메뉴 건너뛰기




Volumn 13, Issue 7, 2007, Pages 2002-2011

Rate and mechanism of the reaction of alkenes with aryl palladium complexes ligated by a bidentate P,P ligand in heck reactions

Author keywords

Heck reaction; Kinetics; P ligands; Palladium; Regioselectivity

Indexed keywords

COMPLEXATION; LIGANDS; OXIDATION; PALLADIUM COMPOUNDS; REACTION KINETICS; REGIOSELECTIVITY;

EID: 34047255523     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200600153     Document Type: Article
Times cited : (69)

References (48)
  • 1
    • 0000279636 scopus 로고
    • For reviews on Heck reactions see: a
    • For reviews on Heck reactions see: a) A. de Mejeire, F. E. Meyer. Angew. Chem. 1994, 106, 2473-2506;
    • (1994) Angew. Chem , vol.106 , pp. 2473-2506
    • de Mejeire, A.1    Meyer, F.E.2
  • 7
    • 0025999148 scopus 로고    scopus 로고
    • 2 and dppp see: a) W. Cabri, I. Candiani, S. DeBernardinis, F. Francalanci, S. Penco, R. Santi, J. Org. Chem. 1991, 56, 5796-5800:
    • 2 and dppp see: a) W. Cabri, I. Candiani, S. DeBernardinis, F. Francalanci, S. Penco, R. Santi, J. Org. Chem. 1991, 56, 5796-5800:
  • 26
    • 0000051004 scopus 로고    scopus 로고
    • Milstein et al. have established that the cationic complex was the reactive species generated from a neutral [Pd(dippp)ClPh] complex (dippp=1,3-bis(diisopropylphosphino)propane). M. Portnoy. Y. Ben-David, I. Rousso, D. Milstein. Organometallics 1994, 13, 3465-3479.
    • Milstein et al. have established that the cationic complex was the reactive species generated from a neutral [Pd(dippp)ClPh] complex (dippp=1,3-bis(diisopropylphosphino)propane). M. Portnoy. Y. Ben-David, I. Rousso, D. Milstein. Organometallics 1994, 13, 3465-3479.
  • 34
    • 3042774223 scopus 로고    scopus 로고
    • For a theoretical approach to the regiochemistry of palladium-phosphine- catalyzed Heck reactions see: R. J. Deeth, A. Smith, J. M. Brown, J. Am. Chem. Soc. 2004, 126, 7144-7151
    • For a theoretical approach to the regiochemistry of palladium-phosphine- catalyzed Heck reactions see: R. J. Deeth, A. Smith, J. M. Brown, J. Am. Chem. Soc. 2004, 126, 7144-7151.
  • 35
    • 0035939692 scopus 로고    scopus 로고
    • For similar reactions involving the binap ligand see
    • a) C. Amatore, A. Jutand, A. Thuilliez, Organometallics 2001, 20, 3241-3249; For similar reactions involving the binap ligand see:
    • (2001) Organometallics , vol.20 , pp. 3241-3249
    • Amatore, C.1    Jutand, A.2    Thuilliez, A.3
  • 38
    • 34250629320 scopus 로고    scopus 로고
    • 2IPh];
    • 2IPh];
  • 42
    • 0030743672 scopus 로고    scopus 로고
    • 2IPh] complexes, which are not electrochemically oxidized, the complexes [Pd(P,P)IPh] (P.P = bidentate bisphosphine ligand) are indeed oxidized. See: C. Amatore, G. Broeker, A. Jutand, F. Khalil, J. Am. Chem. Soc. 1997, 119, 5176-5185.
    • 2IPh] complexes, which are not electrochemically oxidized, the complexes [Pd(P,P)IPh] (P.P = bidentate bisphosphine ligand) are indeed oxidized. See: C. Amatore, G. Broeker, A. Jutand, F. Khalil, J. Am. Chem. Soc. 1997, 119, 5176-5185.
  • 43
    • 34250675337 scopus 로고    scopus 로고
    • A direct reciprocal dependence on the acetate ion concentration could not be established due to the compensating effect of ionic strength. At identical ionic strength, the decelerating effect of acetate ions is higher than the accelerating effect induced by the ionic strength. However, the reaction performed in the presence of 20 equivalents of nBu4NOAc (Figure 3c″) was faster than that performed in the presence of 10 equivalents of nBu4NOAc Figure 3b″, This finding shows that the antagonistic effect between the acceleration due to the ionic strength and the specific deceleration due to the acetate ions is in this case in favor of the ionic strength. The saturating effect was not observed at high AcO, concentrations because the condition k1 k2 [AcO-]k2k 3[CH2-CHCO2Me] was not fulfilled over the range of available methyl a
    • 2Me] was not fulfilled over the range of available methyl acrylate concentrations.
  • 44
    • 34250668445 scopus 로고    scopus 로고
    • The minimum concentration of styrene beyond which the reaction would be limited by the dissociation of [Pd(dppp)(OAc)Ph] can be estimated from the transition between the limits in Equations (4) and (6, styrene, AcO, k1/K1K 2k3. From the values of k1, Table 1) and K1K2k3 (see below, and the fact that [AcO, cannot exceed C0. this equality imposes the condition that at least 2500 equivalents of styrene (≈s30M) would he required to observe the saturation effect
    • 0. this equality imposes the condition that at least 2500 equivalents of styrene (≈s30M) would he required to observe the saturation effect.
  • 45
    • 34250651730 scopus 로고    scopus 로고
    • 4 (0.26M).
    • 4 (0.26M).
  • 46
    • 34250637977 scopus 로고    scopus 로고
    • Conversely, when the methyl acrylate concentration is lower under the conditions of Figure 4a (line A, the rate law is given by Equation (9, It predicts a nonlinear dependence of kobs versus [CH 2= CHR, because the term [X] varies. However, this term is of the order of C0=12.2mM in the experimental conditions of Figure 4a. Thus, by using the values of k4k 5(k 4+k5, and K 1K2k3 determined above, it follows that the mean value of kobs at low methyl acrylate concentrations is kobsmin 1, 5×10 3 × [CH2=CHRl, namely, exactly in the range observed for line A in Figure 4a
    • 2=CHRl, namely, exactly in the range observed for line A in Figure 4a.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.