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Volumn 27, Issue 15, 2008, Pages 3818-3824

Syntheses of various (arylimido)vanadium(V)-dialkyl complexes containing aryloxo and alkoxo ligands, and ring-opening metathesis polymerization using a vanadium(V)-alkylidene complex

Author keywords

[No Author keywords available]

Indexed keywords

ABS RESINS; CHEMICAL REACTIONS; CHLORINE COMPOUNDS; COMPUTER NETWORKS; MONOMERS; POLYMERS; TRANSITION METALS; VANADIUM ALLOYS;

EID: 50549095966     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om800284d     Document Type: Article
Times cited : (59)

References (65)
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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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    • 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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    • Our previous examples:(a) Yamada, J.; Nomura, K. Organometallics 2005, 24, 3621.
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    • However, the resultant polymers were mixtures of polymers prepared by olefin metathesis and coordination insertion pathways
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    • References concerning the other vanadium-aklylidenes were also cited therein
    • Yamada, J.; Fujiki, M.; Nomura, K. Organometallics 2005, 24, 2248. References concerning the other vanadium-aklylidenes were also cited therein.
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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
    • 10e were known as examples.
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    • Some of these results were presented at the XVIIth International Symposium on Olefin Metathesis (ISOMXVII), July 2007, Pasadena, CA.
    • Some of these results were presented at the XVIIth International Symposium on Olefin Metathesis (ISOMXVII), July 2007, Pasadena, CA.
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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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    • 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
    • 13)N(H)Me did not take place.
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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
    • 3 under these conditions.
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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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    • 50549091915 scopus 로고    scopus 로고
    • 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.
  • 64
    • 50549093827 scopus 로고    scopus 로고
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.