Photoexcitation of iron-allyl complexes (η5: η1-C5H4CH2CH2PPh2Fe(CO)(η1-CH2CR=CH2) (R = H, CH3) which contains a tethered phosphine ligand

Abstract Photoexcitation of the phosphino ligand chelated iron-allyl complexes ( η 5 : η ′-C 5 H 4 CH 2 CH 2 PPh 2 )Fe(CO)( η ′-CH 2 CR=CH 2 ) ( 1a : R = H; 1b : R = CH 3 ) gives a mixture of Fe−CO bond cleavaged compound ( η 5 : η 1 -C 5 H 4 CH 2 CH 2 PPh 2 )Fe( η 3 -CH 2 CRCH 2 ) ( 2 ) and Fe-allyl bond homolysis compounds [ η 4 : η 1 -(1-CH 2 CR−CH 2 )C 5 H 4 CH 2 CH 2 PPh 2 ]Fe(CO) 2 ( 3 ) and [ η 4 : η 1 -(3-CH 2 CR−CH 2 )C 5 H 4 CH 2 CH 2 PPh 2 ]Fe(CO) 2 ( 4 ) in a ratio of 20:5:1. Their structures were determined spectroscopically. No phosphine exchange products were observed when the reaction was conducted in the presence of triphenylphosphine.