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6604559 
Journal Article 
C-H ACTIVATION OF OLEFINS WITH A ZEROVALENT IRON COMPLEX - ISOMERIZATION OF 4-PHENYL-1-BUTENE TO 1-PHENYL-1-BUTENE USING FE(DEPE)2N2 
Perthuisot, C; Jones, WD; , 
1994 
1 
New Journal of Chemistry
ISSN: 1144-0546
EISSN: 1369-9261 
GAUTHIER-VILLARS 
PARIS 
621-628 
WOS:A1994NR81600011 
The reactivity of Fe(depe)2N2 [depe = 1,2 bis(diethylphosphinoethane)] has been examined for its ability to activate olefinic C-H bonds. The complex loses N2 readily and reacts irreversibly with added ligands to give Fe(L)(depe)2 (L = CO, H-2, C2H4, CNR; R = 2,6-xylyl). Reaction of the complex with 2-methyl styrene under thermal conditions leads to activation of the olefinic C-H bond to form a mixture of cis and trans HFe(depe)2(CH = CHC6H4CH3). Further reaction gives eta6 coordination of the arene; no evidence for pi-complexation to the vinyl group is seen. The title complex reacts with 4-phenyl-1-butene to give an (eta6-arene)Fe(depe) complex where the arene is found to be the isomeric 1-phenyl-1-butene. The selective formation of olefin pi-complexes or C-H activated products is explained in terms of steric considerations, the mechanism of the isomerization is discussed and kinetic studies of the displacement of N2 by an incoming ligand are reported.