Protonation of Cobalt-Allene Constitutional Isomers: Highly Selective Formation of Cobalt-Allyl and Oxacobaltacyclopentadiene Complexes

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50780

Title:	Protonation of Cobalt-Allene Constitutional Isomers: Highly Selective Formation of Cobalt-Allyl and Oxacobaltacyclopentadiene Complexes
Authors:	;Connor,JM;Chen,MC;Holland,RL
Contributors:	化學學系
Keywords:	ORGANOMETALLIC PI-COMPLEXES;CUMULENE SYSTEMS;CONVERSION;ALKYNE;METALLACYCLOBUTENE;POLYMERIZATION;CYCLIZATION;CHEMISTRY;INSERTION;CATIONS
Date:	2010
Issue Date:	2012-03-27 18:10:01 (UTC+8)
Publisher:	國立中央大學
Abstract:	The first reactivity studies of mononuclear cobalt-allene complexes are reported. The isomeric cobalt-allene complexes (RS,RS,Z)-[(eta(5)-C(5)H(5))Co(1,2-eta(2)-CH(SO(2)Ph)= C=CH(CO(2)Et))] (2-Z) and (SR,RS,E)-[(eta(5)-C(5)H(5))Co(2, 3-eta(2)-CH(SO(2)Ph)=C=CH(CO(2)Et))] (3-E) undergo protonation with HBF(4) to give the cationic pi-allyl complex (eta(5)-C(5)H(5))Co(PPh(3))[exo-eta(3)-CH(CO(2)Et)CHCH(SO(2)Ph)](BF(4)) (4) and the first structurally characterized oxacobaltacyclopentadiene complex, (eta(5)-C(5)H(5))Co(PPh(3))[kappa(2)-OC(OEt)CH=C(CH(2)SO(2)Ph)](BF(4)) (5-BF(4)), respectively. Deprotonation of 5-BF(4) regenerates cobalt-allene complex 3-E, as well as 2-Z.
Relation:	ORGANOMETALLICS
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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