Concise route to highly reactive ruthenium metathesis catalysts containing a labile donor and an n-heterocyclic carbene (NHC) ligand

Organometallics

Volumn 22, Issue 10, 2003, Pages 1986-1988

  Conrad, J C ^a   Yap, Glenn P A ^a   Fogg, Deryn E ^a  

^a UNIVERSITY OF OTTAWA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

HETEROCYCLIC CARBENE LIGAND; LABILE DONOR; METATHESIS; PHOSPHINE; SYNTHETIC CHEMISTRY;

CATALYSIS; CATALYSTS; CHEMISTRY; MOLECULAR STRUCTURE; OLEFINS; STOICHIOMETRY; X RAY CRYSTALLOGRAPHY;

RUTHENIUM COMPOUNDS;

EID: 0038600733     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om0302084     Document Type: Article

References (19)

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5. Precursor 1a gives access to Ru-alkylidenes containing mono-, bi-, or tridentate phosphine ligands: (a) Volland, M. A. O.; Rominger, F.; Eisentrager, F.; Hofmann, P. J. Organomet. Chem. 2002, 641, 220.
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7. 3).
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13. 3 with 3.
14. Alkyl-NHC analogues have been described: (a) Weskamp, T.; Schattenmann, W. C.; Spiegler, M.; Herrmann, W. A. Angew. Chem., Int. Ed. 1998, 37, 2490.
15. (b) Herrmann, W. A. Angew. Chem., Int. Ed. 1999, 38, 262.
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17. This implies a smaller rotational barrier for 5a vs 4a: two trans-orthogonal "banana-shaped" IMes ligands are presumably permitted greater motion than an IMes ligand trans to the 3-D bulk of a phosphine ligand.
18. 2. A molecule of toluene solvent was located disordered at a 2-fold axis. All hydrogen atoms were treated as idealized contributions. All scattering factors are contained in the SHELXTL 6.12 program library (G. M. Sheldrick, Bruker AXS, Madison, WI, 2001). Crystallographic data (excluding structure factors) have been deposited with the Cambridge Crystallographic Data Centre as CCDC publication #203512. These data can be obtained free of charge on a application to the CCDC at 12 Union Road, Cambridge CB2 1EZ, U.K.; fax (+44) 1223-336-033; email deposit@ccdc.cam.ac.uk.
19. 2 complex were also reported, though bond lengths and angles are compromised by disorder between the two NHC ligands: Trnka, T. M.; Morgan, J. P.; Sanford, M. S.; Wilhelm, T. E.; Scholl, M.; Choi, T.-L.; Ding, S.; Day, M. W.; Grubbs, R. H. J. Am. Chem. Soc. 2003, 125, 2546.