16605-03-1Relevant articles and documents
Dinuclear Phosphine-Amido [Rh2(diene){μ-NH(CH2)3PPh2}2] Complexes as Efficient Catalyst Precursors for Phenylacetylene Polymerization
Angoy, Marta,Jiménez, M. Victoria,García-Ordu?a, Pilar,Oro, Luis A.,Vispe, Eugenio,Pérez-Torrente, Jesús J.
, p. 1991 - 2006 (2019)
Dinuclear phosphine-amido, [Rh2(diene){μ-NH(CH2)3PPh2}2], and cationic phosphine-amino complexes, [Rh(diene){Ph2P(CH2)3NHR}]+ (diene = cod, nbd, tfb) and [Rh{Ph2P(CH2)3NHR}2]+, have been prepared from the corresponding amino-functionalized phosphines Ph2P(CH2)3NHR (R = H, Me) and suitable rhodium(I) precursors. The dinuclear [Rh2(diene){μ-NH(CH2)3PPh2}2] complexes bearing π-acceptors diene ligands such as nbd or tfb exhibit a remarkable catalytic activity in phenylacetylene (PA) polymerization affording stereoregular polyphenylacetylenes with, unlike the cod precursor, unimodal molar mass distributions of very high molecular weights, Mw up to ≈ 1.2 × 106, and moderate polydispersity indexes. These complexes are more active than the mononuclear phosphino-anilido [Rh(diene){Ph2P(C6H4)NMe}] complexes, which are in turn more active than the cationic complexes [Rh(diene){Ph2P(CH2)3NHMe}]+, [Rh(nbd){Ph2P(CH2)3NH2}]+, and [Rh(nbd){Ph2P(C6H4)NHMe}]+ bearing the same diene ligand. In contrast, complexes [Rh{Ph2P(CH2)3NHR}2]+ (R = H, Me) without a diene ligand have been found to be inactive in PA polymerization. The excellent catalytic performance of [Rh2(diene){μ-NH(CH2)3PPh2}2] (diene = nbd, tfb) complexes is a consequence of the mode of activation of PA that likely results in the formation of unsaturated alkynyl species [Rh(diene)(CC-Ph)L] (L = PA, THF), which may be competent for PA polymerization.
Phosphorus-based functional groups as hydrogen bonding templates for rotaxane formation
Ahmed, Rehan,Altieri, Andrea,DSouza, Daniel M.,Leigh, David A.,Mullen, Kathleen M.,Papmeyer, Marcus,Slawin, Alexandra M. Z.,Wong, Jenny K. Y.,Woollins, J. Derek
supporting information; experimental part, p. 12304 - 12310 (2011/10/01)
We report on the use of the hydrogen bond acceptor properties of some phosphorus-containing functional groups for the assembly of a series of [2]rotaxanes. Phosphinamides, and the homologous thio- and selenophosphinamides, act as hydrogen bond acceptors t
Preparation of a Nafion-Teflon bimembrane-supported palladium catalyst and its use in the Heck reaction
Li, Yangzhou,Li, Zhiming,Li, Feng,Wang, Quanrui,Tao, Fenggang
, p. 6159 - 6162 (2007/10/03)
A novel palladium catalyst supported on the Nafion membrane, reinforced with poly(tetrafluoroethylene) fiber, has been prepared. The catalyst exhibits high activity and stability in the Heck arylation reactions of aryl iodides with olefins and Sonogashira couplings with phenylacetylene, and can be readily recovered and reused twenty times without significant loss of activity.
