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A NEW MODEL-COMPOUND FOR VITAMIN-B12 COENZYME - SYNTHESIS AND CRYSTAL-STRUCTURE OF A TETRAAZAMACROCYCLIC ALKYLCOBALT(III) COMPOUND WITH A PENDANT COORDINATING ALKYL ARM

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Abstract

A novel reaction between norbornene and the cobalt(II) complex of the tetraazamacrocyclic ligand 5,14-dihydro-6,8,15,17-tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecine (H2L), in the presence of oxygen, gives the 5,16-dihydro-16-(exo-norbornane-2,3-diyl-kappa C2)-6,8,15,17-tetramethyldibenzo[b,i][1,4,8, 11]tetraazadecinato-kappa-4-N5,9,14,18cobalt(III) cation (A); this was isolated as [mono(acetone)-{5,16-dihydro-16-(exo-norbornane-2,3-diyl-kappa C2)6, 8, 15, 17-tetramethyldibenzo[b,i[1, 4, 8, 11]tetraazadecinato-kappa-4N5,9,14,18}cobalt(III)] tetraphenylborate, and its X-ray crystal structure establishes the presence of a pendant alkyl-cobalt bond

Topics: QD
Publisher: ROYAL SOC CHEMISTRY
OAI identifier: oai:wrap.warwick.ac.uk:21822
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