| | 1 | Author
| Hubert Schmidbaur, Thomas Costa | Requires cookie* | | | Title
| Synthese eines Doppel-Carbodiphosphorans und seiner Vorstufen Synthesis of a Double-Carbodiphosphorane and its Precursors  | | | | Abstract
| The reaction of 1,4-dibromobutane with bis(diphenylphospliino)methane (1) yields two products, one of which is identified as butane-l,4-bis[diphenyl(diphenylphosphinomethyl)-phosphonium bromide] (3 a). Transylidation of this bis-phosphonium salt using two equiv-alents of (CH3)3P = CH2 affords the bis-ylide [CH2CH2P(C6H5)2 = CH-P(C6H5)2]2 (4) in high yields. This conversion can be reversed on treatment of 4 with etheral HCl (to give 3b). Methylation of 4 with CH3I occurs at phosphorus, however, and produces the bis-semiylide salt (5), [CH2CH2P(C6H5)2CHP(C6H5)2CH3]2 2e 2Iö. Transylidation of 5 (again with (CH3)3P = CH2) leads to the bis-carbodiphosphorane (6), [CH2CH2P(C6H5)2 = C = P(C6H5)2CH3]2. All compounds were characterized by elemental and detailed NMR analyses. The second product of the above quaternisation reaction is a cyclic bis-phosphonium salt (2) with a seven-membered ring structure. | | | |
Reference
| Z. Naturforsch. 37b, 677—79 (1982); eingegangen am 9. Februar 1982 | | | |
Published
| 1982 | | | |
Keywords
| 1, 4-Dibromobutane, Transylidation, Carbodiphosphorane, Bis-carbodiphosphorane, Ylides | | | |
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| default:Reihe_B/37/ZNB-1982-37b-0677.pdf | | | | Identifier
| ZNB-1982-37b-0677 | | | | Volume
| 37 | |
| 3 | Author
| FouadM. Soliman, M. Edhat, M. Said | Requires cookie* | | | Title
| Chemistry of Phosphorus Ylides, 11 [1] Reactions with Phosphacumulenes, V: The Reaction of Phosphoranes with Hydroxyxanthenone and Hydroxyquinoline Mannich Bases. Novel Synthesis for Pyranones, Pyranthiones, Phosphoranylidenes | | | | Abstract
| The reaction o f 1-hydroxyxanthenone (1) and hydroxyquinoline (10, 13) Mannich bases with the reactive phosphacumulated ylides (2), represents a new way for the synthesis o f the pyranones and pyranthiones (5, 11, 14). On the other hand, the stabilized phosphorus ylides (6) affect the transylidation o f the Mannich base (1) to the corresponding phosphoranylidenes (9). The structure o f the resulting new com pounds has been confirmed through elemental anal ysis and spectroscopic results (IR, 'H, 3IP N M R and MS). | | | |
Reference
| Z. Naturforsch. 46b, 1105—1109 (1991); received Dezember 17 1990 | | | |
Published
| 1991 | | | |
Keywords
| Wittig Reagents, Pyranones, Pyranthiones, Transylidation, Phosphoranylidenes | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1105.pdf | | | | Identifier
| ZNB-1991-46b-1105 | | | | Volume
| 46 | |
| 4 | Author
| G. Jochem, A. Schmidpeter, H. Nöth | Requires cookie* | | | Title
| Bis(triphenylphosphoniumyIidyl)phosphane Bis(triphenylphosphoniumylidyl)phosphanes | | | | Abstract
| Bis(ylidyl)phosphanes can be prepared from ylides and dichlorophosphanes or from bis-(ylidyl)phosphenium chlorides and organolithium compounds. By substituting in bis(ylidyl)-phosphenium chlorides the chloride ion for more basic anions, a large variety o f bis(ylidyl)-phosphanes is accessible. They can be protonated at the ylidic carbon atoms, but alkylated and oxidized at the central phosphorus atom. A s shown by 3IP NM R in solution and by X-ray investigation of the crystal, the lone pair at the tervalent phosphorus is generally oriented synperiplanar to both phosphonio groups. | | | |
Reference
| Z. Naturforsch. 51b, 267—2 (1996); eingegangen am 10. Juli 1995 | | | |
Published
| 1996 | | | |
Keywords
| Ylides, Transylidation, Phosphenium Ions, M ichaelis Arbusov Rearrangement, Diphosphanes | | | |
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| default:Reihe_B/51/ZNB-1996-51b-0267.pdf | | | | Identifier
| ZNB-1996-51b-0267 | | | | Volume
| 51 | |
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