Fixation of carbon dioxide and related small molecules by a bifunctional frustrated pyrazolylborane Lewis pair
作者:Eileen Theuergarten、Janin Schlösser、Danny Schlüns、Matthias Freytag、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1039/c2dt30448a
日期:——
The bifunctional frustrated Lewispair 1-[bis(pentafluorophenyl)boryl]-3,5-di-tert-butyl-1H-pyrazole (1) was employed for small molecule fixation by reaction with carbondioxide, paraformaldehyde, tert-butyl isocyanate, tert-butyl isothiocyanate, methyl isothiocyanate and benzonitrile, affording the adducts 3–8 as zwitterionic, bicyclic boraheterocycles. Treatment of 1 with tert-butyl isocyanide gave
Intramolecular heterolytic dihydrogen cleavage by a bifunctional frustrated pyrazolylborane Lewis pair
作者:Eileen Theuergarten、Danny Schlüns、Jörg Grunenberg、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1039/c0cc03474f
日期:——
with 3,5-di-tert-butyl-1H-pyrazole (3) affords the zwitterionic pyrazolium-borate trans-5 and, after dehydrogenation by use of the frustratedcarbene-boraneLewispair 1/B(C(6)F(5))(3), the bifunctional pyrazolylborane 6, which is able to cleave dihydrogenheterolytically with the formation of a mixture of cis-5 and trans-5.