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Volumn 27, Issue 15, 2008, Pages 3635-3638

Acid-promoted hydrogen migration in (2-allylphenoxo)ruthenium(II) to form an η3-allyl complex

Author keywords

[No Author keywords available]

Indexed keywords

HYDROGEN MIGRATION; RUTHENIUM;

EID: 50549097290     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om800318z     Document Type: Article
Times cited : (8)

References (45)
  • 4
    • 50549087730 scopus 로고    scopus 로고
    • Homogeneous Transition Metal Catalyzed Reactions; Moser, W. R.; Slocum, D. W., Eds.; Advances in Chemistry 230; American Chemical Society: Washington, D.C., 1992.
    • (d) Homogeneous Transition Metal Catalyzed Reactions; Moser, W. R.; Slocum, D. W., Eds.; Advances in Chemistry 230; American Chemical Society: Washington, D.C., 1992.
  • 12
    • 34250753770 scopus 로고    scopus 로고
    • and references cited therein
    • Gunnoe, T. B. Eur. J. Inorg. Chem. 2007, 1185, and references cited therein.
    • (2007) Eur. J. Inorg. Chem , pp. 1185
    • Gunnoe, T.B.1
  • 13
    • 0000461987 scopus 로고
    • Reviews of monomeric alkoxo and aryloxoruthenium complexes: a
    • Reviews of monomeric alkoxo and aryloxoruthenium complexes: (a) Bergman, R. G. Polyhedron 1995, 14, 3227.
    • (1995) Polyhedron , vol.14 , pp. 3227
    • Bergman, R.G.1
  • 14
    • 0010886102 scopus 로고
    • Abel, W, Stone, F. G. A, Wilkinson, G, Eds, Pergamon: Oxford, U.K, Chapter 8, p
    • (b) Bennett, M. A.; Khan, K.; Wenger, E. In Comprehensive Organometallic Chemistry II; Abel, W., Stone, F. G. A., Wilkinson, G., Eds.; Pergamon: Oxford, U.K., 1995; Vol. 7, Chapter 8, p 490.
    • (1995) Comprehensive Organometallic Chemistry II , vol.7 , pp. 490
    • Bennett, M.A.1    Khan, K.2    Wenger, E.3
  • 15
    • 50549102614 scopus 로고    scopus 로고
    • 2. This reaction will be reported elsewhere.
    • 2. This reaction will be reported elsewhere.
  • 16
    • 50549101768 scopus 로고    scopus 로고
    • As a typical example, the characterization of 2c is described. 2c: 1H NMR (300 MHz, C6D6, 30.0 °C) δ 3.03 (d, 3JH-H, 6.9 Hz, 2H, benzylic CH2, 4.21 (s, 5H, Cp, 5.04 (d, 3J H-H, 9.9 Hz, 1H, CH2, 5.06 (d, 3J H-H, 16.5 Hz, 1H, CH2, 6.11 (ddt, 3JH-H, 16.5, 3JH-H, 9.9, 3J H-H, 6.9 Hz, 1H, CH, 7.6 (m, 6H, PPh3, other aromatic resonances obscured by other aromatic protons in 3c and free PPh3. 31P{1H} NMR (122 MHz, C 6D6, δ 40.4 (s, Complex 2c constitutes an equilibrium mixture with the monophosphine complex 3c, having a π coordination of the alkenyl group in benzene-d6 solution (see ref 11, IR (KBr, cm-1, 3051 m
    • 2Ru: C, 72.89; H, 5.38. Found: C, 72.93; H, 5.14.
  • 18
    • 50549083645 scopus 로고    scopus 로고
    • w) = 0.0483 (0.0599) and GOF = 1.101.
    • w) = 0.0483 (0.0599) and GOF = 1.101.
  • 19
    • 50549100920 scopus 로고    scopus 로고
    • 3c: 1H NMR (300 MHz, C6D6, 18.0°C) δ 1.84 (dd, 2JH-H, 12.0, 3JH-H, 11.7 Hz, 1H, benzylic CHH, 2.78 (dd, 3JH-H, 13.8, 3JH-P, 10.8 Hz, 1H, CH2, 3.14 (br dd, 2JH-H, 12, 3JH-H, 4 Hz, 1H, benzylic CHH, 3.20 (d, 3JH-H, 7.8 Hz, 1H, CH2, 3.96 (s, 5H, Cp, 5.59 (m, 1H, CH, 6.81 (td, 3JH-H, 7.5, 4JH-H, 1.2 Hz, 1H, 4-C6H4, 6.9 (br m, 1H, C6H4, 7.0 (m, 9H, m- and p-PPh 3, 7.26 (t, 3JH-H, 8 Hz, 2H, C 6H4, 7.8 (m, 6H, o-PPh3, 31P( 1H) NMR (122 MHz, C6D6) δ 48.97 s
    • 6) δ 48.97 (s).
  • 20
    • 50549101275 scopus 로고    scopus 로고
    • 4c: 1H NMR (300 MHz, C6D6) δ 1.01 (ddd, 3JH-P, 16, 3J H-H, 10, 2JH-H, 1 Hz, 1H, anti-CHH, 1.86 (dd, 3JH-H, 10, 3J H-P, 2 Hz, 1H, CHAr, 2.97 (dd, 3JH-H, 7, 2JH-H, 2 Hz, 1H a syn-CHH, 4.12 (s, 5H, Cp, 4.62 (tdd, 3JH-H, 10, 3JH-H, 7, 3JH-P, 1 Hz, 1H, central-CH, 6.80 (td, 3JH-H, 7, 4JH-H, 1 Hz, 1H, 4-C6H4, 7.01 (m, 10H, m- and p-PPh3, 7.16 (overlapped with signal due to residual signal of deuterated benzene, C6H4, 7.40 (d, 3JH-H, 8 Hz, 1H, 6-C6H4, 7.71 t, 3JH-H, 10 Hz, 6H
    • 29OPRu: C, 68.44; H, 5.20. Found: C, 68.62; H, 5.98.
  • 21
    • 50549099546 scopus 로고    scopus 로고
    • w) = 0.0305 (0.0485) and GOF = 1.244.
    • w) = 0.0305 (0.0485) and GOF = 1.244.
  • 24
    • 50549091672 scopus 로고    scopus 로고
    • 6 at 20 °C: δ 1.98 (0.02 M of 2-allylphenol), δ 2.1 (0.04 M of 2-allylphenol), δ 2.18 (0.06 M of 2-allylphenol), δ 2.28 (0.10 M of 2-allylphenol), δ 2.43 (0.20 M of 2-allylphenol) (cf. methylene resonence in 3c: δ 1.84).
    • 6 at 20 °C: δ 1.98 (0.02 M of 2-allylphenol), δ 2.1 (0.04 M of 2-allylphenol), δ 2.18 (0.06 M of 2-allylphenol), δ 2.28 (0.10 M of 2-allylphenol), δ 2.43 (0.20 M of 2-allylphenol) (cf. methylene resonence in 3c: δ 1.84).
  • 25
    • 50549104252 scopus 로고    scopus 로고
    • 6 at 20 °C: δ 5.52 at 0.02 M, δ 5.05 at 0.10 M, δ 4.73 at 0.20 M in the presence of 2c/3c (0.02 M) (cf. free 2-allylphenol: δ 4.43).
    • 6 at 20 °C: δ 5.52 at 0.02 M, δ 5.05 at 0.10 M, δ 4.73 at 0.20 M in the presence of 2c/3c (0.02 M) (cf. free 2-allylphenol: δ 4.43).
  • 35
    • 50549087257 scopus 로고    scopus 로고
    • Although 2c · HX could not be observed, it is reasonable to propose analogous hydrogen bonding under acidic conditions to give 4c. However, we believe that this process is not a major process, because preliminary results show that treatment of the DPPE analogue of 2c, RuCp(OC6H4CH2CH=CH2)(dppe, with 2-allylphenol did not produce the corresponding η3-allyl complex at all under these conditions. Moreover, the estimated value for k P2 is almost 0 M-1 s-1 see the Supporting Information, However, since we cannot exclude the formation process via 2c · HX completely, such a possibility is also depicted in Scheme 2
    • -1 (see the Supporting Information). However, since we cannot exclude the formation process via 2c · HX completely, such a possibility is also depicted in Scheme 2.
  • 36
    • 50549095151 scopus 로고    scopus 로고
    • -1 (THF). Conditions: initial concentration of 2c/3c 0.0012 M, 2-allylphenol 250 equiv, temperature 30°C.
    • -1 (THF). Conditions: initial concentration of 2c/3c 0.0012 M, 2-allylphenol 250 equiv, temperature 30°C.
  • 44
    • 14544308809 scopus 로고    scopus 로고
    • In this reference, putative (alkoxo, and (aryloxo)ruthenium(II) complexes were reported to cause an intramolecular C-H bond cleavage reaction
    • Koike, T.; Ikariya, T. Organometallics 2005, 24, 724 In this reference, putative (alkoxo)- and (aryloxo)ruthenium(II) complexes were reported to cause an intramolecular C-H bond cleavage reaction.
    • (2005) Organometallics , vol.24 , pp. 724
    • Koike, T.1    Ikariya, T.2


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