- Catalysts for Suzuki polycondensation: Ionic and "quasi-ionic" amphipathic palladium complexes with self-phase-transfer features
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Poly(9,9-dioctylfluorene) (PFO) with Mn values above 100 000 g mol-1 in a toluene/water system and Mn values up to 600 000 g mol-1 in a THF/water system has been obtained by improved Suzuki polycondensation using a new kind of amphipathic palladium catalyst with self-phase-transfer features, which could overcome the disadvantage caused by the immiscible biphasic mixture and accelerate the transmetalation step (see figure). Copyright
- Li, Jing,Fu, Hongwei,Hu, Pan,Zhang, Zilong,Li, Xiao,Cheng, Yanxiang
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supporting information
p. 13941 - 13944,4
(2020/09/16)
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- High-yield synthesis and crystal structure determination of sodium triphenylphosphane monosulfonate (TPPMSNa)
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A. simple, high-yield synthesis is described that leads to the sodium salt of monosulfonated triphenylphosphane (TPPMSNa) as a pure product in large quantities without complicated workup techniques. The single-crystal X-ray structure of TPPMSNa-2.5H2O is reported. The structure is built up by alternating layers of aquated sodium sulfonate units and hydrophobic triphenyl units. Thermogravimetric analyses show the loss of one molecule of water at 70 and. one at 105 °C. Thermal decomposition occurs at temperatures above 400 °C. The anhydrous ligand is hygroscopic. The preparation of the free acid TPPMSH starting from the sodium, salt is also reported. TPPMSH is an extremely hygroscopic solid that could not be isolated in the crystalline form.
- Karschin, Arndt,Klaeui, Wolfgang,Peters, Wilfried,Spingler, Bernhard
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experimental part
p. 942 - 946
(2010/06/18)
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- Ionic interaction as a powerful driving force for the formation of heterobidentate assembly ligands
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An ionic interaction has been used for the first time to assemble monophosphane ligands. NMR spectroscopy and X-ray studies show that cationic and anionic triphenylphosphane derivatives form ion pairs and subsequently act as a ligand in various transition-metal complexes. The position of the ionic functional groups allows both cis and trans coordination of the novel assembly ligand in square-planar transition-metal complexes.
- Gulyas, Henrik,Benet-Buchholz, Jordi,Escudero-Adan, Eduardo C.,Freixa, Zoraida,Van Leeuwen, Piet W. N. M.
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p. 3424 - 3430
(2008/01/06)
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- PHOSPHINES SULFONEES ASYMETRIQUES V. CINETIQUE DE SULFONATION DES PHOSPHINES
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The sulfonation of 1,2-, 1,3- and 1,4-diphosphines (dppe, dppp, dppb) is studied.It is shown that the sulfonation is faster for 1,4-diphophines than for 1,3- and 1,2-diphosphines.The conditions affording the tetrasulfonation are described, and also those allowing the obtention of a mixture containing large amounts of disulfonated diphosphines.This study is extended to chiral diphosphines (Cyclobutanediop, BDPP, Chiraphos).
- Lecomte, L.,Sinou, D.
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p. 239 - 251
(2007/10/02)
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