Synthesis, structures, and reactivity of weakly coordinating anions with delocalized borate structure: the assessment of anion effects in metallocene polymerization catalysts.
作者： Jiamin Zhou , Simon J. Lancaster , Dennis A. Walker , Stefan Beck , Mark Thornton-Pett
DOI: 10.1021/JA002820H
关键词:
摘要: The formation of adducts tris(pentafluorophenyl)borane with strongly coordinating anions such as CN- and [M(CN)4]2- (M = Ni, Pd) is a synthetically facile route to the bulky, very weakly [CN{B(C6F5)3}2]- [M{CNB(C6F5)3}4]2- which are isolated stable NHMe2Ph+ CPh3+ salts. crystal structures [CPh3][CN{B(C6F5)3}2] (1), [CPh3][ClB(C6F5)3] (2), [NHMe2Ph]2[Ni{CNB(C6F5)3}4]·2Me2CO (4b·2Me2CO), [CPh3]2[Ni{CNB(C6F5)3}4]·2CH2Cl2 (4c·2CH2Cl2), [CPh3]2[Pd{CNB(C6F5)3}4]·2CH2Cl2 (5c·2CH2Cl2) reported. CN stretching frequencies in 4 5 shifted by ∼110 cm-1 higher wavenumbers compared parent tetracyano complexes aqueous solution, although M−C C−N distances show no significant change on B(C6F5)3 coordination. Zirconocene dimethyl L2ZrMe2 [L2 Cp2, SBI rac-Me2Si(Ind)2] react 1, 4c or 5c benzene solution at 20 °C give salts binuclear methyl-bridged cations, [(L2ZrMe)2(μ-Me)][CN{B(C6F5)3}2] [(L2ZrMe)2(μ-Me)]2[M{...
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sci-hub.se 参考文章(52)
Lubin Luo, Tobin J. Marks, Ziegler–Natta catalyst activation. Thermodynamic and kinetic aspects of metallocenium ion-pair formation, dissociation, and structural reorganization Topics in Catalysis. ,vol. 7, pp. 97- 106 ,(1999) , 10.1023/A:1019155515306
A.G. Massey, A.J. Park, Perfluorophenyl derivatives of the elements : I. Tris(pentafluorophenyl)boron Journal of Organometallic Chemistry. ,vol. 2, pp. 245- 250 ,(1964) , 10.1016/S0022-328X(00)80518-5
Richard Mynott, Gerhard Fink, Wolfang Fenzl, Ethylene insertion with soluble ziegler catalysts. III: The system Cp2TiMeCl/AlMe2Cl/13C2H4 studied by 13C-NMR spectroscopy. the time-development of chain propagation and oligomer distribution Angewandte Makromolekulare Chemie. ,vol. 154, pp. 1- 21 ,(1987) , 10.1002/APMC.1987.051540101
James C. W. Chien, Baopei Xu, Olefin copolymerization and olefin/diene terpolymerization with a zirconocenium catalyst system Die Makromolekulare Chemie, Rapid Communications. ,vol. 14, pp. 109- 114 ,(1993) , 10.1002/MARC.1993.030140209
Robert C. Wade, Edward A. Sullivan, J. R. Berschied, K. F. Purcell, Synthesis of sodium cyanotrihydroborate and sodium isocyanotrihydroborate Inorganic Chemistry. ,vol. 9, pp. 2146- 2150 ,(1970) , 10.1021/IC50091A036
Stefan Beck, Armin Geyer, Hans-Herbert Brintzinger, Diffusion coefficients of zirconocene–borate ion pairs studied by pulsed field-gradient NMR—evidence for ion quadruples in benzene solutions Chemical Communications. pp. 2477- 2478 ,(1999) , 10.1039/A908203D
Matthew V. Metz, David J. Schwartz, Charlotte L. Stern, Peter N. Nickias, Tobin J. Marks, Organo-Lewis Acid Cocatalysts in Single-Site Olefin Polymerization—A Highly Acidic Perfluorodiboraanthracene Angewandte Chemie International Edition. ,vol. 39, pp. 1312- 1316 ,(2000) , 10.1002/(SICI)1521-3773(20000403)39:7<1312::AID-ANIE1312>3.0.CO;2-4
Gerhard Fink, Dieter Schnell, Elementarprozesse der Ziegler-Katalyse. III. Ermittlung der Kettenwachstumsgeschwindigkeitskonstanten aus der Molmassenverteilung Angewandte Makromolekulare Chemie. ,vol. 105, pp. 31- 38 ,(1982) , 10.1002/APMC.1982.051050104
Li Jia, Xinmin Yang, Atsushi Ishihara, Tobin J. Marks, Protected (fluoroaryl)borates as effective counteranions for cationic metallocene polymerization catalysts Organometallics. ,vol. 14, pp. 3135- 3137 ,(1995) , 10.1021/OM00007A006
You-Xian Chen, Charlotte L Stern, Tobin J Marks, None, Very large counteranion modulation of cationic metallocene polymerization activity and stereoregulation by a sterically congested (perfluoroaryl)fluoroaluminate Journal of the American Chemical Society. ,vol. 119, pp. 2582- 2583 ,(1997) , 10.1021/JA963834J