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50549100225
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For example (general text of metal-alkyl chemistry): (a) The Organometallic Chemistry of the Transition Metals, 4th ed.; Crabtree, R. H., Ed.; John Wiley & Sons, Inc.: Hoboken, NJ, 2005; p 53.
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For example (general text of metal-alkyl chemistry): (a) The Organometallic Chemistry of the Transition Metals, 4th ed.; Crabtree, R. H., Ed.; John Wiley & Sons, Inc.: Hoboken, NJ, 2005; p 53.
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3
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Related reviews for olefin polymerization catalysts (including vanadium complexes): (a) Gambarotta, S. Coord. Chem. Rev. 2003, 237, 229.
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Related reviews for olefin polymerization catalysts (including vanadium complexes): (a) Gambarotta, S. Coord. Chem. Rev. 2003, 237, 229.
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(e) Nomura, K. In New Developments in Catalysis Research; BevyL. P., Ed.; Nova Science Publishers, Inc.: New York, 2005; p 199.
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For examples, see:(a) Buchmeiser, M. R. Chem. Rev. 2000, 100, 1565.
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(b) Schrock, R. R. In Alkene Metathesis in Organic Synthesis; FürstnerA., Ed.;Springer: Berlin, Germany, 1998; p 1.
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Pioneering examples for synthesis of block copolymers by living polymerization using vanadium catalysts:(a) Doi, Y.; Ueki, S.; Soga, K. Macromolecules 1979, 12, 814.
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Some structural characterizations, reaction chemistry of V(III),(IV) methyl complex:(a) Hessen, B.; Teuben, J. H.; Lemmen, T. H.; Huffman, J. C.; Caulton, K. G. Organometallics 1985, 4, 946.
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Some structural characterizations, reaction chemistry of V(III),(IV) methyl complex:(a) Hessen, B.; Teuben, J. H.; Lemmen, T. H.; Huffman, J. C.; Caulton, K. G. Organometallics 1985, 4, 946.
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Examples for structurally characterized V(V) alkyls:(a) de With, J.; Horton, A. D.; Orpen, A. G. Organometallics 1990, 9, 2207.
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Examples for structurally characterized V(V) alkyls:(a) de With, J.; Horton, A. D.; Orpen, A. G. Organometallics 1990, 9, 2207.
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84909652215
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Examples:(a) Preuss, F.; Ogger, L. Z. Naturforsch. 1982, 37B, 957.
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(f) Solan, G. A.; Cozzi, P. G.; Floriani, C.; Chiesi-Villa, A.; Rizzoli, C. Organometallics 1994, 13, 2572.
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22944431839
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Our previous examples:(a) Yamada, J, Nomura, K. Organometallics 2005, 24, 3621
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Our previous examples:(a) Yamada, J.; Nomura, K. Organometallics 2005, 24, 3621.
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46
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34249005854
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(b) Yamada, J.; Fujiki, M.; Nomura, K. Organometallics 2007, 26, 2579.
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0000681097
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Polymerization of 3-methylcyclobutene: Dall'Asta, G. J
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nBuLi as the catalyst, a ring-opened polymer was obtained
-
nBuLi as the catalyst, a ring-opened polymer was obtained.
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Polym. Sci., Part AI
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48
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50549091371
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Polymerization of cyclopentene:(a) Natta, G.; Dall'Asta, G.; Mazzanti, G. Angew. Chem. 1965, 76, 765.
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Polymerization of cyclopentene:(a) Natta, G.; Dall'Asta, G.; Mazzanti, G. Angew. Chem. 1965, 76, 765.
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-
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49
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0000335102
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However, the resultant polymers were mixtures of polymers prepared by olefin metathesis and coordination insertion pathways
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(b) Natta, G.; Scaglione, P. Rubber Chem. Technol. 1969, 42, 1235. However, the resultant polymers were mixtures of polymers prepared by olefin metathesis and coordination insertion pathways.
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Rubber Chem. Technol
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Natta, G.1
Scaglione, P.2
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18844462731
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References concerning the other vanadium-aklylidenes were also cited therein
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Yamada, J.; Fujiki, M.; Nomura, K. Organometallics 2005, 24, 2248. References concerning the other vanadium-aklylidenes were also cited therein.
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Organometallics
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Yamada, J.1
Fujiki, M.2
Nomura, K.3
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51
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50549085849
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In addition to V(N-2,6-iPr2C 6H3)(CH2Ph)3,9b syntheses of V(N-4-MeC6H4)(CH2SiMe3) 310b and V(NtBu)(CH2SiMe 3)310e were known as examples
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10e were known as examples.
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52
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50549095259
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Some of these results were presented at the XVIIth International Symposium on Olefin Metathesis (ISOMXVII), July 2007, Pasadena, CA.
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Some of these results were presented at the XVIIth International Symposium on Olefin Metathesis (ISOMXVII), July 2007, Pasadena, CA.
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53
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50549098357
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1H and 51V NMR spectra for monitoring the reaction mixture of 1 with 2,6-tBu2-4-MeC6H 2OH, PhN(H)Me, cyclo-C6H13)N(H)Me, and 2,6-Me2C6H3SH are shown in the Supporting Information
-
3SH are shown in the Supporting Information.
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54
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0037177023
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Nomura, K.; Sagara, A.; Imanishi, Y. Macromolecules 2002, 35, 1583.
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Macromolecules
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Nomura, K.1
Sagara, A.2
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55
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50549100455
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One speculation we may take into consideration for explaining the observed fact (especially the reaction with 2,6-tBu 2-4-MeC6H2OH) would be due to the steric bulk of both the substrate and the three CH2SiMe3 ligands for coordination of oxygen to the vanadium(V) metal center.11b This is because we proposed that the reaction of V(NAr)(Me)(N=CtBu 2)2 with phenols proceeds via pentacoordinated trigonal-bypyramidal species by coordination of phenols to the vanadium metal center.11b However, we do not have clear, appropriate experimental facts to support this speculation in this case. We do not have appropriate explanations for why the reactions with 2,6-Me2C6H 3SH, PhN(H)Me, and (cyclo-C6H13)N(H)Me did not take place
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13)N(H)Me did not take place.
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34548252401
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Nomura, K.; Atsumi, T.; Fujiki, M.; Yamada, J. J. Mol. Catal. A 2007, 275, 1.
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Nomura, K.1
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50549102569
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We previously reported that V(NAr)(CH2Ph2) 2(O-2,6-iPr2C6H3) catalyzed the ROMP of norbornene (NBE) at 25°C to afford the ring-opened polymer with high molecular weight (Mw, 4.69 × 10 6, Mw/Mn, 1.93, although the activity was low (37 turnovers after 11 h).18 The ROMP was in fact conducted under rather high concentration conditions (NBE 2.50 mmol, 0.55 mmol/mL toluene, Therefore, we assumed that the catalytically active species, vanadium(V)-alkylidene, was formed partially (but a small amount) by coordination of NBE in place of PMe3 under these conditions
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3 under these conditions.
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58
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0036441625
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Review article for synthesis of early transition metal-alkylidenes: a
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Review article for synthesis of early transition metal-alkylidenes: (a) Schrock, R. R. Chem. Rev. 2002, 102, 145.
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Schrock, R.R.1
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(c) Mindiola, D.; Bailey, B.; Basuli, F. Eur. J. Inorg. Chem. 2006, 16, 3135.
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Eur. J. Inorg. Chem
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Mindiola, D.1
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1642398765
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(a) Wang, W.; Yamada, J.; Fujiki, M.; Nomura, K. Catal. Commun. 2003, 4, 159.
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(2003)
Catal. Commun
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, pp. 159
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Wang, W.1
Yamada, J.2
Fujiki, M.3
Nomura, K.4
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63
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50549091915
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1H and 51V NMR spectra for V(CHSiMe 3)(N-2,6-Me2C6H3)(O-2,6- iPr2C6H3)(PMe3) x (3) in C6D6 at 25 and 60°C and in the presence of PMe3 (at 25°C) are shown in the Supporting Information
-
3 (at 25°C) are shown in the Supporting Information.
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-
-
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64
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50549093827
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As described in the text, we have not yet isolated analytically pure microcrystals from the reaction mixture containing 2a instead of 2b under the same conditions, but a resonance which might be ascribed to a proton (vanadium) in the alkylidene was observed in the 1H NMR (16.08 ppm, and 51V NMR, 111 and-20 ppm, spectrum in the reaction mixture (Yamada, J, unpublished results, Since PMe3 was dissociated partially in 3, synthesis of V(N-2,6-Me2C6H 3)(CH2SiMe3)2(O-2,6- tBu2-4-MeC6H2) and the thermolysis reactions in C6D6 in the presence/absence of PMe 3 (5 equiv to V) were explored as related examples. Resonances that would be ascribed to the vanadium-alkylidene were seen in both 1H and 51V NMR spectra of the reaction mixture when the reaction was conducted in the pres
-
6 are shown in the Supporting Information.
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-
-
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65
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0001559505
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Buijink, J.-K. F.; Teubin, J. H.; Kooijman, H.; Spek, A. L. Organometallics 1994, 13, 2922.
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Buijink, J.-K.F.1
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Kooijman, H.3
Spek, A.L.4
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