D. Houalla

Per - bicyclophosphoranylation d'alditols

Abstract Reaction of bicyclophosphane 1 with glycol 2 , glycerol 3 , erythritol 4 , L(-)arabitol 5 and dulcitol 6 leads to the corresponding per-alkoxybicyclophosphoranes 2p - 6p which are in tautomeric equilibrium with the phosphates forms 2p ′ - 6p ′.The amount of these latters increases regularly from traces to 24%.

Opening of the P–N bond of bicyclic phosphoranes. Synthesis and X-ray crystal and molecular structure of rhodium complexes of perhydro-1,3,6,2-dioxazaphosphocine

µ-Chloro binuclear rhodium(I) complexes trap the bidentate PIII–NIII tautomers of bicyclic phosphoranes containing a P–H bond to give monomeric rhodium(I) complexes, two of which [(5a) and (5b)] have been characterised by X-ray crystallography.

Bidentate P(III)−N(III) — Rh(I) Complexes : Synthesis from Bicyclophosphoranes and Applications in Homogeneous Catalysis

The purpose of this work is to prepare complexes of low-valent transition metals where both a phosphorus (III) and an amino groups are coordinated to the metal and to survey their catalytic properties. According to Roundhill and Rauchfuss4, such compounds could be of direct importance to homogeneous catalysis. For example, one can expect that coordination of the amino arm can confer a high electron density on the central atom. Thus, it was observed 5 that the order of effectiveness for the catalytic hydrogenation of 1-hexene is Open image in new window In addition, since low-valent complexes are usually stabilized by π-acceptor ligands, it is likely that the coordinated amino group will undergo facile substitution by π-acceptor ligands. This propensity to substitution has been again demonstrated by Roundhill and co-workers 6 who reported the ready carbonylation of the complex {Rh(PN)2}PF6, where PN is o-(diphenylphosphino)-N,N-dimethyl-aniline, to {Rh(PN)2(C0)2}PF6.

1H Chemical Shifts of Protons Directly Bonded to Phosphorus

Over 100 δH values of H- (P) obtained in our laboratory, as well as values from the literature, have been tabulated and discussed. These data are useful, not only in the study of molecules containing a P-H bond but also, more generally, in the determination of the factors which influence the value of proton chemical shifts.