Terminal ring, saturated

Hydrogenation of anthracene (30) over Raney nickel, platinum or palladium also gives 9,10 dihydroanthracene (31) as the initial product but a rhodium catalyst gives the octahydro product, 32, in which both terminal rings are saturated (Eqn. 17.28). Further hydrogenation takes place under the conditions used to saturate alkylbenzenes with the predominant product the cis ring junction isomer. 

Partial hydrogenation of either the ortho or meta terphenyl (33) over platinum or copper chromite results in the saturation of the internal ring (Eqn. 17.29) but hydrogenation of para terphenyl (34) takes place primarily on a terminal ring (Eqn. 17.30). ... 

In the partial hydrogenation of benz[a]anthracene (35) palladium promotes the regioselective production of the internally saturated dihydroarene, 36, while a platinum catalyst saturates a terminal ring to give the tetrahydroarene, 37, as... 

Saturation and cleavage of one of the terminal rings to form a paraffin and a bicyclic such as Tetralin. This reaction, which results in paraffin formation, is minor. 

At the request of an international petroleum company, a major manufacturer and supplier of down-hole equipment performed tests of the various elastomers commonly used in the construction of packers and other oil field tools. Seven of the nine most commonly used thermoplastic materials were found to be completely inert to TKPP solutions. The test included continual immersion in saturated TKPP for 21 days at 280°F. Only two elastomers, Vi-ton and Fluorel, showed any adverse reaction. O-rings made from these two elastomers showed minor cracking at the termination of the test. A listing of the elastomers that tested inert to TKPP solutions include nitrile, saturated nitrile (HNBR), Aflas, Kalrez, PEEK, Glass-filled Teflon, and Ryton. Several of these elastomers are attacked or degraded by conventional clear completion fluids containing calcium and zinc halides. The inertness of commonly employed elastomers to TKPP is an important advantage for TKPP fluids in normal operations. 

An important modification of the initial protocol has been introduced by Larock ef al. to afford indanones. The saturated ring results from the termination of the process by protonolysis of palladium enolate, which is likely to be generated from reversible palladium hydride elimination-addition. Proton source required for protonolysis hypothetically comes from adventitious water coming with hygroscopic chloride or solvent (Scheme 13). ... 

American practice is to use the terminations -ane for saturated and ene for unsaturated compounds in both the hydrocarbon and the heterocyclic series. British usage is essentially the same for hydrocarbons, but for heterocyclic molecules the final e is omitted in fact, a terminal e is used in general only for hydrocarbons, bases, and the five-membered ring ending ole. This leads in particular to some differences in the spelling of both trivial and systematic names for one-ring heterocycles e.g., thiophen, oxiren, dioxaphospholan (British) thiophene, oxirene, dioxaphospholane (American). 

The pseudoreceptor model was constructed with six amino acid residues. The imidazole ring of the ligands and the terminal basic function were saturated via... 

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