| | 1 | Author
| H. Möhrle, Chr Kamper, R. Feil | Requires cookie* | | | Title
| Comparison between the Amino and the Hydroxy Neighbour Group in Dehydrogenation Reactions  | | | | Abstract
| The mercuric EDTA dehydrogenation of the isomeric 1,2-and 2,1-(phenyl-pyrrolidino)-ethanols yields with two electron removal the corresponding oxazolidines. The analogous 1,2-and 2,l-(amino-phenyl)pyrrolidines by double dehydrogenation produce the amidines resp. by subsequent hydrolysis the lactams. An explanation for the different course of the reaction is given. | | | |
Reference
| (Z. Naturforsch. 31b, 99—105 [1976]; eingegangen am 23. September 1975) | | | |
Published
| 1976 | | | |
Keywords
| Mercuric EDTA Dehydrogenation, Neighbouring Effect, Oxazolidines, Amidines | | | |
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| default:Reihe_B/31/ZNB-1976-31b-0099.pdf | | | | Identifier
| ZNB-1976-31b-0099 | | | | Volume
| 31 | |
| 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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| default:Reihe_B/54/ZNB-1999-54b-0434.pdf | | | | Identifier
| ZNB-1999-54b-0434 | | | | Volume
| 54 | |
| 3 | Author
| Hans-Jörg Hemmerling, Margarete Janoschka, Hartmut Wunderlich | Requires cookie* | | | Title
| Amidinadditionsprodukte des 1,2,3-Indantrionhydrats: Synthese und Strukturzuordnung durch Kristallstrukturanalyse, spektrale Daten und Blei(IV)acetatoxidation Products o f Am idinaddition to 1,2,3-Triketohydrindenhydrat: Synthesis and Determination by Crystal Structure, Spectral Data and Oxidation with Lead(IV)acetate | | | | Abstract
| The addition o f amidines to 1,2,3-triketohydrindenhydrat gives cyclic dihydroxyindenoimi-dazoles. From N-substituted amidines mixtures o f regioisomeric derivatives were obtained. Analysis o f crystals revealed the major product o f 2 k to be 4 k. They belong to the monoclinic space group P 2 ,/c (a = 889.1(2); b = 1186.6(3); c = 2783.5(7) pm; ß = 91.26(2)°) with Z = 8 molecules including four molecules o f ethanole per unit cell. These results were confirmed by oxidation with lead(IV)acetate, which lead to derivatives o f isoindols. | | | |
Reference
| Z. Naturforsch. 48b, 1094—1104 (1993); eingegangen am 26. März 1993 | | | |
Published
| 1993 | | | |
Keywords
| Indeno[l, 2-d]im idazoles, Triketohydrinden, Crystal Structure, Amidines, Isoindoles | | | |
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| default:Reihe_B/48/ZNB-1993-48b-1094.pdf | | | | Identifier
| ZNB-1993-48b-1094 | | | | Volume
| 48 | |
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