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  • 1
    Electronic Resource
    Electronic Resource
    (Di-tertbutylmethylsilyl)amide - a Building Block for Azasilacyclobutane Synthesis (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 823-828 
    Details
    ISSN: 0009-2940
    Keywords: Aminosilanes ; Lithium compounds ; 1,3-Diaza-2,4-disilacyclobutanes ; 1-Aza-2,4-disilacyclobutane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Di-tert-butylmethylsilylamide reacts with n-BuLi to give the tetrameric lithium di-tert-butylmethylsilylamide 1. Reactions of lithium (di-tert-butylmethylsilyl)amide 1 with SiF4 give the mono- (2), bis- (3), tris- (4), and tetrakis- (5) -[(di-tert-butylmethylsilyl)amino]silanes. Lithiated 3 reacts with Me3SiCl to form (di-tert-butylmethylsilyl-trimethylsilyl)amino-(di-tert-butylmethylsilyl)amino-difluorosilane (6); the 1,3-diaza-2,4-disilacyclobutane 7 is obtained by LiF elimination. The lithium derivative of 6 (compound 8) crystallizes with formation of a (SiFNLi) four-membered ring system. The 19F-NMR spectrum proves that the Li-F bond fluctuates in solution. Reactions of 1 with (Me3Si)2C(SiF3)2 afford different products (9, 10) by controlling the reaction sequence. An excess of 1 reacts to give a four-membered CSi2N ring system, the 1-(di-tert-butylmethylsilyl)-2,4-bis-[(di-tert-butylmethylsilyl)-amino]-2,4-difluoro-3-bis(trimethylsilyl)-1-aza-2,4-disila-cyclobutane (9), disubstitution with formation of bis[(di-tert-butylmethylsilyl)aminodifluorosilyl]bis(trimethylsilyl)methane (10) occurs in a molar ratio of 2:1. The cyclodisilazane 11 is obtained from dilithiated 10 in an intramolecular interconversion reaction. The crystal structures of 1, 8, 9, and 11 are reported.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290713
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  • 2
    Electronic Resource
    Electronic Resource
    Dilithium-N,N′-bis(trimethylsilyl)hydrazid und ein Hydrolyseprodukt side-on und end-on an N2-2- und O2-2-gebundene Li-Kationen (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 845-847 
    Details
    ISSN: 0009-2940
    Keywords: Lithium compounds ; Hydrazines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dilithium N,N′-Bis(trimethylsilyl)hydrazide and a Hydrolysis Product: Side-On- and End-On-Coordinated Li Cations to N2-2 and O2-2N,N′-Bis(trimethylsilyl)hydrazine is converted into the dilithium derivative [(Me3Si)2N2Li2] · 2 thf (1) by nBuLi. Compound 1 forms a tetramer which lies on a crystallographic inversion centre. The Li+ ions are found to be end-on to the N—N units and also coordinated by thf, but three Li+ ions are also positioned symmetrically above the N—N bonds. The hydrolysis of 1 in air leads to the formation of [(Me3SiOLi)4 · Li2O2 · LiN(SiMe3)2] · 2 thf (2) which contains four oxide and one peroxide ions. The O2-2 unit is side-on-coordinated by three Li+.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270510
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  • 3
    Electronic Resource
    Electronic Resource
    Dilithium Derivatives of Bis(tert-butyldimethylsilylamino)silanes as Building Units for Inorganic Ring Compounds (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 351-355 
    Details
    ISSN: 0009-2940
    Keywords: Bis(silylamino)silanes ; Lithium compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bis[(tert-butyldimethylsilyl)amino]silanes 1-3 are converted into their lithium derivatives 4-7 with BuLi. Depending on the bulkiness of the substituents, the dilithium derivatives 4 and 5 crystallize in cis or trans conformation. Monolithiated 3 (6) forms a four-membered (SiFLiN) ring system, while its dilithium salt is characterized as a lithium silyldiamide (7), Although 4, 5, and 7 have different structures, they react with PF3 (8, 9), SiF4 (10, 11), and CMe3SiF3 (12) as diamides to give the corresponding four-membered ring systems 8-12. The crystal structures of 4 and 5 are reported.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280406
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    Paper (German National Licenses)
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