[reaction: see text] The titanium-methylene complexes derived from the TiCl(4)-Mg-CH(2)Cl(2) system serve as a novel class of ambiphilic carbenoid equivalents, which not only efficiently effect cyclopropanations of a variety amides but also exhibit high chemoselectivity.
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http://dx.doi.org/10.1021/ol060438p | DOI Listing |
Angew Chem Int Ed Engl
June 2016
Institut für Chemie, Anorganische Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany.
The lithium bis(imino)stannylenoid (NIPr)2 Sn(Li)Cl (1; NIPr=bis(2,6-diisopropylphenyl)imidazolin-2-imino) was prepared by the reaction of LiNIPr with 0.5 equiv of SnCl2 ⋅diox (diox=1,4-dioxane) and the ambiphilic character of the compound was demonstrated by investigations into its reactivity. Treatment of 1 with I2 or MeI yielded the oxidative addition products (NIPr)2 SnI2 and (NIPr)2 Sn(Me)I, respectively.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
October 2014
Centrum für Molekulare Materialien CM2, Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615 Bielefeld (Germany).
Lithium carbenoids are versatile compounds for synthesis owing to their intriguing ambiphilic behavior. Although this class of compounds has been known for several years, few solid-state structures exist because of their high reactivity and often low thermal stability. Using cryo X-ray techniques, we were now able to elucidate the first solid-state structure of a Li/F alkyl carbenoid, pentafluoroethyllithium (LiC2F5), finally yielding a prototype for investigating structure-reactivity relationships for this class of molecules.
View Article and Find Full Text PDFDalton Trans
March 2014
Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
An α-chloro lithium base stabilised by a sulfonyl and thiophosphinoyl moiety was selectively prepared by lithiation of its protonated precursor and oxidation of the corresponding dilithio methandiide. The carbenoid-like compound was found to be remarkably stable even at room temperature and thus allowed for its spectroscopic characterisation in solution and in the solid state. Its ambiphilic nature was tested and compared with typical carbenoids both experimentally and by computational methods.
View Article and Find Full Text PDFJ Org Chem
August 2012
LSOM-CNRS/U-PSUD, Institut de Chimie Moléculaire et des Matériaux d'Orsay, 15 Rue Georges Clémenceau, 91405 Orsay Cedex, France.
Mechanisms of alkylation by PhCH(2)Cl or CH(3)I in THF and of deuteriation by DCl (4 N in D(2)O) in THF or THF-toluene of lithiated phenylacetonitrile monoanions and dianions obtained with LHMDS, LDA, or n-BuLi are studied by vibrational and NMR spectroscopy and quantum chemistry calculations. Dialkylation of the three dilithio dianions generated with n-BuLi (2.0-2.
View Article and Find Full Text PDFOrg Lett
May 2006
Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan, Republic of China.
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