Rhodium‐Catalyzed Cross‐Cyclotrimerization and Dimerization of Allenes with Alkynes |
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| Authors: | Kazuki Sakashita Dr Yu Shibata Prof?Dr Ken Tanaka |
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| Institution: | 1. Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan;3. http://www.apc.titech.ac.jp/～ktanaka/ |
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| Abstract: | It has been established that a cationic rhodium(I)/binap complex catalyzes the cross‐cyclotrimerization of two molecules of a monosubstituted allene with one molecule of a functionalized alkyne to give 3,6‐dialkylidenecyclohex‐1‐enes. In contrast, the reactions involving di‐ or trisubstituted allenes and/or unfunctionalized alkynes afforded cross‐dimerization products, substituted dendralenes, through β‐hydrogen elimination from the corresponding rhodacycles. |
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| Keywords: | alkynes allenes cyclization dimerization rhodium |
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