Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-60402
Jiang, C; Blacque, O; Fox, T; Berke, H (2011). Reversible, metal-free hydrogen activation by frustrated Lewis pairs. Dalton Transactions, 40(5):1091-1097.
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The Lewis acid cyclohexylbis(pentafluorophenyl) boron 1, which exhibits about 15% lower Lewis acidity in comparison with B(C(6)F(5))(3), activates H(2) in the presence of the bulky Lewis bases 2,2,6,6-tetramethylpiperidine (TMP), 1,2,2,6,6-pentamethylpiperidine (PMP), tri-tert-butylphosphine (t-Bu(3)P) leading in facile reactions at room temperature to heterolytic splitting of dihydrogen and formation of the salts TMPH]CyBH(C(6)F(5))(2)] 2, PMPH]CyBH(C(6)F(5))(2)] 3 and t-Bu(3)PH]CyBH(C(6)F(5))(2)] 4, which could be dehydrogenated at higher temperatures. The related Lewis acid 1-phenyl-2-bis-(pentafluorophenyl) boryl]ethane 5 exhibiting about 10% lower Lewis acidity than B(C(6)F(5)) 3 is also capable of splitting H(2) in a heterolytic fashion in the presence of TMP, PMP and t-Bu3P yielding TMPH]PhC(2)H(4)BH(C(6)F(5))(2)] 6, PMPH]PhC(2)H(4)BH(C(6)F(5))(2)] 7 and t-Bu(3)PH]PhC(2)H(4)BH(C(6)F(5))(2)] 8. Under comparable conditions as for 2-4, the dehydrogenations of 6-8 were much slower. 4b and 6 were characterized by single crystal X-ray diffraction studies.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Deposited On:||14 Mar 2012 13:42|
|Last Modified:||04 Dec 2013 14:31|
|Publisher:||Royal Society of Chemistry|
|Free access at:||Publisher DOI. An embargo period may apply.|
|Other Identification Number:||ISI:000286390300016|
|Citations:||Web of Science®. Times Cited: 28|
Scopus®. Citation Count: 27
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