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Volumn 693, Issue 21-22, 2008, Pages 3324-3330

Transmetalation reactions. The role of the stabilizing olefin in determining the overall reaction rate

Author keywords

Kinetic study; Palladium(II) butadyenyl complexes; Stille coupling; Transmetalation reaction

Indexed keywords

CHLORINE COMPOUNDS; NANOSTRUCTURED MATERIALS; OLEFINS; PALLADIUM; PALLADIUM COMPOUNDS; REACTION RATES;

EID: 52049088486     PISSN: 0022328X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jorganchem.2008.07.028     Document Type: Article
Times cited : (12)

References (62)
  • 3
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    • Abel E.W., Stone F.G.A., and Wilkinson G. (Eds), Pergamon, Oxford, UK (Chapters 3 and 4)
    • Farina V. In: Abel E.W., Stone F.G.A., and Wilkinson G. (Eds). Comprehensive Organometallic Chemistry II vol. 12 (1995), Pergamon, Oxford, UK (Chapters 3 and 4)
    • (1995) Comprehensive Organometallic Chemistry II , vol.12
    • Farina, V.1
  • 9
  • 49
    • 52049126493 scopus 로고    scopus 로고
    • L. Canovese, G. Chessa, F. Visentin, Inorg. Synth., submitted for publication.
    • L. Canovese, G. Chessa, F. Visentin, Inorg. Synth., submitted for publication.
  • 53
    • 52049117937 scopus 로고    scopus 로고
    • note
    • 3 at 298 K. In the case of complex 1A we have also studied the reaction in the presence of but-2-ynedioic acid dimethyl ester (dma) yielding the palladacyclopentadiene derivative. The reactivity induced by dma lies between those of nq and dmfu.
  • 54
    • 52049118382 scopus 로고    scopus 로고
    • note
    • We chose fumaronitrile as the target olefin since the ensuing reactivity rates were within reasonable time intervals and because the reactions carried out in the presence of ma underwent a further slow attack of the stannane to the carbonyl groups of the coordinated maleic anhydride to give 1,8-diphenyl-oct-4-ene-1,7-diyne-3,6-dione, di(n-butyl-stannane)oxide, the free ligand MeN-SPh and palladium metal according to the reaction in the following scheme 4. It is noteworthy that the reaction between free ma and stannane carried out in the presence of complex 1A is remarkably slower than that reported above. Apparently, the side reaction noticed during the kinetic investigation is the attack of the stannane to the coordinated ma in the Pd(0) derivative.{A figure is presented}
  • 55
    • 52049119594 scopus 로고    scopus 로고
    • note
    • 1H NMR technique under our experimental conditions. We therefore took into consideration the steady state approach following the associative attack which was suggested by other authors [20].Moreover, the ring opening is somehow confirmed by the slowing down of the overall reaction rate upon addition of the free ligand MeN-SPh. Apparently, the free ligand strongly competes with the stannane and the olefin in solution owing to its capability in saturating the vacant coordination sites. Furthermore, the complete displacement of the ligand was also ruled out since in this case the ensuing kinetic law did not agree with the experimentally observed one.
  • 57
    • 52049118862 scopus 로고    scopus 로고
    • note
    • E2 open mechanism could be operative on the basis of the olefin nature which renders the palladium centre sufficiently electrophilic and of the nucleophilicity of the alkenyl stannane.
  • 59
    • 52049101433 scopus 로고    scopus 로고
    • note
    • 3 at 298 K were over in: (fn) 1A: <7 min; 1B: 60 min; 1C: 105 min; 1D: 480 min; 1E: 5 days (82%); (ma) 1A: <7 min; 1C: 10 min; 1E: <1 day.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.