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Soc. 1990, 112, 2843.","DOI":"10.1021\/ja00163a600"},{"key":"ref14\/cit14","doi-asserted-by":"crossref","first-page":"5657","DOI":"10.1021\/ja00170a050","volume":"112","author":"Kiss G.","year":"1990","journal-title":"J. Am. Chem. Soc."},{"key":"ref15\/cit15","doi-asserted-by":"crossref","first-page":"5530","DOI":"10.1021\/ja00040a007","volume":"114","author":"Arduengo A. J.","year":"1992","journal-title":"J. Am. Chem. Soc."},{"key":"ref17\/cit17","doi-asserted-by":"crossref","first-page":"10849","DOI":"10.1021\/ja00102a086","volume":"116","author":"Atwood C. G.","year":"1994","journal-title":"J. Am. Chem. Soc."},{"key":"ref18\/cit18","first-page":"33","volume-title":"Current Methods in Inorganic Chemistry","volume":"2","author":"Bertini I.","year":"2001"},{"key":"ref19\/cit19a","doi-asserted-by":"crossref","first-page":"4230","DOI":"10.1021\/ac0000630","volume":"72","author":"Wallen S. L.","year":"2000","journal-title":"Anal. Chem."},{"key":"ref19\/cit19b","doi-asserted-by":"crossref","first-page":"249","DOI":"10.1016\/S0022-328X(02)01217-2","volume":"650","author":"Yonker C. R.","year":"2002","journal-title":"J. Organomet. Chem."},{"key":"ref20\/cit20a","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1016\/0022-328X(92)83403-5","volume":"435","author":"Hanaya M.","year":"1992","journal-title":"J. Organomet. Chem."},{"key":"ref20\/cit20b","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1021\/om00105a015","volume":"8","author":"Hanaya M.","year":"1989","journal-title":"Organometallics"},{"key":"ref21\/cit21","doi-asserted-by":"crossref","first-page":"877","DOI":"10.1021\/cr940053x","volume":"96","author":"Connelly N. G.","year":"1996","journal-title":"Chem. Rev."},{"key":"ref23\/cit23a","unstructured":"aThe use of MeCN solvent for reductions using KC8may seem unusual (THF is more commonly used), but it has precedent (ref23b). However, it is known that MeCN can be deprotonated by KC8(ref23c), and we do not know whether the reduction of the radical occurs directly by KC8or by the cyanomethyl anion."},{"key":"ref23\/cit23b","doi-asserted-by":"crossref","first-page":"11914","DOI":"10.1021\/ic200857x","volume":"50","author":"Mock M. T.","year":"2011","journal-title":"Inorg. Chem."},{"key":"ref23\/cit23c","doi-asserted-by":"crossref","first-page":"653","DOI":"10.1016\/S0040-4039(01)92718-2","volume":"18","author":"Savoia D.","year":"1977","journal-title":"Tetrahedron Lett."},{"key":"ref24\/cit24","doi-asserted-by":"crossref","first-page":"1019","DOI":"10.1021\/jo048252w","volume":"70","author":"Kaljurand I.","year":"2005","journal-title":"J. Org. Chem."},{"key":"ref25\/cit25","doi-asserted-by":"crossref","first-page":"5005","DOI":"10.1021\/ja00950a006","volume":"87","author":"Coetzee J. F.","year":"1965","journal-title":"J. Am. Chem. 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Soc."},{"key":"ref37\/cit37a","doi-asserted-by":"crossref","first-page":"1313","DOI":"10.1515\/znb-1983-1101","volume":"38","author":"Ackermann K.","year":"1983","journal-title":"Z. Naturforsch. B"},{"key":"ref37\/cit37b","doi-asserted-by":"crossref","first-page":"P42","DOI":"10.1016\/S0022-328X(00)88691-X","volume":"12","author":"\u00d6fele K.","year":"1968","journal-title":"J. Organomet. Chem."},{"key":"ref37\/cit37c","doi-asserted-by":"crossref","first-page":"5865","DOI":"10.1021\/ja011761k","volume":"124","author":"Tafipolsky M.","year":"2002","journal-title":"J. Am. Chem. Soc."},{"key":"ref38\/cit38a","doi-asserted-by":"crossref","first-page":"749","DOI":"10.1021\/ja00810a019","volume":"96","author":"Adams R. D.","year":"1974","journal-title":"J. Am. Chem. Soc."},{"key":"ref38\/cit38b","doi-asserted-by":"crossref","first-page":"643","DOI":"10.1021\/ja00210a079","volume":"110","author":"McLain S. J.","year":"1988","journal-title":"J. Am. Chem. Soc."},{"key":"ref39\/cit39a","unstructured":"aA CSD search (version 5.33, August 2012) for 5-membered NHC complexes of chromium gave 37 hits."},{"key":"ref39\/cit39b","unstructured":"bCr\u2013C(carbene)bond lengths in other Cr-IMe complexes: Cr(CO)4(IMe)2, 2.131(3) \u00c5 (ref37a.); [Cr(CO)4(IMe)2]+\u2022[PF6]\u2212, 2.113(4) and 2.119(4) \u00c5 (ref37a.); Cr(CO)5(IMe), 2.138(2) and 2.145(2) \u00c5 (two independent molecules, ref37c.)."},{"key":"ref39\/cit39c","doi-asserted-by":"crossref","first-page":"704","DOI":"10.1002\/chem.200390079","volume":"9","author":"Hahn F. E.","year":"2003","journal-title":"Chem.\u2014Eur. J."},{"key":"ref40\/cit40","doi-asserted-by":"crossref","first-page":"4791","DOI":"10.1021\/om960374u","volume":"15","author":"Hammack D. J.","year":"1996","journal-title":"Organometallics"},{"key":"ref41\/cit41","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/0010-8545(94)80069-3","volume":"135","author":"Rieger P. 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B"},{"key":"ref47\/cit47a","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1002\/9780470166345.ch5","volume":"33","author":"Darensbourg M. Y.","year":"1985","journal-title":"Prog. Inorg. Chem."},{"key":"ref47\/cit47b","doi-asserted-by":"crossref","first-page":"1521","DOI":"10.1021\/ja00370a012","volume":"104","author":"Darensbourg M. Y.","year":"1982","journal-title":"J. Am. Chem. Soc."},{"key":"ref48\/cit48","doi-asserted-by":"crossref","first-page":"2257","DOI":"10.1021\/ja00269a022","volume":"108","author":"Moore E. J.","year":"1986","journal-title":"J. Am. Chem. Soc."},{"key":"ref49\/cit49","doi-asserted-by":"crossref","first-page":"7493","DOI":"10.1021\/ja00020a007","volume":"113","author":"Parker V. D.","year":"1991","journal-title":"J. Am. Chem. Soc."},{"key":"ref50\/cit50","doi-asserted-by":"crossref","first-page":"5851","DOI":"10.1039\/b902612f","author":"Burchell R. P. L.","year":"2009","journal-title":"Dalton Trans."},{"key":"ref51\/cit51","doi-asserted-by":"crossref","first-page":"5077","DOI":"10.1021\/ja00065a019","volume":"115","author":"Skagestad V.","year":"1993","journal-title":"J. Am. Chem. Soc."},{"key":"ref52\/cit52a","unstructured":"aThe low stability of CpCr(CO)2(IMe)(MeCN)+and the quasi-reversibile electrochemical oxidation of CpCr(CO)2(IMe)\u2022in MeCN may be explained in the same way, as steric pressure could facilitate the (reversible) dissociation of MeCN. Even if only small equilibrium quantities of 16-electron CpCr(CO)2(IMe)+are present in MeCN solution, this would provide a pathway for decomposition and for the electrochemical reduction of CpCr(CO)2(IMe)(MeCN)+to CpCr(CO)2(IMe)\u2022by a CE mechanism. Little is known about related cations. However, the tricarbonyl CpCr(CO)3(MeCN)+has been isolated as the PF6\u2013salt (ref52b), its electrochemistry in MeCN is known (ref52c), and it has been reported to be unstable in CH2Cl2(ref52d)."},{"key":"ref52\/cit52b","doi-asserted-by":"crossref","first-page":"3143","DOI":"10.1002\/cber.19851180813","volume":"118","author":"Herberhold M.","year":"1985","journal-title":"Chem. Ber."},{"key":"ref52\/cit52c","doi-asserted-by":"crossref","first-page":"3121","DOI":"10.1021\/ic00092a018","volume":"33","author":"Tilset M.","year":"1994","journal-title":"Inorg. Chem."},{"key":"ref52\/cit52d","doi-asserted-by":"crossref","first-page":"2618","DOI":"10.1021\/ja00163a023","volume":"112","author":"Ryan O. B.","year":"1990","journal-title":"J. Am. Chem. Soc."},{"key":"ref53\/cit53","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/S0022-328X(00)92292-7","volume":"157","author":"Birdwhistell R.","year":"1978","journal-title":"J. Organomet. 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