Sulfur-Coordinated Thiophene and Benzothiophene in Cp(NO)(PPh3)Re(thiophene)+: Conversion to Thienyl and Thienylcarbene Complexes

C–H Bond activation and C–C bond formation in the reaction of 2,5-dimethylthiophene with TpMe2Ir compounds

“…( 4) may proceed by a similar route to yield cationic hydride carbenes that rearrange by means of a 1,2-H shift from iridium to the carbene carbon, followed by b-H elimination. Somewhat similar results have been reported for the rhenium complex (g 5 -C 5 H 5 )Re(2-SC 4 H 3 )(NO)(PPh 3 ), 19 but in other instances different mechanistic pathways have been suggested. 20 The Ir-C(alkyl) bond of compound 4 undergoes direct protonolysis to provide the cationic olefin derivative 11 (eqn.…”

Thiophene and Butadiene−Thiolate Complexes of Molybdenum: Observations Relevant to the Mechanism of Hydrodesulfurization

“…Of these steps, it is the proposed involvement of an alkylidene species that ultimately enables selective hydrogen transfer to the carbon adjacent to the sulfur of the butadiene-thiolate ligand. Experimental evidence for alkylidene intermediates in the hydrogenation of thiophene C-S bond cleavage products has not previously been reported, 18 and the present study suggests that such species may facilitate thiophene hydrogenation during HDS.…”

Cycloaddition of Tungsten−η1-3-Furyl Compounds with Alkenes and Alkynes: Syntheses and Ring Cleavage of Tungsten−η1-Oxabicycloheptene and −η1-Oxabicycloheptadiene Compounds

“…To account for CF 3 SO 3 H-promoted deoxygenation of tungsten−η 1 -oxabicycloheptadienes 5 and 10 , we propose a mechanism in Scheme . The results in Table (entries 1−3) indicates that cleavage of the metal−carbon bond , of metal−η 1 -oxabicyclodienes is the preferred pathway to yield species J . Tungsten(II) is more oxophilic than molybdenum(II) to form higher oxidation species, and rearrangement of species J generates the O-bound oxabicyclicdiene species K .…”