84521-08-4

Upstream product

• 91879-24-2 C₂₁H₁₅FeO₃P^(2-) 
• 18928-34-2 ethylene 1,2-bistriflate 
• 74278-01-6 bisethylene iron tricarbonyl 
• 84520-96-7 Fe₂(CO)6(C₂H₄)2 

Relevant academic research and scientific papers

Photochemical formation of mononuclear bis- and tris(ethylene) complexes from irradiation of iron pentacarbonyl or triruthenium dodecacarbonyl: Species involved in catalytic alkene isomerization

In alkane or CF3C6F11 solutions that contain excess C2H4, near-UV irradiation of Ru(CO)4(C2H4), formed quantitatively in situ from visible light (λ > 420 nm) irradiation of Ru3(CO)12, yields Ru(CO)3(C2H4)2 at 298 K. At temperatures below 253 K further substitution can be effected photochemically to give trans-Ru(CO)2(C2H4)3. Near-UV irradiation of Ru(CO)4(C2H4) in rigid, C2H4-saturated, 3-methylpentane glasses at 90 K yields Ru(CO)3(C2H4)2, but further CO loss to give cis-Ru(CO)2(C2H4)3 is observed after only ～5% consumption of Ru(CO)4(C2H4). Isomerization of photogenerated cis-Ru(CO)2(C2H4)3 to trans-Ru-(CO)2(C2H4)3 is only observed on warming the glass above 210 K. Prolonged irradiation of photogenerated cis-Ru(CO)2(C2H4)3 at 90 K yields loss of additional CO to give a monocarbonyl complex, formulated as Ru(CO)(C2H4)4, which reacts on warming with photoreleased CO to initially regenerate cis-Ru(CO)2(C2H4)3. The photochemistry of Fe(CO)4(C2H4) is the same as that of the Ru(CO)4(C2H4) except that trans-Fe(CO)2(C2H4)3 could only be detected by IR spectroscopy at temperatures below 210 K. The new results show that species previously formulated as Fe2(CO)6(alkene)2 are in fact Fe(CO)3(alkene)2. In solution, M(CO)3(C2H4)2 (M = Fe, Ru) and Ru(CO)2(C2H4)3 are substitutionally labile and may serve as versatile reagents in preparative chemistry. Addition of deoxygenated 1-pentene to solutions of the bis- and tris(ethylene) complexes results in rapid catalytic isomerization at 293 K to a mixture of 2-pentenes, thus establishing the viability of both M(CO)3 and M(CO)2 species as repeating units in the catalytic alkene isomerization. Deactivation of M(CO)3(alkene)2 as a 1-pentene isomerization catalyst, in the absence of excess CO, proceeds, at least in part, by dehydrogenation of 1-pentene to form the stable, catalytically inactive (at 298 K) M(CO)3(η4-1,3-pentadiene) complexes.

Preparation and Properties of, and Reactions with, Metal-Containing Heterocycles, XLV. Directed Preparation of Ferracyclopropanes and -pentanes as Reactive Intermediates in the Organic Synthesis

The complexes (OC)3LFe(η2-C2H4) (5a-c) and ferracyclopentanes (6ax-cx, 6ay, by, 6az) and ferrahydrindanes (7a,b), respectively, are obtained by nucleophilic elimination-cycloaddition on the bis(triflates) Y-2-Y (2), 2 (3x-z) and cyclo-C6H10(CH2-Y)2 (4) with the bifunctional anions 2- (1a-c) a), PPh3 (b), P(OMe)3 (c)> in dimethylether and ether, respectively. 5a and 6ax are reactive intermediates in the Fe(CO)5-catalysed olefin carbonylation. 6bx and 5b crystallize from n-butane and n-pentane in the triclinic and monoclinic space group P1/ and C2/c with Z = 2 and 8, respectively.In 5b ethene is located equatorially, 6bx has twist conformation.The thermal decomposition of 6ax and 7a is investigated in the presence and absence of CO.While 6ax behaves indifferent towards liquid SO2, into the Fe-C ? bond, which is in trans-position to the PPh3 ligand, SO2 can be inserted under formation of the cyclic sulfinato-S complex 9.