Ether complexes of tungsten with two different binding modes: An O-bound ether and an {eta}{sup 2}-(C=C) vinyl ether. Evidence for C-H...O hydrogen bonding of vinylic C-H groups
- Brookhaven National Lab., Upton, NY (United States)
The reaction of PhCH(OCH{sup 3}){sup 2} with Cp(CO){sup 3}WH and HOTf gives [Cp(CO){sup 3}W(PhCH{sup 2}OCH{sup 3})]{sup +}OTf{sup -}. The structure of this benzyl methyl ether complex was determined by single crystal X-ray diffraction and was shown to have the ether bonded to tungsten through the oxygen. This compound was isolated as a kinetic product of the reaction; it decomposes in solution by releasing free PhCH{sup 2}OCH{sup 3} and forming Cp(CO){sup 3}WOTf. An analog with the BAr`{sup 4}{sup -} counterion [Ar` = 3, 5-bis(trifluoromethyl)phenyl] is more stable. The reaction of the vinyl acetal CH{sup 2}=CHCH(OEt){sup 2} with Cp(CO){sup 3}WH and HOTf produces [Cp(CO){sup 3}W({eta}{sup 2}-EtOCH=CHCH{sup 3})]{sup +} OTf{sup -}, in which the ether is bonded to tungsten through the C=C bond of the vinyl ether. The crystal structure of this compound shows that the W-C(OEt) distance (2.69(3) A) is significantly longer than the W-C(CH{sup 3}) distance (2.37(3) A). There are weak C-H...O hydrogen bonds between both vinyl CH`s and oxygens of the triflate counterions. Evidence is presented that some of these weak hydrogen bonds are maintained in CD{sup 2}Cl{sup 2} solution but not in CD{sup 3}CN. 44 refs., 4 figs., 3 tabs.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 426241
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 45 Vol. 118; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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