Preparation and Properties of Carbonyliron Complexes of 1-Aza-4-oxa-1,3-butadiene (α-Imino Ketone) – X-ray Crystal Structures of Fe(CO)3[MeN=C(Ph)C(Ph)=O] and Fe2(CO)4[tBuN=C(H)(Me)C(O)(O)C(Me)C(H)=NtBu]

✍ Scribed by Ron Siebenlist; Hans-Werner Frühauf; Kees Vrieze; Wilberth J. J. Smeets; Anthony L. Spek

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 473 KB
• Volume: 2000
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(200005)2000:5<907::aid-ejic907>3.0.co;2-n

✦ Synopsis

Coordination chemistry / α-Imino ketones / CO complexes / Iron complexes The reaction of Fe 2 (CO) 9 at room temperature in THF or toluene with the α-imino ketones R 1 N=C(R 2 )-C(R 3 )=O (L) (R 1 = alkyl, R 2 = H, Me, Ph, R 3 = Me, Ph) (a-k), initially results in the formation of the mononuclear chelate Fe(CO) 3 (α-imino ketone) complexes 6 which can be isolated in moderate (6h) to high (6e-g) yield. Under these reaction conditions, complexes 6 subsequently react with [Fe(CO) 4 ] fragments or dimerise, to form the dinuclear complexes Fe 2 (CO) 6 (α-imino ketone) (7a-j) or Fe 2 (CO) 4 (L-L) (8a,b,k), respectively. The complexes 8 contain two α-imino ketone ligands C-C coupled at the ketone carbon atoms. Complexes 8a,b react with CO at elevated temperatures to quantitatively yield Fe(CO) 3 (α-imino ketone) (6a,b). This reaction can be re-