Sur deux phosphanes bycycliques

Syntheses, Characterization and Reactivity of Dibenzobicyclic Phosphoranes 10-P-5

“…Compound 1 has a single signal at 31P S = -20. 4 ppm indicative of a 10-P-5 bonding system, similar to dichlorophosphorane 15a (Figure 4) prepared from the di-rerr-butyldiketoamine" (31P S = -24.9 ppm). The 'H and I'C NMR spectra show half of the total carbon atoms and protons which suggests a symmetric molecule, (Tables 1-11).…”

Recent developments in the chemistry of non-trigonal pnictogen pincer compounds: from bonding to catalysis

“…Initial reports on group 15 elements bearing geometrically constrained tridentate, meridionally coordinating pincer ligands were published by Arduengo, Baccolini, Contreras, Schmidpeter and Wolf. [20][21][22][23][24][25][26][27][28][29] The addition of PnCl 3 (Pn ¼ P, As, Sb, Bi) to HN(CH 2 CH 2 C(O)R) 2 (R ¼ Ad, t Bu, Ph) yielded geometrically constrained pnictogen species coordinated by an ONO pincer ligand (I, Pn ¼ P, Scheme 2). While the lighter elements showed full conversion upon addition of one equivalent of ligand, the reaction with BiCl 3 required three equivalents to yield a 9-coordinate species.…”

Functionalization of Poly[(alkoxy)phosphazenes]: Synthesis and Characterization of Poly(phosphazenes) Containing Hydroxyl Groups

“…This bicyclophosphane 8 reacts differently depending on whether the OH groups come from alcohol or from water. 28 In 31P NMR, the phosphorus atoms of the reaction products then have different chemical shifts (<5 = -35 ppm after reaction with alcohols, 8a; ó = +18 ppm, 8b, and <5 = -7 ppm 8c, after reaction with water29) (Scheme 1). In our case, polymer 6 or 7 reacts with 8 giving 9 according to (3).…”