P−P Condensation and P−N/P−P Bond Metathesis: Facile Synthesis of Cationic Tri‐ and Tetraphosphanes
作者:Clemens Taube、Kai Schwedtmann、Medena Noikham、Ekasith Somsook、Felix Hennersdorf、Robert Wolf、Jan J. Weigand
DOI:10.1002/anie.201911483
日期:2020.2.24
[LC R P((PhP)2 C2 H4 )][OTf] (4 a,b[OTf]) and [LC iPr P(PPh2 )2 ][OTf] (5 b[OTf]) were prepared from the reaction of imidazoliumyl-substituted dipyrazolylphosphane triflate salts [LC R P(pyr)2 ][OTf] (3 a,b[OTf]; a: R=Me, b=iPr; LC R =1,3-dialkyl-4,5-dimethylimidazol-2-yl; pyr=3,5-dimethylpyrazol-1-yl) with the secondary phosphanes PhP(H)C2 H4 P(H)Ph) and Ph2 PH. A stepwise double P-N/P-P bond metathesis
[LC RP((PhP)2 C2 H4 )][OTf] (4 a,b[OTf]) 和 [LC iPr P(PPh2 )2 ][OTf] (5 b[OTf]) 由以下反应制备咪唑鎓基取代的二吡唑基膦三氟甲磺酸盐 [LC RP(pyr)2 ][OTf] (3 a,b[OTf]; a: R=Me, b=iPr; LC R =1,3-二烷基-4,5-二甲基咪唑-2-基;pyr=3,5-二甲基吡唑-1-基)与仲膦PhP(H)C2 H4 P(H)Ph)和Ph2 PH。当反应 3 时,观察到双 PN/PP 键逐步复分解为链状四膦-2,3-二鎓三氟甲磺酸盐 [(Ph2 P)2 (LC Me P)2 ][OTf]2 (7 a[OTf]2 ) a[OTf] 与二膦 P2 Ph4 。用选定的造币金属盐[Cu(CH3 CN)4 ]OTf、AgOTf和AuCl(tht)(tht=四氢噻吩)探讨了5 b[OTf]的配位能力。对于