The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Potassiumtris(1-pyrazolyl)borohydride( cas:18583-60-3 ) is researched.Application In Synthesis of Potassiumtris(1-pyrazolyl)borohydride.Tanke, Robins S.; Crabtree, Robert H. published the article 《Thermal and photochemical carbon-hydrogen bond reactions of alkenes in (tris(pyrazolyl)borato)iridium(I) complexes》 about this compound( cas:18583-60-3 ) in Inorganic Chemistry. Keywords: iridium pyrazolylborate complex; cyclooctenyl pyrazolylborate iridium complex; ethylene pyrazolylborate iridium complex; acrylate pyrazolylborate iridium complex. Let’s learn more about this compound (cas:18583-60-3).
[IrL2Cl]2 (L = cyclooctene or ethylene) reacts with KTp (Tp = hydrotris(1-pyrazolyl)borate) to give, in the cyclooctene case, TpIr(η3-cyclooctenyl)H and, in the ethylene case, TpIr(C2H4)2 (I). I reacts with CO at 1 atm, and 25°, to give the known TpIr(CO)2 and reacts with excess Me acrylate (MA) to give TpIr(C2H4)(MA). On irradiation, I gives TpIr(η2-C2H4)H(η1-vinyl). This appears to take place by intramol. vinyl C-H bond activation; η3-TpIr(C2H4) is proposed as the key intermediate. In the 1H NMR spectrum, the ethylene ligands of I show a singlet at room temperature for the vinylic protons, but decoalescence takes place at ca. 260K.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics