Mild partial deoxygenation of esters catalyzed by an oxazolinylborate-coordinated rhodium silylene

Xu, Songchen; Boschen, Jeffery S.; Biswas, Abhranil; Kobayashi, Takeshi; Pruski, Marek; Windus, Theresa L.; Sadow, Aaron D.

doi:10.1039/C5DT02844B

Mild partial deoxygenation of esters catalyzed by an oxazolinylborate-coordinated rhodium silylene

Journal Article · Mon Aug 17 00:00:00 EDT 2015 · Dalton Transactions

DOI:https://doi.org/10.1039/C5DT02844B· OSTI ID:1221625

Xu, Songchen ^[1]; Boschen, Jeffery S. ^[1]; Biswas, Abhranil ^[1]; Kobayashi, Takeshi ^[1]; Pruski, Marek ^[1]; Windus, Theresa L. ^[1]; Sadow, Aaron D. ^[1]

Iowa State Univ., Ames, IA (United States)

An electrophilic, coordinatively unsaturated rhodium complex supported by borate-linked oxazoline, oxazoline-coordinated silylene, and N-heterocyclic carbene donors [{κ³-N,Si,C-PhB(Ox^Me²)(Ox^Me²SiHPh)Im^Mes}Rh(H)CO][HB(C₆F₅)₃] (2, Ox^Me² = 4,4-dimethyl-2-oxazoline; Im^Mes = 1-mesitylimidazole) is synthesized from the neutral rhodium silyl {PhB(Ox^Me²)₂Im^Mes}RhH(SiH₂Ph)CO (1) and B(C₆F₅)₃. The unusual oxazoline-coordinated silylene structure in 2 is proposed to form by rearrangement of an unobserved isomeric cationic rhodium silylene species [{PhB(Ox^Me²)₂Im^Mes}RhH(SiHPh)CO][HB(C₆F₅)₃] generated by H abstraction. Complex 2 catalyzes reductions of organic carbonyl compounds with silanes to give hydrosilylation products or deoxygenation products. The pathway to these reactions is primarily influenced by the degree of substitution of the organosilane. Reactions with primary silanes give deoxygenation of esters to ethers, amides to amines, and ketones and aldehydes to hydrocarbons, whereas tertiary silanes react to give 1,2-hydrosilylation of the carbonyl functionality. In contrast, the strong Lewis acid B(C₆F₅)₃ catalyzes the complete deoxygenation of carbonyl compounds to hydrocarbons with PhSiH₃ as the reducing agent.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358; W-7405-ENG-82

OSTI ID:: 1221625

Report Number(s):: IS--J-8724

Journal Information:: Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 36 Vol. 44; ISSN 1477-9226; ISSN ICHBD9

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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