatment with excess aryl bromides in the presence of a palladium catalyst to give 1,1,2,2-tetraarylethanes and 4,4-diaryl-1-phenylisochroman-3-ones.
2-Hydroxy-2-methylpropiophenone 在钯催化剂存在下用过量的芳基溴化物处理后,通过 CC 和 CH 键裂解发生独特的多重芳基化,得到 1,1,2,2-四芳基乙烷和 4,4-二芳基-1 -phenylisochroman-3-ones。
Use of Isopropyl Alcohol as a Reductant for Catalytic Dehydoxylative Dimerization of Benzylic Alcohols Utilizing Ti−O Bond Photohomolysis
Titanium‐catalyzed dehydroxylative dimerization of benzylic alcohols using isopropyl alcohol as a reductant has been realized by photoirradiation. The key step is photohomolysis of the Ti−O bond, which enables the utilization of isopropyl alcohol as a hydrogen‐atom donor. The reaction can also proceed under visible‐light irradiation in the presence of thioglycolic acid as a ligand.
Restricted rotation about the aliphatic carbon–carbon bond in 1,2-disubstituted tetra-arylethanes
作者:P. J. M. Burchill、N. Thorne
DOI:10.1039/j39680000696
日期:——
The existence of stable rotational isomers of 1,2-dichlorotetraphenylethane previously reported, is shown to be incorrect, since dipole moment measurements indicate the presence of the trans-form only. Infrared studies of a number of 1,2-disubstituted tetra-arylethanes fail to account for the existence of possible gauche-forms, except in the case of the ethane-1,2-diols which occur exclusively in this