Protonation of cobalt-allene constitutional isomers: Highly selective formation of cobalt-allyl and oxacobaltacyclopentadiene complexes

Joseph M. O'Connor, Ming Chou Chen, Ryan L. Holland

Research output: Contribution to journalArticlepeer-review

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Abstract

The first reactivity studies of mononuclear cobalt-allene complexes are reported. The isomeric cobalt-allene complexes (RS,RS,Z)-[(η5- C5H5)Co(1,2-η2-CH(SO2Ph)=C= CH(CO2Et))] (2-Z) and (SR,RS,E)-[(η5-C 5H5)Co(2,3-η2-CH(SO2Ph)=C= CH(CO2Et))] (3-E) undergo protonation with HBF4 to give the cationic π-allyl complex (η5-C5H 5)Co(PPh3)[exo-η3-CH(CO2Et) CHCH(SO2Ph)](BF4) (4) and the first structurally characterized oxacobaltacyclopentadiene complex, (η5-C 5H5)Co(PPh3)[κ2-OC(OEt)CH= C(CH2SO2Ph)](BF4) (5-BF4), respectively. Deprotonation of 5-BF4 regenerates cobalt-allene complex 3-E, as well as 2-Z.

Original languageEnglish
Pages (from-to)6161-6164
Number of pages4
JournalOrganometallics
Volume29
Issue number23
DOIs
StatePublished - 13 Dec 2010

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