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Diphenylethin
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Diphenylethin ist die chemische Verbindung C6H5βCβ‘CβC6H5. Das MolekΓΌl besteht aus zwei Phenylresten, die an beide Enden einer alkinischen Dreifachbindung gebunden sind. Die Verbindung kann deshalb sowohl als Ethinderivat als auch als Benzolderivat angesehen werden.
Diphenylethin ist ein farbloser kristalliner Feststoff, der sowohl als Grundbaustein in der organischen Synthese als auch als Ligand in der Organometallchemie hΓ€ufig verwendet wird.
Contents
β’ Herstellung
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Herstellung
Diphenylethin kann auf verschiedene Weisen hergestellt werden:
β’ Kondensation von Benzil mit Hydrazin liefert das Dihydrazon, welches dann mit Quecksilber(II)-oxid oxidiert wird.cite-ref-cv4p0377-3-0[3]
β’ Stephens-Castro-Kupplung von Iodbenzol mit dem Kupfersalz des Phenylethins.
Bedeutende Derivate
β’ Die Reaktion mit Benzalchlorid in Gegenwart von Kalium-tert-butanolat liefert das 3-Alkoxycyclopropen, welches sich in Bromwasserstoff zu Triphenylcyclopropeniumbromid umwandelt.cite-ref-5[5]
Einzelnachweise
cite-note-orgsyn-3-350-11. Lee Irvin Smith, M. M. Falkof: Diphenylacetylene In: Organic Syntheses. 22, 1942, S. 50, doi:10.15227/orgsyn.022.0050; Coll. Vol. 3, 1955, S. 350 (PDF).
cite-note-sigma-21. Datenblatt Diphenylacetylene, 98 % bei Sigma-Aldrich, abgerufen am 10. Mai 2012 (PDF).
cite-note-cv4p0377-33. β Arthur C. Cope, Douglas S. Smith, Robert J. Cotter: Diphenylacetylene In: Organic Syntheses. 34, 1954, S. 42, doi:10.15227/orgsyn.034.0042; Coll. Vol. 4, 1963, S. 377 (PDF).
cite-note-44. β Louis F. Fieser: Hexaphenylbenzene In: Organic Syntheses. 46, 1966, S. 44, doi:10.15227/orgsyn.046.0044; Coll. Vol. 5, 1973, S. 604 (PDF).
cite-note-55. β Ruo Xu, Ronald Breslow: 1,2,3-Triphenylcyclopropendium Bromide In: Organic Syntheses. 74, 1997, S. 72, doi:10.15227/orgsyn.074.0072; Coll. Vol. 9, 1998, S. 730 (PDF).