LENSINK, C.;DE, RUITER, B.;VAN, DE, GRAMPEL, J. C., J. CHEM. SOC. DALTON TRANS., 1984, N 8, 1521-1526
作者:LENSINK, C.、DE, RUITER, B.、VAN, DE, GRAMPEL, J. C.
DOI:——
日期:——
Geminal bis[(triphenylphosphoranylidene)amino]cyclotriphosphazenes synthesis: substitution reactions, and nuclear magnetic resonance spectra
作者:Cees Lensink、Barteld de Ruiter、Johan C. van de Grampel
DOI:10.1039/dt9840001521
日期:——
amino ligand are readily converted into the corresponding (triphenylphosphoranylidene)amino (–NPPh3) derivatives by means of an excess of triphenylphosphine–tetrachloromethane in an acetonitrile–triethylamine medium (Appel reaction). Thus prepared, N3P3Cl4(NPPh3)2 reacts with dimethylamine in various solvents according to a geminal substitution pattern; this is an indication of SN1-type reactions, as
带有氨基配体的环三磷腈很容易在乙腈-三乙胺介质中通过过量的三苯膦-四氯甲烷转化成相应的(三苯基磷亚基)氨基(-N PPh 3)衍生物(Appel反应)。如此制备的N 3 P 3 Cl 4(N PPh 3)2根据双取代的模式在各种溶剂中与二甲胺反应。这是S的指示Ñ 1型反应,作为配体的强给电子特性的结果。最终取代产物N 3 P 3(NMe 2)4也由N 3 P 3(NMe 2)4(NH 2)2制备的(N PPh 3)2根据其制备方法被分离为其HCl或2HCl加合物。在这两个加合物中,质子均与环氮原子相连,并且在1 H和31 P nmr变温下的测量结果表明,在高温下质子性行为。根据配体的供电子能力,讨论了衍生物的31 P nmr参数范围内的趋势。