142083-83-8Relevant academic research and scientific papers
Novel Bonding of Tertiary Diphosphines to Metal Ring Carbonyl Complexes
Brown, David A.,Burns, John,El-Gamati, Ibrahim,Glass, William K.,Kreddan, Khaled,et al.
, p. 701 - 702 (1992)
Tertiary diphosphines form complexes with various metal ring carbonyl cations of new and novel structural types including ring adducts, e.g. 4-C7H9-5-exo-η1-PPh2CH2PPh2)Fe(CO)3>BF4 diphosphine bridged ring dimers, e.g.Ph2P(CH2)2PP
Substitution and addition reactions of the (CO)3(η7-tropylium)M cations (M = Cr, Mo, W) with tertiary diphosphines
Brown, David A.,Burns, John,Glass, William K.,Cunningham, Desmond,Higgins, Tim,McArdle, Patrick,Salama, Mabrouk M.
, p. 2662 - 2667 (2008/10/08)
The reactions of the title compounds I-III, [(η7-C7H7)M(CO)3]BF4 (M = Cr, Mo, and W, respectively), with the diphosphines PPh2(CH2)nPPh2 (n = 1-4) at low temperatures (-40 to -60°C) form two new series of complexes which are quite different from previous carbonyl substitution products. The first series (IV-VI) formed by the diphosphines (n = 1-3) comprise 7-exo ring adducts involving the bonding of only one phosphorus atom of the diphosphine to ring carbon atom 7 of I. The second series (VII and VIII) are diphosphine ring linked dimers, e.g. [(7,7′-exo-dppb){η6-C7H7)Cr(CO) 3}2] [BF4]2, for which X-ray crystallography confirms a diphosphine linked ring-ring structure with the Cr(CO)3 moieties situated on opposite sides of the ring systems. The ring C-phosphorus bond length of 1.852 A? indicates a relatively weak bond, consistent with facile cleavage of these adducts on reaction with nucleophiles such as hydride.
