Rhenium 2-oxoalkyl (enolate) complexes: Synthesis and carbon-carbon bond-forming reactions with nitriles
- Univ. of California, Berkeley (USA)
The (2-oxoalkyl)rhenium complexes (rhenium enolates) (CO){sub 5}ReCH{sub 2}COR{sup 1} (R{sup 1} = OEt, Me, Ph, 1-3) can be prepared on a multigram scale by alkylation of (CO){sub 5}ReNa with ClCH{sub 2}COR{sup 1}. The secondary enolate (CO){sub 5}ReCH(Me)CO{sub 2}Et (4) can also be prepared in a similar fashion with use of MsOCH(Me)CO{sub 2}Et (Ms = CH{sub 3}SO{sub 2}{sup {minus}}). The mono(phosphine) enolates cis-(Ph{sub 3}P)(CO){sub 4}ReCH{sub 2}R{sup 2}(R{sup 2} = CO{sub 2}Et, CO{sub 2}Bu{sup t}, CONEt{sub 2}, COMe, COPh, CN, 8-13) are prepared in high yield via alkylation of (Ph{sub 3}P)(CO){sub 4}ReNa with ClCH{sub 2}R{sup 2}. Synthesis of the secondary enolate cis-(Ph{sub 3}P)(CO){sub 4}ReCH(Me)CO{sub 2}Et (14) is accomplished in 75% yield by alkylation with TfOCH(Me)CO{sub 2}Et (Tf = CF{sub 3}SO{sub 2}{sup {minus}}). The chelating phosphine complex is substitutionally inert under forcing thermal and photochemical conditions. Kinetic studies of the nitrile insertion reaction revealed a weak linear dependence of the rate constant of the reaction on the concentration of added CH{sub 3}CN in benzene; we believe this to be a medium effect.
- OSTI ID:
- 7245986
- Journal Information:
- Organometallics; (USA), Vol. 9:2; ISSN 0276-7333
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
RHENIUM COMPLEXES
BONDING
SYNTHESIS
CALCULATION METHODS
DATA ANALYSIS
ENOLS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
NITRILES
ORGANOMETALLIC COMPOUNDS
ALCOHOLS
COMPLEXES
DATA
FABRICATION
HYDROXY COMPOUNDS
INFORMATION
JOINING
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties
360101 - Metals & Alloys- Preparation & Fabrication