Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 21 (1988), S. 3342-3343 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 56-58 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract As an alternative to volumetric analysis, 11B NMR spectroscopy can be used to determine the hydride concentration and the relative amount of different active hydride species in mixtures of alkyldiboranes(6) (alkyl = Et, Pr). Inorganic selenium(IV) compounds react with propyldiboranes(6) at first to give elemental selenium (hydride number HN = 4) and after prolonged heating at 130 °C to selenides (HN = 6). In contrast, tellurium(IV) and tellurium(VI) compounds are reduced only to elemental tellurium.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 42 (1977), S. 3151-3157 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 3054-3055 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 41 (1976), S. 2316-2320 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 395-401 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Compounds, XXXI. Z/E-Substituted Allylamines from 1-AlkynesThe electrophilic addition of dimethylmethyleneammonium bromide to sodium trialkyl-1-propynylborates Na[R3BC≡CMe] [R=Me (1 a), Et (1 b)] gives Z/E-mixtures (ca. 1:1) of N-(3-dialkylboryl-2-methyl-3-alkylallyl)dimethylamines (2a, b) in 96% yield. The different behaviour of Z/E-2b on hydrolysis (preparation of subst. allylamine Z-3b) and on reactions with HCl-ether (isolation of 4 from Z-2b resp. of 5 and 6 from E-2b) and with NaH were investigated. E-3b is obtained from E-2b after transmetalation with triethylaluminium and subsequent hydrolysis. - The crystalline, betaine like ammonium borates 8a, b are formed by reaction of sodium triethyl(3-diethylamino-1-propynyl)borate (7) with dimethyl sulfate or triethyloxonium tetrafluoroborate.
    Notes: Durch elektrophile Addition von Dimethylmethylenammoniumbromid an Natrium-trialkyl-1-propinylborate Na[R3BC≡CMe] [R=Me (1a), Ät (1b)] erhält man mit 96% Ausbeute Z/E-Gemische (ca. 1:1) von N-(3-Dialkylboryl-2-methyl-3-alkylallyl)dimethylaminen (2a, b). Das unterschiedliche Verhalten von Z/E-2 b bei der Hydrolyse (Darstellung des subst.-Allylamins Z-3b) sowie bei Reaktionen mit HCI-Äther (Gewinnung von 4 aus Z-2b bzw. von 5 und 6 aus E-2b) und mit NaH wird untersucht. E-3b wird aus E-2b nach Ummetallieren mit Triäthylaluminium durch anschließende Hydrolyse gewonnen. - Natrium-triäthyl(3-diäthylamino-1-propinyl)borat (7) liefert mit Dimethylsulfat bzw. mit Triäthyloxonium-tetrafluoroborat die kristallinen, betainartigen Ammoniumborate 8a, b.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3332-3337 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydratisierte Oxokohlenwasserstoffe, II. Darstellung einer neuen Klasse von thermochromen Bor-Heterocyclen aus Octahydroxycyclobutan oder DihydroxybutendisäureDie Reaktion von Octahydroxycyclobutan (2) mit aktiviertem Triethylboran ergibt in geringer Ausbeute unter Ringaufspaltung von 2 das thermochrome 2,6-Diethyl-1,3,5,7-tetraoxa-2,6-dibora-4,8-octalindion (5b). 5b sowie andere Derivate dieser neuen Verbindungsklasse lassen sich aber in hohen Ausbeuten direkt aus Dihydroxyfumarsäure (6) mit verschiedenen Alkyl- oder Arylboranen herstellen. Mit Ausnahme der tert-Butyl- (5f) und der Aryl-Derivate 51, m verändern sämtliche Verbindungen 5, abhängig vom Substituenten, zwischen -5 und 150°C im Festkörper ihre Farbe reversibel von gelb nach farblos.
    Notes: The reaction of octahydroxycyclobutane (2) with activated triethylborane gives a low yield of the thermochromic 2,6-diethyl-1,3,5,7-tetraoxa-2,6-dibora-4,8-octalindione (5b) by ring cleavage of 2. Additional examples of this novel class of compounds have also been prepared directly by reacting dihydroxyfumaric acid (6) with various alkyl- or arylboranes. With the exception of the tert-butyl- (5f) and the aryl derivatives 51, m, the new compounds 5 undergo a temperature dependent colour change (yellow/colourless) in the solid state. The thermochromic transition temperature Tth depends on the substituents and lies between -5 and 150°C.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2022-2034 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Compounds, LIV. 17O NMR Studies of Cyclic Organo-Boron-Oxygen Compounds17O-Chemical shifts (δ17O) of various cyclic organo-boron-oxygen compounds (borolanes, borinanes, 9-borabicyclo[3.3.1]nonanes, boroxins) are reported (Table 1). The δ17O values show that the magnetic screening of oxygen depends upon BO(pp)π-bonds. The contribution of the paramagnetic term σp to the screening (σ) of oxygen is evident from the comparison of δ17O of linear and bent systems, as is true for δ14N values of comparable compounds. Differences between 2-ethyl-1,3,2-dioxaborolanes and 2-ethyl-1,3,2-dioxaborinanes are shown by comparison of the δ17O data of the methyl substituted derivatives.
    Notes: 17O-Chemische Verschiebungen (δ17O) für verschiedene cyclische Organo-Bor-Sauerstoffverbindungen (Borolane, Borinane, 9-Borabicyclo[3.3.1]nonane, Boroxine) werden mitgeteilt (Tab. 1). Die δ17O-Werte belegen die Abhängigkeit der magnetischen Abschirmung des Sauerstoffs von BO(pp)π-Bindungen. Der Beitrag des paramagnetischen Terms σp zur Gesamtabschirmung (σ) wird durch Vergleich der δ17O-Werte linearer und gewinkelter Systeme deutlich, ebenso wie Parallelen zwischen δ17O und δ14N. Unterschiede zwischen 2-Ethyl-1,3,2-dioxaborolanen und 2-Ethyl-1,3,2-dioxaborinanen zeigen sich besonders bei den δ17O-Werten verschiedener methyl-substituierter Derivate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1336-1344 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydratisierte Oxokohlenwasserstoffe, I. Herstellung und Reaktionen von Tetrakis[organoborandiylbis(oxy)]cyclobutanenAus Octahydroxyclobutan (1) erhält man mit verschiedenen Monoorganoboranen in hohen Ausbeuten die Tetrakis[organoborandiylbis(oxy)]-Derivate 2a-d, die mit tertiären Aminen 1:2-sowie 1:4-Additionsverbindungen bilden. Bei der Alkoholyse lassen sich 2a-d in Abhängigkeit von den Organo-Substituenten an den Bor-Atomen partiell und vollständig entborylieren. Man erhält z. B. Tetraalkoxybis[phenylborandiylbis(oxy)]-Derivate des Cyclobutan-Rings (7b, c) oder, infolge Ringöffnung, Dihydroxyfumarsäure-dimethylester (5).
    Notes: Octahydroxycyclobutane (1) reacts with various monoorganoboranes to give in high yields the tetrakis[organoboranediylbis(oxy)] derivatives 2a-d. These react with tertiary amines to yield either 1:2 or 1:4 adducts. Depending on the organo substituents at the boron atoms, alcoholyses of 2a-d result in either partial or complete deborylation giving e.g. tetraalkoxybis[phenyl-boranediylbis(oxy)] derivatives of the cyclobutane ring (7b, c), or, with ring-opening, dimethyl dihydroxyfumarate (5).
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...