Stabilization of NH Tautomers of Quinolines by Osmium and Ruthenium
- 20 September 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 128 (40) , 13044-13045
- https://doi.org/10.1021/ja064979l
Abstract
Complexes OsH2Cl2(PiPr3)2 and RuH2Cl2(PiPr3)2 promote the tautomerization of quinoline and 8-methylquinoline to NH tautomers, which lie about 44 kcal·mol-1 above the usual CH tautomers. The NH tautomers are stabilized by coordination to the metal center and by means of a Cl···HN interaction. As a consequence, the six-coordinate elongated dihydrogen complexes OsCl2{κ-C2-(HNC9H5R)}(η2-H2)(PiPr3)2, the five-coordinate derivatives RuCl2{κ-C2-(HNC9H5R)}(PiPr3)2, and the six-coordinate dihydrogen compounds RuCl2{κ-C2-(HNC9H5R)}(η2-H2)(PiPr3)2 (R = H, Me) have been isolated and characterized.Keywords
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