Beiträge zur Chemie des Phosphors, 78: 1,2,3‐Triphenyltriphosphan

Abstract

Contributions to the Chemistry of Phosphorus, 781s2) 1,2,3-TriphenyltriphosphaneAmong the disproportionation products of 1,2-diphenyldiphosphane (I), 1,2,3-triphenyltriphosphane (2) could be enriched up to the maximum concentration of =: 50% with respect to the total phosphorus. 2 was identified by the 31P{'H}NMR spectrum that exhibits, in the region of openchain triphosphanes, two A,B and one ABC spin system for the three diastereomers, of which the NMR parameters are reported. Contrary to results given in the literature, 2 is not stable at room temperature. but disproportionates to give lower and higher homologues of 1111' scries H(PPh),,H as well as cyclic phenylphosphanes, especially (PPh),.

μ-[Tricarbonyl(1,2,3-triphenyltriphosphane-P 2)nickel(0)-P 1,P 3]-bis[pentacarbonylmolybdenum(0)]

“…2). Baudler, Koch & Carlsohn, 1978) whereas our compound is perfectly stable. We are rather inclined to believe that the interaction of the P lone pairs in free polyphosphanes tends to destabilize the system, either by electrostatic or zr-antibonding interactions.…”

Catalytic PH Activation by Ti and Zr Catalysts

“…[40,45,46] In addition, a series of minor peaks located between d À35 and À70 ppm have been tentatively assigned to Ph(H)PP(Ph)P(Ph)P(H)Ph and higher oligomers Ph(H)PA C H T U N G T R E N N U N G (PPh) n P(H)Ph. [46,47] Literature precedent has shown disproportionation of (PhPH) 2 affords PhPH 2 , cyclic oligomers (RP) n and Ph(H)PA C H T U N G T R E N N U N G (PPh) n P(H)Ph (predominantly n = 3). [46] Upon prolonged heating three additional signals appeared which were assigned to (PPh) 4 , [48] (PPh) 5 [49] and (PPh) 6 .…”