ZfN: Search Results

1	Author	N. Orbert, K. Uhn, M. Anfred, Steim Ann, Gerd Weyers, Herrn	Requires cookie*
	Title	Synthese und Eigenschaften von l,3-Diisopropyl-4,5-dimethylimidazolium- 2-car boxy lat. Ein stabiles Carben-Addukt des Kohlendioxids [1]
	Abstract	The reaction of 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (5) with C 0 2 gives the imidazolium-2-carboxylate 6 . The compound can be transformed into the salts of its corresponding Broenstedt acid 8 . The cationic acid chloride 10a is obtained from 6 and thionyl chloride. Chemical properties and spectroscopic data indicate 6 to be less basic than its anionic counterparts, e. g. PhC02 . The X-ray structure of
	Reference	Z. Naturforsch. 54b, 427—433 (1999); eingegangen am 27. November 1998
	Published	1999
	Keywords	Carbenes, Imidazoles, Carboxylic Acids, X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0427.pdf
	Identifier	ZNB-1999-54b-0427
	Volume	54

2	Author	Norbert Kuhn, Manfred Steimann3, Gerd Weyers3, Gerald Henkelh, Herrn	Requires cookie*
	Title	l,3-DHSopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinat, ein neuartiges Retain [1] 1,3-Diisopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinate, a Novel Betaine [1]
	Abstract	The imidazolium-2-amidinate 6 is obtained from the reaction of 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4) with diisopropylcarbodiimide (5) as stable solid. Overcrow ding causes a lowered symmetry of the amidinate fragment indicated both by structural and NMR data. The strongly basic properties of 6 allow facile protonation with HC1 to the cationic amidine derivatives 7 and 8 . The ketoamidine 10 is formed by a ring opening reaction of 6 with water. I he X-ray structures of 6 and 10 are reported
	Reference	Z. Naturforsch. 54b, 434—440 (1999); eingegangen am 21. Dezember 1998
	Published	1999
	Keywords	Amidines, Carbenes, Carbon Diimides, Imidazoles, X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0434.pdf
	Identifier	ZNB-1999-54b-0434
	Volume	54

3	Author	Norbert Kuhn, Elke Niquet, Manfred Steimann, Isabel Walker	Requires cookie*
	Title	Methoxyalky 1-funktionalisierte 2,3-Dihy droimidazol-2-ylidene [ 1 ] Methoxyalkyl Functionalized 2,3-Dihydroimidazol-2-ylidenes [1]
	Abstract	The 2,3-dihydro-l,3-di(methoxyalkyl)imidazol-2-ylidenes are obtained from the correspon ding cyclic thioureas and potassium. With CS2, the imidazolium dithiocarboxylates are formed. The results of X-ray structure determinations of two of these products are reported.
	Reference	Z. Naturforsch. 54b, 1181—1187 (1999); eingegangen am 8. Juni 1999
	Published	1999
	Keywords	Carbenes, Imidazoles, Dithiocarboxylates, X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-1181.pdf
	Identifier	ZNB-1999-54b-1181
	Volume	54

4	Author	AnthonyJ. Arduengo, JensR. Iiia, Fredric Goerlicha, WilliamJ. Davidsonb, Marshall5	Requires cookie*
	Title	Carbene Adducts of Dimethylcadmium
	Abstract	The first examples of carbene-cadmium complexes are reported from the reactions of a variety of imidazol-2-ylidenes or imidazolin-2-ylidenes with dimethylcadmium. Four new carbene complexes are characterized by NMR spectroscopy ('H , i?C and 1 n Cd). The cadmium centers are strongly shifted downfield (100 -1 5 0 ppm) by interaction with the carbenes. X-ray structures are reported for three carbene-cadmium 1:1 adducts. The cadmium centers exhibit distorted trigonal-planar geometries in which the carbene ligands have an average 18.2 pm longer bond distance to cadmium compared to the methyl groups. The planes of cadmium coordination are twisted with respect to the plane of the imidazole ring. The more basic imidazolin-2-ylidene is shown to displace imidazol-2-ylidenes from the cadmium center.
	Reference	Z. Naturforsch. 54b, 1350—1356 (1999); received June 16 1999
	Published	1999
	Keywords	Carbene, Cadmium, Ylide, Carbene Complex, Imidazol-2-ylidene
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-1350.pdf
	Identifier	ZNB-1999-54b-1350
	Volume	54