期刊
COORDINATION CHEMISTRY REVIEWS
卷 306, 期 -, 页码 468-482出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2015.01.006
关键词
Frustrated Lewis pairs; Nitric oxide; Carbon monoxide; Isonitriles; Cooperative addition
资金
- Deutsche Forschungsgemeinschaft
- Alexander von Humboldt-Stiftung
- European Research Council
- US National Science Foundation [CHE-0957606]
- American Chemical Society Petroleum Research Fund (PRF) [51971-ND3]
The unsaturated vicinal phosphane/borane frustrated Lewis pairs (P/B FLPs) Ph2PC(p-tolyl) = C(R)B(C6F5)(2) (R= C6F5 or CH3) react with tert-butyl isocyanide to give an equilibrium mixture of the starting materials, the borane/isonitrile adduct and the P/B addition product to the isonitrile carbon atom. The cooperative 1,1-adducts were exclusively formed upon treatment of these FLPs with n-butyl isocyanide. The saturated vicinal FLP Mes(2)PCH(2)CH(2)B(C6F5)(2) reacts analogously with carbon monoxide yielding the respective five-membered zwitterionic carbonyl heterocycle. Similarly cooperative CO addition was observed starting from a norbornane based vicinal P/B FLP. These saturated vicinal P/B FLPs (and several related systems) undergo analogous cooperative 1,1-addition reactions to nitric oxide (NO) to give the corresponding persistent five-membered heterocyclic FLP-NO nitroxide radicals. They were characterized spectroscopically and by X-ray diffraction and shown to undergo typical N-oxyl radical reactions. Some vicinal P/B FLPs also undergo 1,1-addition reactions to mesityl azide. Anomalous Staudinger reactions were observed to take place upon subsequent thermolysis or (in one case) photolysis. (C) 2015 Elsevier B.V. All rights reserved.
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