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In terms of reaction kinetics there is of course one continuous process and, particularly in the middle where the \u201ctwo phases","author":"Separation"},{"key":"ja075008ob00041\/ja075008ob00041_1","unstructured":"(a) Production of Mo(CO)6from RMo(CO)3C5R5under CO pressure has been shown to yield R\u2212C(O)\u2212C5R5as described in ref 41b. The complex \u00b7Cr(CO)2(\u03b72-ketene)(C5Me5) is resistant to carbonylation. It seems possible that this is due to an unfavorable pre-equilibrium to generate \u00b7Cr(CO)3(\u03b71-ketene)(C5Me5). Once formed, this radical complex, rather than liberate ketene may form a C\u2212C bonded complex in which the (\u03b71-ketene) moiety migrates to the cyclopentadienyl ring and then adds further CO yielding ultimately Cr(CO)6and some complex organic carbonyl. The growth of a broad band near 1700 cm-1in these experiments is in keeping with that hypothesis but no attempt was made to further characterize this side product."},{"key":"ja075008ob00041\/ja075008ob00041_2","doi-asserted-by":"crossref","first-page":"1160","DOI":"10.1021\/ic00228a020","volume":"25","author":"Nolan S. P.","year":"1986","journal-title":"Inorg. Chem."},{"key":"ja075008ob00042\/ja075008ob00042_1","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/0010-8545(94)80069-3","volume":"135","author":"Rieger P. H.","year":"1994","journal-title":"Coord. Chem. Rev."},{"key":"ja075008ob00042\/ja075008ob00042_2","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1021\/om00025a023","volume":"12","author":"Hoobler R. J.","year":"1993","journal-title":"Organometallics"},{"key":"ja075008ob00042\/ja075008ob00042_3","doi-asserted-by":"crossref","first-page":"542","DOI":"10.1021\/ja00002a023","volume":"113","author":"Fortier S.","year":"1991","journal-title":"J. Am. 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Chem."},{"key":"ja075008ob00064\/ja075008ob00064_1","unstructured":"Grotjahn and co-workers (see ref 4) have shown that for coordination to the IrCl(PiPr3)2fragment Ph2CCO coordinates in an \u03b72-C,O form with \u03bdCO = 1632 cm-1, but that Ph(H)CCO coordinates in an \u03b72-C,C form with \u03bdCO = 1752 cm-1. The Cr radical complex reported here has \u03bdCO = 1672 cm-1which is somewhat closer to the C,O tautomer for Ir. However the electronic differences between the Cr and Ir complexes are large enough that no conclusion can be made at this time. Both the \u03b72-C,O form and \u03b72-C,C form have two approximately symmetry equivalent CO ligands. The ESR data showing hyperfine splitting from two equivalent13C nuclei derived from13CO cannot distinguish between the two forms. Use of13C labeled diazoalkane might be helpful in identifying possible coordination by this carbon (in the \u03b72-C,C form), but is synthetically beyond the scope of the present study."}],"container-title":["Journal of the American Chemical Society"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/ja075008o","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,10,3]],"date-time":"2021-10-03T11:45:59Z","timestamp":1633261559000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/doi\/10.1021\/ja075008o"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2007,10,26]]},"references-count":73,"journal-issue":{"issue":"46","published-print":{"date-parts":[[2007,11,1]]}},"alternative-id":["10.1021\/ja075008o"],"URL":"https:\/\/doi.org\/10.1021\/ja075008o","relation":{},"ISSN":["0002-7863","1520-5126"],"issn-type":[{"value":"0002-7863","type":"print"},{"value":"1520-5126","type":"electronic"}],"subject":[],"published":{"date-parts":[[2007,10,26]]}}}