9 research outputs found
Triple-Decker Pentalene Complex of Iron and Cobalt
In [1(1,2,3,3a,6a-ƞ)-1,4-dihydropentalenyl][µ-1](1,2,3,3a,-6a-ƞ):2(3a,4,5,6,6a-ƞ)-pentalene][2(ƞ5)-pentamethylcyclopentadienyl]cobaltiron, [CoFe(C8H7)Cp*(C8H6)] (Cp*=C10H15), the Cp*-Co and (C8H7)-Fe moieties reside on opposite sides of the fused bridging pentalene ring system
Triple-Decker [Cp*Fe(C8H6)Fe(C8H7)]
The title compound [2(1,2,3,3a,6a-Ćž)pentalene]-[l(Ćž5)-pentamethylcyclopentadienyl]diiron, [Fe2(C8H7)-(C10H15)(C8H6)], has a metallocenic structure with the two pentalene ligands adopting an eclipsed conformation. In the central pentalene ligand, all the peripheral bonds are of similar length whereas the bridge bond is longer; there are two significantly different Fe-C distances, i.e. a mean value of 2.121(3)A for the Fe-Cbridge distances and a mean value of 2.028(3)A for the distances from the Fe atoms to all other Catoms. In the terminal pentalene ligand, the C-C and C-Fe distances in the ring bonded to the Fe atom are all similar
Reaction of Tetramenthylfulvene rhenium complexes (η6-C5Me4CH 2)Re(CO)2R (R = I, C6F5) with alkyl phosphines and trimethylphosphosphite. X-Ray Structure of [(η5-C5Me4CH 2-(PMe3))Re(CO)2(PMe3)]+ I-
The fulvene complex (η6-C5Me4CH2 )Re(CO)2(C6F5) 1a reacts with alkyl phosphines to yield the zwitterionic species (η5-C5Me4CH2 PR3)Re(CO)2(C6F 5) 2 (R = Me, Et, iPr). Reaction of the analogous iodo complex (η6-C5Me4CH2 )Re(CO)2I, 1b, with PMe3 and PEt3 affords the cationic species [(η5-C5Me4CH2 (PR3))Re(CO)2(PR3)] + I- 3 (R = Me, Et). However, reaction of 1b with Pi Pr3 yields the zwitterion (η5-C5Me4CH2 PiPr3)Re(CO)2 (I) 4. Trimethyl phosphite reacts with both 1a and 1b to afford the phosphonate complexes (η5-C5Me4CH2 P(O)(OMe)2)Re(CO)2(P(OMe) 3) 5a and trans-(η5C5Me4 CH2P(O)(OMe)2)Re(CO)2 (C6F5)(Me) 5b respectively. The complex [(η5-C5Me4CH2 (PMe3))Re(CO)2(PMe3 )]+ I- 3a has been characterized by X-ray structural analysis.fulvene complexes, functionalized cyclopentadienyl complexes.Peer reviewe
Synthesis and reactions of the rhenium fulvene complexes [Re(η6-C5Me4CH2)(CO) 2(C6F4R)] (R = F or CF3): Products derived from initial C-F activation
The UV irradiation of [Re(η5-C5Me5)(CO)3] in the presence of C6F6 effected intermolecular C-F and intramolecular C-H activation generating [Re(η6-C5Me4CH2)(CO) 2(C6F5)] 1a in two isomeric forms. In the major isomer the CH2 group lies trans to the C6F5 group both in solution and in the crystal. In the minor isomer the CH2 lies cis to the C6F5 group. A similar reaction with C6F5CF3 generates [Re(η6-C5Me4CH2)(CO) 2(C6F4CF3)] 1b in four isomeric forms. In the major form the CF3 group is in the 4 position and the CH2 group lies trans to the C6F4CF3 group. The other three isomers are formed by rotation of the η6-C5Me4CH2 ligand as above, by placing the CF3 at the 3 position, and by a combination of the two. Complex 1a reacted with PMe3 to form the zwitterionic complex [Re(η5-C5Me4CH2PMe 3)(CO)2(C6F5)] and with MeO- to form the anion [Re(η5-C5Me4CH2OMe)(CO) 2(C6F5)]-, isolable as the NEt4+ salt. The reaction of 1a with HX (X = Cl or Br) generated cis-[Re(η5-C5Me5)(CO)2(C 6F5)X] initially. Mo
Photochemical C-Cl bond activation of trichloroarenes by the rhenium complex (eta(5)-C5Me5)Re(CO)(3). X-ray structure of trans-(eta(5)-C5Me5)Re(CO)(2)(2-methoxy-4,5-dichlorophenyl)chloride
Photochemical reaction of (eta(5)-C5Me5)Re(CO)(3), with 2,4,5-trichloroanisole and 3,4,5-trichlorotrifluoromethylbenzene yields (eta(5)- C5Me5)Re(CO)(2)(C6H2Cl2(MeO))Cl (1) and (eta(5)-C5Me5)Re(CO)(2)(C6H2Cl2(CF3))Cl, (2) formed by insertion of the fragment (eta(5)- C5Me5)Re(CO)(2) into the C-Cl bond of the chloroarenes. The C-Cl bond activation of trichloroanisole occurs at the chlorine ortho respect to the methoxy group as revealed by the X-ray structure of 1. In the case of the reaction with C6H2Cl3(CF3), H-1-NMR spectroscopy indicates that only the C-Cl bond meta respect to CF3 group is cleaved. Complex 1 was isolated as the trans isomer while 2 was obtained as an isomeric mixture (trans-2 and cis-2). The stereochemistry of these complexes has been assigned by IR and C-13-NMR spectroscopies and supported by X-ray crystallography for 1
Triple-Decker Pentalene Complex of Iron and Cobalt
In [1(1,2,3,3a,6a-ƞ)-1,4-dihydropentalenyl][µ-1](1,2,3,3a,-6a-ƞ):2(3a,4,5,6,6a-ƞ)-pentalene][2(ƞ5)-pentamethylcyclopentadienyl]cobaltiron, [CoFe(C8H7)Cp*(C8H6)] (Cp*=C10H15), the Cp*-Co and (C8H7)-Fe moieties reside on opposite sides of the fused bridging pentalene ring system
Triple-Decker [Cp*Fe(C8H6)Fe(C8H7)]
The title compound [2(1,2,3,3a,6a-Ćž)pentalene]-[l(Ćž5)-pentamethylcyclopentadienyl]diiron, [Fe2(C8H7)-(C10H15)(C8H6)], has a metallocenic structure with the two pentalene ligands adopting an eclipsed conformation. In the central pentalene ligand, all the peripheral bonds are of similar length whereas the bridge bond is longer; there are two significantly different Fe-C distances, i.e. a mean value of 2.121(3)A for the Fe-Cbridge distances and a mean value of 2.028(3)A for the distances from the Fe atoms to all other Catoms. In the terminal pentalene ligand, the C-C and C-Fe distances in the ring bonded to the Fe atom are all similar