New syndiospecific catalysts for styrene polymerization
摘要:
(Eta5-Tetramethylcyclopentadienyl)-, (eta5-tetraphenylcyclopentadienyl)-, (eta5-(diphenylphosphi-no)tetramethylcyclopentadienyl)-, and (eta5-(trimethylsilyl)tetramethylcyclopentadienyl)titanium triisopropoxide have been synthesized and characterized. Their catalytic activities for syndiospecific styrene polymerization have been compared with the reference compound (eta5-cyclopentadienyl)titanium triisopropoxide. (Eta5-Tetramethylcyclopentadienyl)titanium triisopropoxide is the best catalyst precursor, giving rise to catalysts having the highest activity to produce polystyrene with the highest syndiotactic yield and molecular weight.
Electron-deficient organouranium chemistry: synthesis and reactivity of monocyclopentadienyldiphenylphosphidouranium trisborohydrides [C5R4PPh2U(BH4)3] (R = H or CH3) and of their borane adducts
作者:D. Baudry、A. Dormond、A. Hafid、C. Raillard
DOI:10.1016/0022-328x(95)05977-w
日期:1996.4
The reactivity of the monocyclopentadienyl complex [(C5H4PPh2)U(BH4)3] and of its borane adduct [(C5H4PPh2·BH3)U(BH4)3] strongly suggest that in solutions these complexes are in equilibrium with the biscyclopentadienyls [(C5H4PPh2)2U(BH4)2] and [(C5H4PPh2·BH3)2U(BH4)2] and uranium tetraborohydride [U(BH4)4] which is the most reactive species in such systems.
单环戊二烯基络合物[(C 5 H 4 PPh 2)U(BH 4)3 ]及其硼烷加合物[(C 5 H 4 PPh 2 ·BH 3)U(BH 4)3 ]的反应性强烈表明溶液中,这些络合物与双环戊二烯基[(C 5 H 4 PPh 2)2 U(BH 4)2 ]和[(C 5 H 4 PPh 2 ·BH 3)2 U(BH )处于平衡状态。4)2 ]和铀四硼氢化物[U(BH 4)4 ]在此类系统中是反应性最高的物质。
Neutral and cationic 1,4-diphospha-2-rhoda-3-thia-[4]-ferrocenophane
作者:Roland Broussier、Myriam Laly、Patrice Perron、Bernard Gautheron、Ilya E Nifant’ev、Judith A.K Howard、Lyudmila G Kuz’mina、Philippe Kalck
DOI:10.1016/s0022-328x(99)00293-4
日期:1999.9
Fe(η5-C5Me4P(S)Ph2)(η5-C5Me4PPh2) (abbreviated P,PS}) was synthesised and used for complexation with [RhCl(CO)2]2. The neutral [4]-ferrocenophane P,PS}Rh(CO)Cl 2 and the unusual dimeric cationic species [P,PS}Rh(CO)(μ-Cl)(CO)RhP,PS}]+3 were obtained and characterized by crystal structure analysis. During investigations on the catalytic properties of 2 in carbonylation, some aspects of its behavior
Ferrocenic polyphosphines and polythioethers: synthesis, reactivity and structure
作者:Roland Broussier、Serge Ninoreille、Cyrille Bourdon、Olivier Blacque、Corinne Ninoreille、Marek M Kubicki、Bernard Gautheron
DOI:10.1016/s0022-328x(98)00551-8
日期:1998.6
The new ferrocenic polyphosphines [C5Me3-1,2-(PPh2)(2)](C5H5)Fe 2, [C5Me3-1,2-(PPh2)(2)](2),Fe 3, [C5Me3-1,2-(PPh2)(2)][C5Me4(PPh2)]Fe 4 and polythioethers [C5Me3-1,2-(SCH2CH2CH3)2](2)Fe 6 and [C5Me3-1,2-(SCH2CH2CH3)(2)](C5H5)Fe 7 have been prepared. The X-ray crystal structures of 3 and 6 have been determined. Some aspects of the reactivity of compounds 2, 3 and 4 are reported (P(III)-->P(V) transformation, chelating properties) as well as the X-ray structure of [C5Me3-1,2(PPh2)(2)W(CO)(4)](C5H5)Fe 15. (C) 1998 Elsevier Science S.A. All rights reserved.
Synthesis of bent titanocene metalloligands with the (diphenylphosphino)tetramethylcyclopentadienyl moiety. X-ray structure of [(η5-C5Me42)2TiCl2]Mo(CO)4
作者:Jan Szymoniak、Marek M. Kubicki、Jack Besançon、Claude Moïse
DOI:10.1016/s0020-1693(00)84926-9
日期:1991.2
The reactions of lithium(diphenylphosphino)tetramethylcyclopentadienide with CpTiCl3 and secondly with TiCl3 followed by CCl4 oxidation lead to the formation of two titanocene phosphines: (eta-5-C5H5)[eta-5-C5Me4P(C6H5)2]TiCl2 (2) and [eta-5-C5Me4P(C6H5)2]2TiCl2 (3), respectively. The metalloligand 3 reacts readily with Mo(CO)4cod, Mo(CO)5THF and Mo(CO)6 to give in each case [(eta-5-C5Me4PPh2)2-TiCl2]Mo(CO)4 (6) as a sole product. The structure of 6 has been determined by X-ray diffraction. Crystal data: P1 approximately, a = 11.716(1), b = 11.753(2), c = 16.110(2) angstrom, alpha = 99.06(1), beta = 92.61(1), gamma = 104.20(1)-degrees, Z = 2. The molybdenum-titanium distance of 5.194(1) angstrom rules out any metal-metal interaction. The chlorine substitution reactions by CO in 2 and 3 and by thiolate group (pH3C-C6H4-S) in 6 are reported.
Structure of 1,1'-bis(diphenylphosphinotetramethyl)ferrocene
作者:G. Trouve、R. Broussier、B. Gautheron、M. M. Kubicki
DOI:10.1107/s0108270191002767
日期:1991.9.15
[Fe(C21H22P)2], M(r) = 666.61, triclinic, P1BAR, a = 7.698 (3), b = 8.663 (2), c = 13.724 (4) angstrom, alpha = 80.25 (2), beta = 83.58 (3), gamma = 75.69 (3)-degrees, V = 871.6 angstrom 3, Z = 1, D(x) = 1.270 g cm-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 5.490 cm-1, F(000) = 352, T = 296 (1) K, R = 0.047 for 2712 reflections with I > 3.5-sigma(I). The title complex, a precursor for bi- or polymetallic compounds, bears a new bifunctional permethylated ligand which is more electron rich than the known diphenylphosphinecyclopentadienyl moiety. The geometry of the complex is affected little by the substitution of methyl groups for H atoms in the rings. The molecule is centrosymmetric with the Fe atom at the crystallographic inversion centre.