Phosphonium Salts of 1,8-Bis(diphenylphosphino)naphthalene: Molecular Structures and NMR-spectroscopic Studies
作者:Atilla Karaçar、Volker Klaukien、Matthias Freytag、Holger Thönnessen、Jan Omelanczuk、Peter G. Jones、Rainer Bartsch、Reinhard Schmutzler
DOI:10.1002/1521-3749(200112)627:12<2589::aid-zaac2589>3.0.co;2-r
日期:2001.12
deflects the substituent groups to opposite faces of the naphthalene plane [splay angles: +11.4° (2 b), +13.6° (4); +16.7° (5)]. In solution 2 b, 4, and 5 were dynamic according to 31P, 13C, and 1H NMR spectroscopy. The fluxionality of 2 b involves rapid intramolecular proton exchange between the two phosphorus atoms, which slows down at low temperature, whereas the dynamic behaviour of 4 and 5 is interpreted
具有代表性的系列二膦单鏻盐 [1-Ph2P(C10H6)-8-PRPh2]+X– (2 b: R = H, X = CF3SO3; 4: R = Me, X = CF3SO3; 5: R = C6H5CH2 = Bn, X = Br) 是通过在 +20 °C 的 CH2Cl2 中用化学计量的 HSO3CF3 或 CH3SO3CF3 和在 +80°C 的甲苯中用 C6H5CH2Br 处理 1,8-双(二苯基膦基)萘 (dppn, 1) 来制备的. 他们的 X 射线晶体结构表明没有证据表明与 P P+ 相互作用。相反,空间排斥使取代基偏转到萘平面的相反面[展开角:+11.4° (2 b),+13.6° (4);+16.7° (5)]。根据 31P、13C 和 1H NMR 光谱,溶液 2b、4 和 5 是动态的。2 b 的流动性涉及两个磷原子之间的快速分子内质子交换,在低温下会减慢,而 4