Library

X
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
    Chiral polymethine dyes. Part 6.Presented in part at the Third Symposium on Iminium Salts, held at Rechenberg, Germany, September 17-19, 1997 Synthesis, absolute configuration, UV/Vis spectroscopic, and chiroptical properties of Chiral Tri- and Pentamethinium Cyanine Dyes with 1,2,3,4-tetrahydro-3,6-dimethylquinolyl end groups (1998)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 340 (1998), S. 513-529 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Starting with monochiral 1,2,3,4-tetrahydro-3,6-dimethyl quinoline 14a,b, (Schemes 1 and 2), we have synthsized the new chiral, symmetrical and unsymmetrical, tri- and pentamethinium streptocyanine dyes 2a, (Scheme 8), 4a, (Scheme 5), and 5a,b, (Scheme 4), resp. 9a, (Scheme 6), 10a,b, (Scheme 4), and 11a, (Scheme 7) with one or two stereogenic centers in the two heterocyclic end groups. The absolute configuration of 14a,b, and thus the absolute configuration of all monochiral polymethinium dyes derived from 14a,b, has been determined by a single-crystal X-ray analysis of its 4-bromobenzenesulfonyl derivative 17a, (Scheme 1 and Fig. 1). The UV/Vis spectroscopic and chiroptical properties of the new polymethinium dyes have been studied for the first time and compared with that of similar streptocyanine dyes synthesized earlier (Tables 1 and 2) in order to find possible correlations between chiroptical properties and molecular structure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19983400604
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Phenyl- und Vinyliodonio-cyclopentadienide (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2099-2107 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phenyl- and Vinyliodonio-cyclopentadienidesThe cyclopentadienyl anions 1-4 stabilized by electronegative substituents R1-R4 react with the (diacetoxyiodo)benzenes 5-12 and with 2-(diacetoxyiodo)vinyl chloride (16) to give the Iodonium ylides 13 and 17-19, resp. Tetracyanocyclopentadienide anion (14), which is less nucleophilic than 1-4, reacts in the same way in the presence of mineral acids. The 1H NMR and 13C NMR spectra of the ylides are given.
    Notes: Die durch elektronegative Substituenten R1-R4 stabilisierten Cyclopentadienyl-Anionen 1-4 reagieren mit den (Diacetoxyiodo)benzolen 5-12 bzw. mit 2-(Diacetoxyiodo)vinylchlorid (16) zu den Iodonium-Yliden 13 bzw. 17-19. Das im Vergleich zu 1-4 schwächer nucleophile Tetracyancyclopentadienyl-Anion (14) reagiert in Gegenwart von Mineralsäuren in gleicher Weise. Die 1H-NMR- und 13C-NMR-Spektren der Ylide werden angegeben.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110605
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Cyclopentadienid-Synthesen mit Iodonium-Yliden: Cyclopentadienide mit Schwefel, Selen, Phosphor und Arsen als Oniumzentrum (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1267-1271 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclopentadienide Syntheses with Iodonium Ylides: Cyclopentadienides with Sulfur, Selenium, Phosphorus, and Arsenic as Onium CenterThe aryliodonio-cyclopentadienides 1 react with thioethers or diphenyl selenide at temperatures of 65 - 140°C to give the corresponding sulfonio- or selenonio-cyclopentadienides 2. Thioureas yield the isothiuronium betaines 4. The reactions of 1 with triphenylphosphane and -arsane to the phosphonio- and arsonio-cyclopentadienides 6 require temperatures of 140 - 150°C and catalysis by Cu compounds.
    Notes: Die Aryliodonio-cyclopentadienide 1 reagieren mit Thioethern oder Diphenylselenid bei Temperaturen von 65-140°C zu den entsprechenden Sulfonio- und Selenonio-cyclopentadieniden 2. Thioharnstoffe ergeben die Isothiuronium-Betaine 4. Die Reaktionen von 1 mit Triphenylphosphan und -arsan zu den Phosphonio- und Arsonio-cyclopentadieniden 6 benötigen Temperaturen von 140-150°C und Katalyse durch Cu-Verbindungen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120420
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...