Fluorinated tertiary alcohols and alkoxides from nucleophilic trifluoromethylation of carbonyl compounds
作者:Stefan P. Kotun、John D. O. Anderson、Darryl D. Des Marteau
DOI:10.1021/jo00030a018
日期:1992.2
(CH3)3SiCF3 reacts with fluoro ketones in the presence of excess KF in CH3CN to produce alkoxides derived from formal addition of CF3- to the carbonyl carbon. These alkoxides may be isolated as such or acidified to the corresponding alcohols. Ketones to which this technique was applied include (CF3)2C = O, CF3C(O)CF2Cl, CF3C(O)CF2H, and [(CF3)2CF]2C = O. The last compound reacts with replacement of one of its perfluoroisopropyl groups by CF3. With 2 equiv of TMS-CF3, the acid fluorides RC(O)F (R = CF3CF2, n-C3F7, n-C7F15) yield products of the form RC(CF3)2OX (X = K, H) due to both substitution and addition of CF3 at the carbonyl. Similarly, F2C = O with 3 equiv of TMS-CF3 provides a novel and high-yield synthesis of the perfluoro-tert-butoxide group. Phosgene does not appear to react directly with the TMS-CF3/KF system, but is converted first to F2C = O. The intermediate ketone CF3CF2C(O)CF3 is observed in reactions of equimolar amounts of CF3CF2C(O)F and TMS-CF3.
作者:Feng Zhai、Konstantin V. Bukhryakov、Richard R. Schrock、Amir H. Hoveyda、Charlene Tsay、Peter Müller
DOI:10.1021/jacs.8b09616
日期:2018.10.24
to be a trigonal bipyramidal anti benzylidene complex in which the o-methoxy oxygen is coordinated to the metal trans to the apical oxo ligand. Addition of 1 equiv of water (in THF) to the benzylidyne complex, Mo(CArp)(OR)3(THF)2 (Arp = para-methoxyphenyl, OR = ORF6 or OC(CF3)3 (ORF9)) leads to formation of Mo(CArp)(OR)2(μ-OH)(THF)}2(μ-THF) complexes. Addition of 1 equiv of a phosphine (L) to Mo(CArp)(ORF9)3(THF)2
Multiple metal-carbon bonds. 38. Preparation of trialkoxymolybdenum(VI) alkylidyne complexes, their reactions with acetylenes, and the x-ray structure of Mo[C3(CMe3)2][OCH(CF3)2](C5H5N)2
作者:Laughlin G. McCullough、Richard R. Schrock、John C. Dewan、John C. Murdzek
DOI:10.1021/ja00307a025
日期:1985.10
Preparation des complexes MO(CCMe 3 )(CH 2 CMe 3 ) 3 , et des complexes Mo(CCMe 3 )X 3 (dme). Les acetylenes internes ne reagissent pas avec MO(CCMe 3 )(OCMe 3 ) 3 ; ils sont grandement polymerises par MO(CCMe 3 )(OCHMe 2 ) 3 et MO(CCMe 3 )(OCH 2 CMe 3 ) 3 . Structure cristalline
Facile and systematic access to the least-coordinating WCA [(R<sup>F</sup>O)<sub>3</sub>Al–F–Al(OR<sup>F</sup>)<sub>3</sub>]<sup>−</sup> and its more Lewis-basic brother [F–Al(OR<sup>F</sup>)<sub>3</sub>]<sup>−</sup> (R<sup>F</sup> = C(CF<sub>3</sub>)<sub>3</sub>)
作者:Arthur Martens、Philippe Weis、Michael Christian Krummer、Marvin Kreuzer、Andreas Meierhöfer、Stefan C. Meier、Jan Bohnenberger、Harald Scherer、Ian Riddlestone、Ingo Krossing
DOI:10.1039/c8sc02591f
日期:——
reactions with Me3Si–F–Al(ORF)3, generating relatively large countercations that are unsuited for further use as universal starting materials. Especially [al–f–al]− is of interest for the stabilization of reactive cations, since it is even weaker coordinating than [Al(ORF)4]− and more stable against strong electrophiles. This bridged anion can be seen as an adduct of [f–al]− and Al(ORF)3. Thus, it is similarly
通过路易斯酸 Me 3 Si–F–Al(OR F ) 3与一系列 [PF 6 ] -盐的反应,释放出气态 PF 5和 Me 3 Si–F 以及阴离子 [F–Al(可以得到OR F ) 3 ] − ([f–al] − ; RF = C(CF 3 ) 3 ) 。通过将另一当量的 Me 3 Si–F–Al(OR F ) 3添加到 [f–al] -中,释放气态 Me 3 Si–F 并释放出最少配位阴离子的盐 [(R F O) 3 Al–形成F–Al(OR F ) 3 ] - ([al–f–al] - )。两种程序均适用于一系列合成有用的阳离子,包括 Ag +、[NO] +、[Ph 3 C] +,并且在非常干净的反应中,批量大小为 5 g,产率通常超过 90%。此外,Me 3 Si–F–Al(OR F ) 3的合成已得到优化,并在一锅法中放大至 85 g 批次。这些阴离子以前只能通过难以控制的 [Al(OR
Luminescence of Lanthanide Complexes with Perfluorinated Alkoxide Ligands
作者:Christopher M. Kotyk、Jeremy E. Weber、Ariel S. Hyre、James McNeely、Jorge H. S. K. Monteiro、Marek Domin、Gary J. Balaich、Arnold L. Rheingold、Ana de Bettencourt-Dias、Linda H. Doerrer
DOI:10.1021/acs.inorgchem.0c00782
日期:2020.7.20
were found to have luminescence lifetimes in the millisecond range, indicating phosphorescence rather than fluorescence. The performance of a pair of multireference models for prediction of the Ln = Nd, Eu, and Dy absorption spectra was assessed. It was found that spectroscopy-oriented configuration interaction as applied to a simplified model in which the free-ion lanthanide was embedded in ligand-centered