Generation and reactions of allylidene complexes of the (.eta.5-cyclopentadienyl)dicarbonyliron and (.eta.5-cyclopentadienyl)(trimethyl phosphite)carbonyliron

Fe(iv) alkylidenes via protonation of Fe(ii) vinyl chelates and a comparative Mössbauer spectroscopic study

“…The vinyl precursors synthesized via the C–H bond activation and insertion processes were protonated 14 – 18 to yield cationic Fe( iv ) alkylidenes, as illustrated in Scheme 4 . The tetradentate chelate complex (bdvp)Fe(PMe 3 ) 2 ( 1 -PMe 3 ) was treated with H[BAr F 4 ] 30 in THF to afford orange [(bavp)Fe(PMe 3 ) 2 ][BAr F 4 ] ( 4 -PMe 3 ) in 80% yield.…”

“…Prior to this study, [Cp*(dppe)Fe CH(Me)]PF 6 was the only non-aryl Fe( iv ) alkylidene that had undergone X-ray diffraction structural analysis, although numerous related [CpLL′Fe CHR] + complexes have been synthesized. 7 – 9 , 14 – 16 …”

“…In an effort to expand the scope of Fe( iv ) alkylidenes, and to develop new synthetic paths, Fe( ii ) vinyl chelates have been explored as potential precursors to cationic Fe( iv ) alkylidenes via protonation. 14 – 18 Entry into ferrous vinyl derivatives was implemented via precedented C–H bond activations by Karsch's cis -Me 2 Fe(PMe 3 ) 4 ( ref. 19 ) complex.…”

Fe Organoiron Compounds Part B13

“…77) has aLso been obtained in 27% yieLd by photochemicaL decarbonyLation 01 (E)-FpCOCH=CHC(CH 3 )=CH 2 in ether/benzene at -5°C [190], see aLso [198]. 77) has aLso been obtained in 27% yieLd by photochemicaL decarbonyLation 01 (E)-FpCOCH=CHC(CH 3 )=CH 2 in ether/benzene at -5°C [190], see aLso [198].…”

“…(E, E)-CsHsFe(CO)2CH=CHCH=CHCH3 ( 85) has been obtained in 38% yield by photochemical decarbonylation of (E, E)-FpCOCH=CHCH=CHCH 3 in ether/benzene at -5°C [190], see also [198].…”