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  • Chemistry  (13)
  • Perfumes  (1)
  • 1990-1994  (1)
  • 1970-1974  (13)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 125 (1994), S. 1159-1169 
    ISSN: 1434-4475
    Keywords: Perfumes ; Sila Perfumes ; Isosteric Compounds ; Silazanes ; Olfactoric Theories
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Substitution of the (CH3)2CH=CH group by (CH3)2C=N in linalool as well as by the (CH3)2CH-CH2 group in linalool and in sila-linalool does not lead to noticeable changes of their scent qualities. On the contrary, substitution of the OH group at the tertiary C atom by NH2 or CH3 — hydride isosteric to OH according toGrimm — affords fishy or etheric instead of the original flowery smells thus indicating a transition to different basic classes of odor. Similar results were obtained with the linalool-like scents of benzyldimethylcarbinol and phenylethyldimethylcarbinol. Therefore the theory ofAmoore, after which only shape and size of molecules are ruling their odor qualities, must be called in question.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 164-176 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Decachloro-N,N′-bis(silyl)-cyclodisilazane (I), Cl10Si4N2, is formed via the reaction paths of scheme 1. The total substitution of the Cl atoms was achieved by methyllithium (→ II), methanol (→ III), ethanol (→ IV) or methylamine (→ V), whereas dimethylamine only reacted to (VI), and diethylamine to (VII). The stepwise substitution of the Cl atoms was not possible, in this case only mixtures of I with mono-, di- or trisubstituted products were received which gave further dismutation reactions on attempting their isolation. (1) was easily cleaved by HCl, but only (Cl3Si)2NH did result and not, as was hoped, N(SiCl3)3.
    Notes: Dekachlor-N,N′-bis(silyl)-cyclodisilazan (I), Cl10Si4N2, bildete sich auf den Reaktionswegen des Schema 1. Die Totalsubstitution der Cl-Atome gelang mit Methyllithium [→ me10Si4N2 (II)], Methanol [→ (meO)10Si4N2 (III)], Äthanol [→ (etO)10Si4N2 (IV)] oder Methylamin [→ (meNH)10Si4N2 (V)], während mit Dimethylamin nur (me2N)9ClSi4N2 (VI), mit Diäthylamin nur (et2N)6Cl4Si4N2 (VII) entstand. Versuche zur gezielten stufenweisen Substitution der Cl-Atome ergaben weitgehend Gemische des Ausgangsprodukts mit ein-, zwei- oder dreifach substituierten Derivaten, die sich bei Aufarbeitungsversuchen einer Isolierung durch weitere Dismutationen entzogen. Die HCl-Spaltung von I führte nicht wie erhofft zu N(SiCl3)3, sondern nur zu 2 (Cl3Si)2NH.
    Additional Material: 3 Tab.
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Inorganic Ring Systems. XX. Tricyclic Inorganic Ring Systems with Four and Five Different ElementsThe four ring systems D, E, F and G unknown solong, could be synthesized according to Schema 1. Their structure was confirmed by mass, proton resonance, and infrared spectroscopy. The single compounds are characterized by a deep green colour and an unusually high solubility in indifferent organic solvents.
    Notes: Die vier bisher unbekannten Ringsysteme D, E, F und G konnten nach den Angaben des Schema 1 synthetisiert werden. Ihre Struktur wurde durch Massen-, NMR- und IR-Spektren sowie Röntgenstrukturanalysen sichergestellt. Die einzelnen Verbindungen zeichnen sich durch eine tiefgrüne Farbe und ungewöhnlich hohe Löslichkeit in inerten organischen Lösungsmitteln aus.
    Additional Material: 5 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 249-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,5-Bis(alkylamino)octamethyltrisildiazanes react after metallation with element dichlorides according to reaction 3a and 3b respectivcly by forming ring compounds. In this way 1,2,8-organylsubstituted permethylated cyclotetrasilazanes (I, II) and inorganic eightmembered ringsystems BSi3N4. PSi3N4 and GeSi3N4, were prepared for the first time.
    Notes: 1,5-Bis(alkylamino)oktamethyltrisildiazane reagieren nach Metallierung mit Elementdichloriden über Rk. 3a oder 3 b unter Ringschluß. Neben 1,2,8-organylsubstituierten, permethylierten Cyclotetrasilazancn (I, II) ließen sich so erstmalig anorganische Achtringsysteme BSi3N4. PSi3N4 und GeSi3N4 darstellen.
    Additional Material: 4 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 115-123 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1.5-Bis(methylamino)hexamethyltrisildioxane reacts in the presence of triethylamine easily with germanium tetrachloride (equ. 1) and ethyldichlorophosphine (equ.2) to give the formerly unknown inorganic eightmembered ring systems Si3GeN2O2 and Si3PN2O2. Respectively. By analogous reacting of silicon tetrachloride only open chained Cl3Si—Nme—Sime2—O—Sime2—O—Sime—NHme (IV; equ. 3) is formed. With metallated 1.5-bis(alkylamino)trisildioxanes, dischlorodiorganylsilanes do not give the expected asymmetric-, but the symmetric cyclotetrasildioxdiazanes V-VII. Dichlorophenylborane, in an analogous reaction, leads to the novel eightmembered ring system BSi3N2O2, but the exact position of the N and O atoms in the ring could not be fixed beyond any doubt. The novel sixmembered ring system BSi2Ni2O was realized in compound IX via equ. (6).
    Notes: 1,5-Bis(methylamino)hexamethyltrisildioxan setzt sich in Gegenwart von Triäthylamin glatt mit Germaniumtetrachlorid (Rk. 1) oder auch mit Äthyldichlorphosphin (Rk. 2) zu den bisher unbekannten anorganischen Achtringsystemen Si3GeN2O2 und Si3PN2O2 um. Bei analoger Reaktionsführung gibt Siliciumtetrachlorid nur offenkettiges Cl3Si—Nme—Sime2—O—Sime2—NHme (IV; Rk. 3). Metallierte 1.5-Bis(alkylamino)trisildioxane reagieren mit Diorganyldichlorsilanen überraschenderweise zu symmetrischen Cyclotetrasildioxdiazanen, V-VII, nicht zu den erwarteten asymmetrischen Achtringen. Die analoge Umsetzung mit Phenyldichlorboran führt nach Rk. (5) zu dem neuen Achtringsystem BSi3N2O2, doch läßt sich hierin die Stellung der Ringglieder noch nicht eindeutig festlegen. Ein neues Sechsringsystem BSi2N2O konnte in Verbindung IX fiber über Rk. (6) realisiert werden.
    Additional Material: 1 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 402 (1973), S. 147-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Inorganic Ring Systems. XVII. The Inorganic Sixmembered Ring Systems of 1-Thia (VI)-3,5-disila-2,4,6-triaza- and 1- Thia(VI)-3,5-disila-4-oxa-2,6-diaza-cyclohexanesFollowing the principle of synthesis of rings by condensation of two threemembered α,ω-difunctional units in high dilution the inorganic sixmembered ring systems from 3 and 4 different elements, Si2SN3 and Si2SN2O, with single bonds in the ring structure and with sulfur of the oxidation number +6 could be prepared via equ. (1) and (2) for the first time. They are characterized in their compounds I-VII.
    Notes: Nach dem Prinzip der Ringsynthesen durch Kondensation zweier dreigliedriger α,ω-difunktioneller Bausteine in hoher Verdünnung ließen sich erstmalig die aus 3 bzw. 4 verschiedenen Elementen bestehenden rein anorganischen Sechsringsysteme Si2SN3 und Si2SN2O mit Einfachbindungen im Ring und Schwefel der Oxydationszahl +6 aufbauen (Rkk. 1; 2) und in den Verbindungen I-VII charakterisieren.
    Additional Material: 3 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 402 (1973), S. 139-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Inorganic Ring Systems. XV. The Sixmembered Ring Systems PIIISi2N3, [PVSi2N3]⊕ and PVSi2N3Compounds I-X of the sixmembered ring system PSi2N3 with phosphorus in different oxidation and bond numbers, collected in scheme 1, have been prepared for the first time and confirmed in their structure by elemental analysis as well as by infrared and 1H and 31P spectroscopy.
    Notes: Die in Schema 1 zusammengefaßten Verbindungen I bis X der Ringsysteme der Titelüberschrift wurden erstmalig dargestellt und über Elementaranalysen, IR-, 1H- und 31P-NMR-Spektren in ihrer Struktur sichergestellt.
    Additional Material: 3 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 381 (1971), S. 168-175 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Decamethylcyclotetrasilazane (I) was prepared starting with 1,3-dichloropentamethyldisilazane (II), 1.3-dichlorotetramethyldisilazane (III) and 1,3-bis-(methylamino)tetramethyldisilazane (IV). respectively, according to scheme 1, equ. (1), (2) and (3) in the text. (I) does not form, as given in the literature (equ. 4)5, by thermal transformation of bis(methylaminodimethylsilyl)-tetramethylcyclodisilazane (V); in this case exclusively - in equ. (2) and (3) only in side steps - the reaction products are a mixture of N-methylcyclotrisilazanes (scheme 2, VI-IX).
    Notes: Dekamethylcyclotetrasilazan (I) läßt sich aus 1,3-Dichlorpentamethyldisilazan (II), 1,3-Dichlortetramethyldisilazan (III) wie auch aus 1,3-Bis(methylamino)-tetramethyldisilazan (IV) gemäß Schema 1, Rkk. (1) bis (3), nicht jedoch durch die in der Literatur5 beschriebene thermische Umlagerung von Bis(methylaminodimethylsilyl)-tetramethylcyclodisilazan (V) (vgl. Rk. 4) darstellen. Hierbei entsteht ausschließlich, - in den Rkk. (2) und (3) nur auf Nebenwegen -, ein Gemisch von N-Methylcyclotrisilazanen (Schema 2, VI-IX).
    Additional Material: 2 Tab.
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Partial ammonolysis of silicon tetrachloride in diethylether below -60°C gives hexachlorodisilazane (I; yield 40%), hexachlorocyclotrisilazane (II; 3-5%) and polychlorosilazanes, mainly [Cl2SiNH]x (III). For a survey of the single steps of this reaction, see scheme 2. Cleavage of III with HCl, HBr (in benzene or ether) or SiCl4 (elevated temperature and pressure) gives more I in moderate and octachlorotrisildiazane (IV) in very low yield. I reacts with butyllithium to lithium-bis(trichlorosilyl)amide (IX). This compound forms deutcrohexachlorodisilazane on reaction with heavy water and decomposes on heating into LiCl and decachloro-bis(silyl)-cyclodisilazane (XIX). Physical properties and analytical data of the conpounds are summarized in tables 2 and 3. Many other reactions of I, II and IX may be seen in chapter 4a, b as well as in schemes 3, 4 and 6.
    Notes: Die partielle Ammonolyse you Siliciumtetrachlorid in Diäthyläther 〈-60° führt zu Hexachlordisilazan (I; 40% Ausbeute), Hexachlorcyclotrisilazan (II; 3-5%) und Polychlorsilazanen, vornehmlich [Ci2SiNH]x (III). Einen Überblick über die einzelnen Reaktionsschritte gibt Schema 2. Durch Spaltung von III mit HCl oder HBr in Benzol oder Äther bzw. mit SiCl4 unter erhöhten Temperaturen und Drücken entsteht weiteres I in bescheidenen und Oktachlortrisildiazan (IV) in sehr geringen Ausbeuten. I bildet mit Butyllithium Lithium-bis-(trichlorsilyl)amid (IX). Dieses reagiert mit Schwerem Wasser zu Deuterohexachlordisilazan (V) und zerfällt beim Erwärmen in LiCl und Dekachlor-bis(silyl)-cyclodisilazan (XIX). Physikalische Daten und Analysen dieser Verbindungen sind in Tab. 2 und 3 zusammengefaßt. Weitere Reaktionen von I. II und IX können aus Kap. 4a. b sowie Schema 3, 4 und 6 ersehen werden.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: By reaction of 1.3-dichloro-pentamethyldisilazane and -tetramethyldisiloxane with hydrazine and 1.2-dimethylhydrazine respectively the novel inorganic ring systems (C), (D)/(D′), (E)/(E′) and (F) (see chapter 1) represented by the compounds I-IV could be constructed. So long it was not possible to decide if the compounds of the systems D/D′ and E/E′ have bicyclo[3.3.0]-octane or cyclobutyl-cyclobutane structure.
    Notes: Durch Umsetzung von 1,3-Dichlor-pentamethyldisilazan und -tetramethyldisiloxan mit Hydrazin bzw. 1,2-Dimethylhydrazin ließen sich in den Verbindungen I-IV die neuen anorganischen Ringsysteme (C), (D)/(D′), (E)/(E') und (F) (siehe Kap. 1) aufbauen. Bisher konnte keine endgültige Entscheidung getroffen werden, ob es sich bei den Systemen D/D′ und E/E′ um NSi2N2Si2N- bzw. OSi2N2Si2O-Bicyclo[3,3,0]-oktan- oder um NSi2N—NSi2N- bzw. OSi2N—NSi2O-Cyclobutyl-cyclobutan-Derivate handelt.
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