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  • 1
    Electronic Resource
    Electronic Resource
    Ringkontraktionsreaktionen von Octamethylcyclotetrasilazanen zu silylsubstituierten Cyclotrisilazanen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 779-782 
    Details
    ISSN: 0009-2940
    Keywords: Cyclotetrasilazanes / Ring contraction / Cyclotrisilazanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ring Contractions of Octamethylcyclotetrasilazanes to Silyl-Substituted CyclotrisilazanesReaction of the mono- and dilithium derivatives of bis(fluorsilyl)-substituted cyclotetrasilazanes with fluorosilanes and fluoroboranes leads to ring contraction with formation of cyclotrisilazanes (1 - 8). The isomerisation is proved by the crystal structure determination of 1 and by NMR spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230421
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  • 2
    Electronic Resource
    Electronic Resource
    1,3-Bis[tert-butyl(di-tert-butylfluorsilyl)amino]trisulfan - eine Verbindung mit FSiNSSSNSiF-Helix (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2651-2653 
    Details
    ISSN: 0009-2940
    Keywords: Disulfane, bis[(fluorosilyl)amino] derivative ; Trisulfane, 1,3-bis[(fluorosilyl)amino] derivative ; Selane, bis[(fluorosilyl)amino] derivative ; Helix structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3-Bis[tert-butyl(di-tert-butylfluorosilyl)amino]trisulfane - a Compound with FSiNSSSNSiF HelixThe lithium derivative of tert-butyl(di-tert-butylfluorosilyl)-amine (1) reacts with sulfur or selenium to give the bis[(fluorosilyl)-amino]di- and -trisulfanes 2, 3 and -selane 4, respectively. The trisulfane 3 crystallizes from n-hexane and exhibits a helical structure (X-ray analysis).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241203
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  • 3
    Electronic Resource
    Electronic Resource
    Cyclische Natrium- und Kalium-(fluorsilyl)phosphide - Synthesen und Kristallstrukturen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 71-73 
    Details
    ISSN: 0009-2940
    Keywords: (Fluorosilyl)phosphides, cyclic / Heterocycles, eight-membered / Phosphides, alkali ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclic Sodium and Potassium (Fluorosily1)phosphides - Syntheses and Crystal Structures(Di-tert-butylfluorosilyl)(mesityl)phosphine (1) reacts with sodium or potassium to give the alkali compounds [(CMe3)2SiFM(THF)2PC6H2Me3]2 (2: M = Na; 3: M = K). The crystal structures of the eight-membered rings 2 and 3 have been determined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230114
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  • 4
    Electronic Resource
    Electronic Resource
    Insertions-, Isomerisierungs- und Cycloadditions-Reaktionen lithiierter AminofluorsilaneHerrn Professor Dr. Anton Meller zum 60. Geburtstag gewidmet. (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 783-788 
    Details
    ISSN: 0009-2940
    Keywords: Silanes, aminofluoro- ; Insertion ; Isomerisation ; Cycloaddition ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Insertion, Isomerization, and Cycloaddition Reactions of Lithiated Aminofluorosilanes*The lithium derivative 2 of (di-tert-butylfluorosilyl)(fluorodi-isopropylsilyl)amine (1) reacts with benzoyl chloride to form the imines 3I and 3II in an insertion reaction. LiF elimination from 2 leads to the cyclodisilazane [(CMe3)2SiFN - Si(CHMe2)2]2 (4). The fluorine atom of the SiF(CHMe2) group in 1 can be substituted by means of LiOSiMe3 to yield 5. The lithium derivative of 5 (6) is a dimer with very short Li - F distances. The lithium derivative 6 reacts with benzaldehyde in a [2 + 2] cycloaddition to give an (SiNCO) four-membered ring compound (7), which thermally decomposes to yield the imine 8 and a cyclosiloxane, A fluorine/chlorine exchange is observed when Me3SiCl is added to the lithium derivative 6. The resulting unstable lithium derivative of an aminochlorosilane eliminates LiCl to form the cylcodisilazane 9. According to a crystal structure determination the formation of 9 involves isomerization of the intermediate iminosilane followed by dimerization.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250405
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  • 5
    Electronic Resource
    Electronic Resource
    Notizen/Notes. Natrium- und Kaliumfluorsilylamide - Synthese und Kristallstruktur (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1039-1041 
    Details
    ISSN: 0009-2940
    Keywords: Fluorosilylamides of K, Na ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sodium and Potassium Fluorosilylamides - Synthesis and Crystal Structurestert-Butyl(di-tert-butylfluorosilyl)amine (1) reacts with sodium or potassium to give the alkali salts 2 or 3, respectively. 2 and 3 crystallize as THF adducts and form head-to-tail dimers. Sodium is tetracoordinated in 2 and potassium hexacoordinated in 3. The crystal structures of the alkali salts are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230516
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  • 6
    Electronic Resource
    Electronic Resource
    Trisilazan-1-yl-cyclodisilazane  -  Expansionen, Kontraktionen und Ringkopplungen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1817-1820 
    Details
    ISSN: 0009-2940
    Keywords: Cyclodisilazanes ; Ring expansion ; Ring contraction ; Ring coupling ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trisilazan-1-yl-cyclodisilazanes  -  Expansions, Contractions. and Ring CouplingsLithiated trisilazan-1-yl-cyclodisilazanes react in different ways. The lithium derivatives of 2 and 3 react with fluorosilanes with substitution to give 4 and 5. In the reaction of dilithiated 3 with chlorotrimethylsilane the cyclotrisilazane 6 is formed by ring expansion. In the same reaction the symmetrically substituted four-membered ring 7 is obtained, which is formed by ring contraction of the anion of 6. The silyl-bridged ring systems 8-11 are obtained on reaction of dilithiated 3 with fluorosilanes and F2BN(SiMe3)2. An analogous silylbridged four-membered ring system 12 is formed in the reaction of the eight-membered ring anion with F3SiN(SiMe3)2.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230910
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  • 7
    Electronic Resource
    Electronic Resource
    Vom Lithium-Derivat des Aminodi-tert-butylfluorsilans zu Cyclodi-, -tri- und -tetrasilazanen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1941-1945 
    Details
    ISSN: 0009-2940
    Keywords: Lithium (di-tert-butylfluorosilyl)amide ; Cyclotetrasilazane ; 1,3,5-Triamino-2,4,6-trisilazane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aminodi-tert-butylfluorosilane (CMe3)2 SiFNH2 reacts with BuLi in hexane to give the lithium derivative 1, which crystallizes from TMEDA with formation of the dimer 2 [(CMe3)2SiFNHLi(TMEDA)]2. LiF elimination from 1 or 2 leads to cyclodi- (3), -tri- (4), and -tetrasilazane (6). 3 is the main product of the LiF elimination from 2 and 4 the main product resulting from 1. Cyclotetrasilazane 6 is the most planar eightmembered Si-N ring known so far. Chain compound 5 is the direct precursor of 4. The crystal structures of 2, 5, and 6 are described.From the Lithium Derivative of Amino-di-tert-butylfluorosilane to Cyclodi-, -tri-, and -tetrasilazanes
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240909
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  • 8
    Electronic Resource
    Electronic Resource
    (Di-tert1-butylfluorsilyl)hydrazin, ein Baustein für strukturisomere N,N- und N,N′1-Bis(silyl)hydrazineHerrn Professor Heinrich Nöth zum 65. Geburtstag gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1413-1416 
    Details
    ISSN: 0009-2940
    Keywords: Hydrazine, N-(fluorosilyl)- ; Condensation ; Cyclization ; Bis(silyl)hydrazines ; Isomerism, structural ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (Di-tert1-butylfluorosilyl)hydrazine, a Building Block for Structure-Isomeric N,N- and N,N′1-Bis(silyl)hydrazinesDi-tert1-butyldifluorosilane reacts with monolithiated hydrazine to give the stable monosilylated hydrazine 1 and the six-membered ring 2. The bis(fluorosilyl)hydrazine 3 is formed in a condensation reaction by heating 1 at 220°C. HCl elimination between 1 and chlorosilanes leads to the N,N′1-disubstituted hydrazines 4 and 5. An N,N′1-bis(silyl)hydrazine 6 is obtained in the reaction of lithiated 1 with difluorodiisopropylsilane while an N,N1-bis(silyl)hydrazine 7 is formed with tert1-butyltrifluorosilane. Structural isomerism (8-11) is observed in reactions of lithiated 1 with [(trifluorosilyl)amino]silanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260621
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Lithium-Verbindungen eines Chlorsilanols und von Fluor-funktionellen Siloxanolen; Reaktionen und Kristallstrukturen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 449-453 
    Details
    ISSN: 0009-2940
    Keywords: Lithium salts / Chlorosilanol / Fluorosilanolates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium Compounds of a Chlorosilanol and of Fluoro-Functional Siloxanols; Synthesis and Crystal StructuresThe lithiated disilanol (CMe3)2Si(OH)2 (1) serves as a starting material in the reaction with halosilanes for the stepwise construction of siloxanols (4, 5, 7). 4 and 7 react with n-C4H9Li to give the lithium compounds 6 and 8, respectively. 6 crystallizes in hexane as a trimer with planar three-coordinated lithium, bonded to two Si-O atoms and one Si - F atom. 8 reacts in THF with LiF elimination to give cyclotrisiloxane 9. The chlorosilanol 2 is prepared by hydroxy-chlorine exchange in 1 with PCl5. The stable lithium derivative of 2 (3) forms a dimeric THF adduct with tetrahedral lithium.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230306
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