Sequence-Controlled Catalytic One-Pot Synthesis of Siloxane Oligomers |
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Authors: | Dr Kazuhiro Matsumoto Dr Shigeru Shimada Dr Kazuhiko Sato |
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Institution: | Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial, Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565 Japan |
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Abstract: | Silicones are highly valuable poly- and oligomeric materials with a broad range of applications due to their outstanding physicochemical properties. The core framework of silicone materials consists of siloxane (Si−O−Si) bonds, and thus, the development of efficient siloxane-bond-forming reactions has attracted much attention. However, these reactions, especially “catalytic” siloxane-bond-forming reactions that enable the selective formation of unsymmetrical siloxane bonds, remain relatively underdeveloped. On the other hand, controlled iteration has become a powerful tool for the sequence-controlled synthesis of poly- and oligomeric compounds. Recently, control over the siloxane sequence has been achieved by the one-pot iteration of a B(C6F5)3-catalyzed dehydrocarbonative cross-coupling of alkoxysilanes with hydrosilanes and a B(C6F5)3-catalyzed hydrosilylation of carbonyl compounds. Thus, it is now possible to generate linear, branched, and cyclic sequence-specific oligosiloxanes in a highly selective manner under chloride-free conditions. |
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Keywords: | boron controlled iteration homogeneous catalysis one-pot synthesis siloxanes |
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