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Won YS. Computational study on the decomposition of tetraneopentyl zirconium for the chemical vapor deposition of zirconium carbide. KOREAN J CHEM ENG 2012. [DOI: 10.1007/s11814-012-0050-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Xue ZL, Morton LA. Transition metal alkylidene complexes. Pathways in their formation and tautomerization between bis-alkylidenes and alkyl alkylidynes. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.06.048] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Yahia A, Castro L, Maron L. A theoretical study of uranium(IV) bis-methyl complexes: towards the predictive formation of a transient uranium(IV) carbene complex. Chemistry 2010; 16:5564-7. [PMID: 20397249 DOI: 10.1002/chem.201000022] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ahmed Yahia
- Laboratoire de Physique et Chimie des Nano-objets, INSA, Université Paul Sabatier, 135 avenue de Rangueil, 31077 Toulouse Cedex, France
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Chen SJ, Zhang XH, Yu X, Qiu H, Yap GPA, Guzei IA, Lin Z, Wu YD, Xue ZL. Reaction of Ta(NMe2)5 with O2: Formation of Aminoxy and Unusual (Aminomethyl)amide Oxo Complexes and Theoretical Studies of the Mechanistic Pathways. J Am Chem Soc 2007; 129:14408-21. [DOI: 10.1021/ja075076a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shu-Jian Chen
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Xin-Hao Zhang
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Xianghua Yu
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - He Qiu
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Glenn P. A. Yap
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Ilia A. Guzei
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Zhenyang Lin
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Yun-Dong Wu
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Zi-Ling Xue
- Contribution from the Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, China, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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Gueta-Neyroud T, Tumanskii B, Kapon M, Eisen MS. Synthesis and Characterization of Dichlorotitanium Alkoxide Complex and Its Activity in the Polymerization of α-Olefins. Macromolecules 2007. [DOI: 10.1021/ma070771o] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tal Gueta-Neyroud
- Schulich Faculty of Chemistry and Institute of Catalysis Science and Technology, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Boris Tumanskii
- Schulich Faculty of Chemistry and Institute of Catalysis Science and Technology, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Moshe Kapon
- Schulich Faculty of Chemistry and Institute of Catalysis Science and Technology, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Moris S. Eisen
- Schulich Faculty of Chemistry and Institute of Catalysis Science and Technology, Technion−Israel Institute of Technology, Haifa 32000, Israel
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Qiu H, Cai H, Woods JB, Wu Z, Chen T, Yu X, Xue ZL. Disilyl Complexes of Zirconium, Hafnium, and Tantalum. Their Synthesis, Characterization, and Exchanges with Silyl Anions. Organometallics 2005. [DOI: 10.1021/om050302f] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- He Qiu
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Hu Cai
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Jaime B. Woods
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Zhongzhi Wu
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Tianniu Chen
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Xianghua Yu
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Zi-Ling Xue
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
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Yu X, Bi S, Guzei IA, Lin Z, Xue ZL. Zirconium, Hafnium, and Tantalum Amide Silyl Complexes: Their Preparation and Conversion to Metallaheterocyclic Complexes via γ-Hydrogen Abstraction by Silyl Ligands. Inorg Chem 2004; 43:7111-9. [PMID: 15500349 DOI: 10.1021/ic049023v] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New transition metal silyl amide complexes (Me(2)N)(3)Ta[N(SiMe(3))(2)](SiPh(2)Bu(t)) (1) and (Me(2)N)M[N(SiMe(3))(2)](2)(SiPh(2)Bu(t)) (M = Zr, 2a, and Hf, 2b) were found to undergo gamma-H abstraction by the silyl ligands to give metallaheterocyclic complexes (3) and (M = Zr, 4a, and Hf, 4b), respectively. The conversion of 1 to 3 follows first-order kinetics with DeltaH() = 23.6(1.6) kcal/mol and DeltaS() = 3(5) eu between 288 and 313 K. The formation of 4a from (Me(2)N)Zr[N(SiMe(3))(2)](2)Cl (5a) and Li(THF)(2)SiPh(2)Bu(t) (6) involves the formation of the intermediate 2a, followed by gamma-H abstraction. Kinetic studies of these consecutive reactions, a second-order reaction to give 2a and then a first-order gamma-H abstraction to give 4a, were conducted by an analytical method and a numerical method. At 278 K, the rate constants k(1) and k(2) for the two consecutive reactions are 2.17(0.03) x 10(-)(3) M(-)(1) s(-)(1) and 5.80(0.15) x 10(-)(5) s(-)(1) by the analytical method. The current work is a rare kinetic study of the A + B --> C --> D (+ E) consecutive reactions. Kinetic studies of the formation of a metallaheterocyclic moiety have, to our knowledge, not been reported. In addition, gamma-H abstraction by a silyl ligand to give such a metallaheterocyclic moiety is new. Theoretical investigations of the gamma-H abstraction by silyl ligands have been conducted by density functional theory calculations at the Becke3LYP (B3LYP) level, and they revealed that the formation of the metallacyclic complexes through gamma-H abstraction is entropically driven. X-ray crystal structures of (Me(2)N)(3)Ta[N(SiMe(3))(2)](SiPh(2)Bu(t)) (1), (Me(2)N)Zr[N(SiMe(3))(2)](2)Cl (5a), and (M = Zr, 4a, and Hf, 4b) are also reported.
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Affiliation(s)
- Xianghua Yu
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996-1600, USA
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Yu X, Morton LA, Xue ZL. Transition-Metal Silyl Complexes and Chemistry in the Reactions of Silanes with Transition-Metal Complexes. Organometallics 2004. [DOI: 10.1021/om049862p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xianghua Yu
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Laurel A. Morton
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
| | - Zi-Ling Xue
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996
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Alladin T, Beaudoin MC, Scott SL. Thermolysis of silica-supported bis(neopentyl) complexes of titanium and zirconium. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(02)01272-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Beaudoin MC, Womiloju O, Fu A, Ajjou JAN, Rice GL, Scott SL. Silica-supported alkylidene complexes: their preparation, characterization and reactivity, especially towards olefins. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(02)00248-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Silyl-substituted alkylidenes: preparation of the novel complexes and mechanistic studies of their formation from reactions of alkylidenes with silanes and silyl-to-alkylidyne migration. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(02)00221-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Affiliation(s)
- Richard R Schrock
- Department of Chemistry 6-331, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
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Liu X, Wu Z, Cai H, Yang Y, Chen T, Vallet CE, Zuhr RA, Beach DB, Peng ZH, Wu YD, Concolino TE, Rheingold AL, Xue Z. Reactions of tetrakis(dimethylamide)-titanium, -zirconium and -hafnium with silanes: synthesis of unusual amide hydride complexes and mechanistic studies of titanium-silicon-nitride (Ti-Si-N) formation. J Am Chem Soc 2001; 123:8011-21. [PMID: 11506557 DOI: 10.1021/ja010744s] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
M(NMe(2))(4) (M = Ti, Zr, Hf) were found to react with H(2)SiR'Ph (R' = H, Me, Ph) to yield H(2), aminosilanes, and black solids. Unusual amide hydride complexes [(Me(2)N)(3)M(mu-H)(mu-NMe(2))(2)](2)M (M = Zr, 1; Hf, 2) were observed to be intermediates and characterized by single-crystal X-ray diffraction. [(Me(2)N)(3)M(mu-D)(mu-NMe(2))(2)](2)M (1-d(2), 2-d(2)) were prepared through reactions of M(NMe(2))(4) with D(2)SiPh(2). Reactions of (Me(2)N)(3)ZrSi(SiMe(3))(3) (5) with H(2)SiR'Ph were found to give aminosilanes and (Me(2)N)(2)Zr(H)Si(SiMe(3))(3) (6). These reactions are reversible through unusual equilibria such as (Me(2)N)(3)ZrSi(SiMe(3))(3) (5) + H(2)SiPh(2) right arrow over left arrow (Me(2)N)(2)Zr(H)Si(SiMe(3))(3) (6) + HSi(NMe(2))Ph(2). The deuteride ligand in (Me(2)N)(2)Zr(D)Si(SiMe(3))(3) (6-d(1)) undergoes H-D exchange with H(2)SiR'Ph (R' = Me, H) to give 6 and HDSiR'Ph. The reaction of Ti(NMe(2))(4) with SiH(4) in chemical vapor deposition at 450 degrees C yielded thin Ti-Si-N ternary films containing TiN and Si(3)N(4). Ti(NMe(2))(4) reacts with SiH(4) at 23 degrees C to give H(2), HSi(NMe(2))(3), and a black solid. HNMe(2) was not detected in this reaction. The reaction mixture, upon heating, gave TiN and Si(3)N(4) powders. Analyses and reactivities of the black solid revealed that it contained -H and unreacted -NMe(2) ligands but no silicon-containing ligand. Ab initio quantum chemical calculations of the reactions of Ti(NR(2))(4) (R = Me, H) with SiH(4) indicated that the formation of aminosilanes and HTi(NR(2))(3) was favored. These calculations also showed that HTi(NH(2))(3) (3b) reacted with SiH(4) or H(3)Si-NH(2) in the following step to give H(2)Ti(NH(2))(2) (4b) and aminosilanes. The results in the current studies indicated that the role of SiH(4) in its reaction with Ti(NMe(2))(4) was mainly to remove amide ligands as HSi(NMe(2))(3). The removal of amide ligands is incomplete, and the reaction thus yielded "=Ti(H)(NMe(2))" as the black solid. Subsequent heating of the black solid and HSi(NMe(2))(3) may then yield TiN and Si(3)N(4), respectively, as the Ti-Si-N materials.
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Affiliation(s)
- X Liu
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
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Schmid R, Ziegler T. Ethylene-polymerization by surface supported Cr(IV) species: possible reaction mechanisms revisited by theoretical calculations. CAN J CHEM 2000. [DOI: 10.1139/v99-242] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Possible reaction mechanisms of olefin polymerization catalyzed by surface supported Cr(IV) species have been investigated by first principles density functional theory (DFT). Pathways starting from neutral alkylidene or bisalkyl complexes were found to suffer from high ethylene insertion barriers, whereas a cationic system formed by protonation of the alkylidene show a low barrier for chain propagation.Key words: density functional theory, alkylidene, olefin polymerization, Cr(IV) species.
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Wu YD, Peng ZH, Chan KWK, Liu X, Tuinman AA, Xue Z. Computational and Experimental Studies on the Thermolysis Mechanism of Zirconium and Hafnium Tetraalkyl Complexes. Difference between Titanium and Zirconium Complexes. Organometallics 1999. [DOI: 10.1021/om980595v] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Yun-Dong Wu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Zhi-Hui Peng
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Kyle W. K. Chan
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Xiaozhan Liu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Albert A. Tuinman
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
| | - Ziling Xue
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600
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Wu Z, Diminnie JB, Xue Z. d0 Bis(silyl) Complexes Free of Anionic π-Ligands: Syntheses, Structures, and a Novel Exchange between Silyl Ligands and Silyl Anions. J Am Chem Soc 1999. [DOI: 10.1021/ja984424t] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhongzhi Wu
- Department of Chemistry, The University of Tennessee Knoxville, Tennessee 37996-1600
| | - Jonathan B. Diminnie
- Department of Chemistry, The University of Tennessee Knoxville, Tennessee 37996-1600
| | - Ziling Xue
- Department of Chemistry, The University of Tennessee Knoxville, Tennessee 37996-1600
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Berrigan RA, Metson JB, Russell DK. Radical and Molecular Processes in the Thermal Decomposition of Trimethyl and Triethyl Stibines. ACTA ACUST UNITED AC 1998. [DOI: 10.1002/(sici)1521-3862(199801)04:01<23::aid-cvde23>3.0.co;2-q] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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McAlexander LH, Li L, Yang Y, Pollitte JL, Xue Z. Syntheses of Titanium and Zirconium Chlorotrialkyl Complexes and Crystal Structure of Chlorotrineopentylzirconium Containing Unusual Linear Symmetric Metal-Chloride Polymeric Chains. Inorg Chem 1998; 37:1423-1426. [PMID: 11670357 DOI: 10.1021/ic971407g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lenore H. McAlexander
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996-1600
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Affiliation(s)
- Yun-Dong Wu
- Contribution from the Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Zhi-Hui Peng
- Contribution from the Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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McAlexander LH, Hung M, Li L, Diminnie JB, Xue Z, Yap GPA, Rheingold AL. Alkyl−Silyl Complexes Free of Anionic π Ligands. Synthesis and Characterization of (Me3ECH2)3MSi(SiMe3)3. Organometallics 1996. [DOI: 10.1021/om960813p] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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