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  • 1
    ISSN: 0009-2940
    Keywords: Aminocarbene complexes of iron ; N-Vinylaminocarbene complexes ; π-Allyl,σ-complexes of iron ; N-(2-Propenyl)aminocarbene complexes ; Methylenation of ketene imines by carbene complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic Syntheses with Transition Metal Complexes, 52 1). - N-Vinylaminocarbene and N-(2-Propenyl)aminocarbene Complexes by Addition of Ketene Imines to Carbene Iron ComplexesKetene imines R(Me)C = C = NPh (2, R = Me, Et, i-Pr) form 1 : 1 adducts with the carbene iron complex (CO)4,Fe=C(OEt)Ph (1). The initial step of the reaction involves an attack of the nitrogen atom of 2 at the carbene carbon atom of 1 and a subsequent rearrangement to give N-vinylaminocarbene complexes (E/Z)-4. In a parallel process with different regiochemistry the central carbon of the CCN unit is attached to the carbene carbon to yield π-allyl,σ-complexes (E/Z)-3. Alkylation of 3a with [Et3O]BF4 leads to the formation of a cationic N-(2-propenyl)-aminocarbene complex 6a. Protonation of 4 with trifluoroacetic acid results in a ring contraction to give the four-membered metallacycles 7. X-ray data are reported for prototypes (Z)-4c and 6a.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 655-664 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactive E=C (p—p) π Systems, XIV.  -  Synthesis and Structure of Phosphaalkenes of the Type F3CP=C(F)NR2Perfluoro-2-phosphapropene 1reacts quantitatively with secondary amines R2NH in the molar ratio of 1:2 at temperatures between -120 and -40°C to give (trifluoromethyl)phosphaalkenes of the type F3CP=C(F)NR2 R = Me (2), Et (3), i-pr (4); NR2 = pyrrolidino (5), piperidino (6), 2-methylpiperidino (7, 3-methylpiperidino (8), N-methylanilino (9). Diphenylamine does not react in the same way even at room temperature. The same products are obtained by teh reaction of (CF3)2PH with R2NH and R2NH/NEt3, respectively, in molar rations of 1:3 or 1:1:2. The new compounds 4-9 just as 2 and 3 are stable at room temperature and without exception have Z configuration. The X-ray structure analysis of 1-(dimethylamino)- 1,3,3,3-tetrafluoro-2-phospha-1propene (2) proves the participation of the lone pair on nitrogen in stabilizing the system. The lattice of 2 contains C4H6F4NP molecules with an almost planar CP=C(F)NC2 skeleton. The PC bond distance amounts 1.744(2) Å, the CN bond [1.311(2)Å] is 0.16Å shorter than CN single bonds in amines suggesting a bond order near 2. The reaction of 2With Cr(CO)5(THF) yields the complex Cr(CO)5[F3CP=C(F)NMe2] (10) with P-coordination. In the crystal structure of 10 the CN distance of the coordination. In teh crystal structure of 10 the CN distance of the coordinated ligand is somewhat smaller (1.29 Å) and is slowly transformed to give 2 and the binuclear complex [Cr(CO)5]2F3CP=C(F)NMe2 (11)
    Notes: Perfluor-2-phosphapropen 1reagiert mit sekundären Aminen R2NH im Molverhältnis 1:2 bei Temperaturen zwischen -120 und -40°C quantitativ zu (Trifluormethyl) phosphaalkenen des typs F3CP=C(F)NR2 [R = me(2), Et (3), i-Pr (4); NR2 = Pyrrolidino (5), Piperidino (6), 2-methylpiperidino (7), 3-Methylpiperidino (8), N-Methylanilino (9)]. diphenylamin Setzt sich selbst bei Raumtemperatur nicht in analoger Weise um. Zu den Gleichen Produkten gelangt man durch Umsetzung von (CF3)2PH mit R2NH bzw. R2NH/NEt3 im Molverhältnis 1:3 bzw. 1:1 bzw. 1:1:2. Die neuen Verbindungen 4-9 sind wie 2 und 3 bei Raumtemperatur beständig and besitzen ausnahmslos die Z-Konfiguration. Die Röntgenbeugungsanalyse des 1-(Dimethylamino)-1,3,3,3-tetrafluor-2-phospha-1-propens (2) beweist die beteiligung des freien Elektronenpaars am Stickstoff an der Stabilisierung des Systems. Das Gitter von 2. enthält C4H6F4NP-Moleküle mit fast planarem CP=C(F)NC2-Gerüst. Der PC-Bindungsabstand beträgt 1.744 (2) Å, der CN-Abstand ist mit 1.311(2)Å 0.16Å Kürzer als die CN Einfachbindungen in Aminen und zeigt eine Bindungsordnung nahe 2 an. Die Umsetzung von 2Mit Cr(CO)5(THF) liefert den Komplex CR(CO)5[F3PC=C(F)NMe2] (10) mit P-Koordination. IN der Kristallstruktur von 10ist der CN-abstand des Koordinierten Liganden Geringfügig über (1.29 Å), der PC-Abstand deutlich gröβer (1.80Å) als in 2.10 wandelt sich bei 25°C unter Freisetzung von 2 langsam in den Zweikernkomplex [cr(CO)5]2F3CP=C(F)NMe2 (11) um.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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