- Electronically variable imino-phenanthrolinyl-cobalt complexes; synthesis, structures and ethylene oligomerisation studies
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The 2-imino-1,10-phenanthroline ligands, 1,10-C12H7N2-2-CR{double bond, long}N(2,6-i-Pr2-4-R1-C6H2) [R = R1 = H (L1); R = H, R1 = Br (L2); R = H, R1 = CN (L3); R = H, R1 = i-Pr (L4); R = Me, R1 = H (L5); R = Me, R1 = i-Pr (L6)], have been prepared in high yield from the condensation reaction of 1,10-C12H7N2-2-CR{double bond, long}O (R = H, Me) with one equivalent of the corresponding 4-substituted 2,6-diisopropylaniline. The molecular structures of L2, L5 and L6 reveal the imino nitrogen atoms to adopt a transoid configuration with respect to the phenanthrolinyl nitrogen atoms. Treatment of Lx with one equivalent of CoCl2 in n-BuOH at 90 °C gives the high spin complexes, (Lx)CoCl2 [Lx = L1 (1a), L2 (1b), L3 (1c), L4 (1d), L5 (1e), L6 (1f)], in which the metal centres exhibit distorted square pyramidal geometries. Activation of 1a-1f with excess methylaluminoxane (MAO) gives catalysts that are modestly active for the oligomerisation of ethylene affording mainly linear α-olefins along with some degree of internal olefins. While the donor capability of the 4-position of the N-aryl group does not appear to affect the activity of the catalyst, it does have an influence on the ratio of α-olefins to internal olefins. Single crystal X-ray diffraction studies have been performed on L2, L5, L6, 1a, 1c and 1f.
- Pelletier, Jérémie D.A.,Champouret, Yohan D.M.,Cadarso, Jesus,Clowes, Lucy,Ga?ete, Marcos,Singh, Kuldip,Thanarajasingham, Vakesan,Solan, Gregory A.
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p. 4114 - 4123
(2007/10/03)
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- Carboxylic and Phosphate Ester Hydrolysis Catalysed by Bivalent Zinc and Coper Metallosurfactants
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The synthesis of three new lipophilic ligands are reported: Nα-(1,10-phenanthrolin-2-ylmethyl)-N-τ-dodecylhistamine (1), N-dodecyl-2-aminomethyl-1,10-phenanthroline (2), and Nα-(2-pyridylmethyl)-Nτ-dodecylhistam
- Weijnen, John G. F.,Koudijs, Arie,Engbersen, Johan F. J.
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p. 1121 - 1126
(2007/10/02)
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- The Synthesis of 1,10-Phenanthroline Esters Containing Unsaturated C18J Side Chains
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Octadeca-6,9,12-trienyl 3,4,7,8-tetramethyl-1,10-phenanthroline-2-carboxylate and 3,7,8-trimethyl-1,10-phenanthrolin-4-ylmethyl octadeca-9-12-15-trienoate have been synthesized.Furthermore, two series of 1,10-phenanthroline esters substituted in the 2-position with C18 unsaturated side chains have also been synthesized.
- Holan, George,Wernert, Gregory T.
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p. 873 - 881
(2007/10/02)
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