Cobaloximes with mixed dioximes having C and S side chains: Synthesis, structure and reactivity |
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Authors: | Gargi Dutta |
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Institution: | a Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, India b Bahra University, Waknaghat, Shimla Hills 173215, India |
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Abstract: | Ten mixed dioxime complexes RCo(L)(dmgH)Py R = Cl, Me, Et, Bu, Benzyl] L = dSPhgH (1-5) and dSEtgH (6-10)] have been synthesized and characterized by NMR. Formation of 1 and 6 is very fast and takes only 5 and 15 min in ethanol. Molecular oxygen insertion in 5 and 10 is monitored and forms mixture of products within 5 min. The crystal structure of 1, 4, 5, 6, 8 and 10 is reported. Benzyl ring is oriented over dmgH wing in both 5 and 10 and has a weak C-H…π interaction (3.33 Å and 3.22 Å) and this causes high upfield shift of the dmgH protons. Electrochemical study on 1, 4, 5, 6, 8 and 10 is also reported. Because of increased electron donation by SEt group, 6 is more difficult to reduce than 1. |
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Keywords: | Mixed dioximes Equilibration Reaction monitoring |
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