Iron(III)chloride oxidation of tricarbonyl(vinylketene)iron(0)-alkyne adducts

Synthesis and Characterization of Novel Iron(0) Complexes Derived from α,β-Unsaturated-Ketone Analogues with β-Positioned Heteroatoms Containing Covalent and Coordination Bonds

“…The ever-growing and longstanding interest in Fe(0) complexes stems mainly from their structural diversity and widespread applications. Nowadays, the utility of such compoundsmainly issued from conventional α,β-unsaturated systemsranges, inter alia, from potential new applications in organic synthetic chemistry to the usual efforts in understanding fundamental chemistry and physical properties. − …”

Halogenated catechols from cycloaddition reactions of η4-(2-ethoxyvinylketene)iron(0) complexes with 1-haloalkynes

“…It seems most likely that the regioselectivity is established when the η 2 -complex forms the insertion product. Analogy with the work of Gibson 17, 18, 22 suggests that insertion occurs first at the ketene carbonyl rather than at the terminal allylic carbon of the vinylketene. Reductive elimination to form a cyclohexadienone, followed by tautomerization provides the catechol.…”

Cycloadditions and Cyclizations of Acetylenic, Allenic, and Conjugated Dienyl Sulfones

“…Intramolecular cyclizations of vinyl allenic sulfones 512 , acetylenic sulfones 514 , and bis(alkynyl) sulfone 516 were catalyzed by the Grubbs’ second generation catalyst 513 , the rhodium complex 515 , and the platinum complex 517 , respectively (Scheme ). Acetylenic sulfone 1 reacted with the iron tricarbonyl complex 518 , followed by oxidation or carbonylation of the metallacycle 519 , as indicated in Scheme . The regioisomer 520 failed to undergo these further transformations.…”