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  • 1
    Electronic Resource
    Electronic Resource
    Carbonyl and Benzene Complexes of Lithium: Transition-Metal-Like Behaviour of Lithium in Organolithium Compounds (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 537-541 
    Details
    ISSN: 1434-1948
    Keywords: Lithium ; (Benzene)lithium complex ; (Carbonyl)lithium complex ; Ab initio calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complexes of CO and aromatic compounds were believed to be an exclusive domain of transition metals caused by their ability of backbonding to these ligands. But recently, (benzene)lithium and (carbonyl)lithium complexes were characterized by X-ray structure analysis and IR spectoscopy. In order to determine geometries of the complexes and the bonding energies of the benzene and CO molecule to the organolithium starting compound suitable models were chosen in combination with high-level ab initio calculations. For the carbonyl derivative a reaction enthalpy of -8 kcal/mol was found while the interaction with benzene reached unexpectedly -21 kcal/mol. This underlines the ability of lithium to act like a transition metal in subcoordinated organyl compounds without having d orbitals available for bonding.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, 219. (Di-tert-butylphosphanylimino)(2,2,6,6-tetramethylpiperidino)boran: ein BNP-1,3-“Dipol” (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1995-2002 
    Details
    ISSN: 0009-2940
    Keywords: Boranes, amino(phosphanylimino)- ; Phosphaborolines ; Iminophosphoranes ; 1,3,2,5-Oxazaphosphaboroles ; 1,3,4,2-Thiazaphosphaboroles ; 1,3,4,2-Diazaphosphaboroles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, 219[1]. - (Di-tert-butylphosphanylimino)(2,2,6,6,-tetrametylpiperidino)borane: a BNP 1,3-„Dipole”In contrast to amino-imino-boranes R2N-BN-R', which are susceptible to [2 + 2] cycloadditions, the amino(phosphanyl-imino)borane 2 [R = P(tBu)2] performs [3 + 2] cycloadditions with heteroallenes X≡C≡Y or nitriles to yield the novel five-membered heterocycles 3a-g, 6, 7, and 8. The reactions of 2 are dominated by the phosphorus atom as the nucleophile attacking the carbon atom in X≡C≡Y and R-CN, respectively. The driving force for the formation of the new heterocycles is obviously provided by the formation of an iminophosphorane structure and a three-coordinated environment at the boron atom. The X-ray-structures of 3a, 3c, 3e, and 3g demonstrate planer heterocyclic rings.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260905
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