Hydrogenolysis of Diarylmethanes

Another index of demethylation will be defined as follows  

Activities and Catalytic Behaviors of Various Metallic Oxides  

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Diphenylmethane (DPM), the basic hydrocarbon of the diarylmethane series, is the most appropriate compound for studying the kinetics of the catalytic hydrogenolysis of diarylmethane. This study involved a CoO-M0O3-AI2O3 catalyst (4 wt % CoO, 12 wt % M0O3) (5i). 

VI. Active Species of MoQj-Ai Q, Catalyst for Hydrogenolysis of Diarylmethanes... 

Such hydrogenolysis indicates that the following two parallel reactions occur and that their ratio will vary substantially with degree and location of methyl group in the catalytic hydrogenolysis of asymmetric diarylmethanes (Ar—CH2—Ar ) ... 

It is interesting to consider the factors affecting the product selectivity. Our experimental studies have examined precisely such phenomena. In this article we review the hydrogenolysis of asymmetric diarylmethanes based on our investigations. 

D. The Kinetics and the Scheme of the Catalytic Hydrogenolysis of Asymmetric Diarylmethane... 

Another unexpected hydrogenolysis reaction was discovered by Lautens while attempting to expand the scope of the cvf/to-alkylation/dircct arylation of thiophenes. When benzyl chlorides were used as alkylating agents, significant amounts of the orffto-benzylation/hydrogenolysis product were obtained. An optimization of the reaction conditions led to an efficient synthesis of diarylmethanes (Scheme 41) [92], This reaction is unique compared to the aforementioned... 

Scheme 41 Synthesis of diarylmethanes via ort o-benzylation/hydrogenolysis sequence...

Asymmetric diarylmethanes, hydrogenolytic behaviors, 29 229-270, 247-252 catalytic hydrogenolysis, 29 243-258 kinetics and scheme, 29 252-258 M0O3-AI2O3 catalyst, 29 259-269 relative reactivity, 29 255-257 schematic model, 29 254 Asymmetric hydrogenations, 42 490-491 Asymmetric synthesis, 25 82, 83 examples of, 25 82 Asymmetry factor, 42 123-124 Atom-by-species matrix, 32 302-303, 318-319 Atomic absorption, 27 317 Atomic catalytic activities of sites, 34 183 Atomic displacements, induced by adsorption, 21 212, 213 Atomic rate or reaction definition, 36 72-73 structure sensitivity and, 36 86-87 Atomic species, see also specific elements adsorbed... 

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