(μ2-Pinacolato-O,O')-bis(pinacolato-O,O')diboron

Synthesis of Catechol‐, Pinacol‐, and Neopentylglycolborane through the Heterogeneous Catalytic BB Hydrogenolysis of Diboranes(4)

“…Aside from the doublet signal for HBpin ( δ =28 ppm) and B 2 pin 2 ( δ =30 ppm),6d a broad signal, which corresponded to B 2 pin 3 , pinBOBpin, and/or HOBpin, was observed at δ =21 ppm 16. 17…”

“…Aside from the doublet signal for HBpin (d = 28 ppm) and B 2 pin 2 (d = 30 ppm), [6d] a broad signal, which corresponded to B 2 pin 3 , pinBOBpin, and/or HOBpin, was observed at d = 21 ppm. [16,17] To improve on these results, analogous palladium catalysts were applied to these reactions (Table 2). Under the same conditions as implemented for Pt on charcoal, palladium on charcoal gave much-better results for both boranes.…”

Iridium Phosphane Complexes Containing Arylspiroboronate Esters for the Hydroboration of Alkenes

“…[22] The dihydrogen adds to the starting alkene in the presence of an active catalyst system. Although the iridium complexes 2-6 could be used to effectively catalyse this isomerisation/hydroboration reaction, we will continue to investigate this reaction using other metal systems in an effort to reduce the amount of competing hydrogenation, the results of which will be presented in due course.…”

Beyond Dehydrocoupling: Group 2 Mediated Boron–Nitrogen Desilacoupling

“…[2] Afurther attempted catalytic reaction performed utilizing a5mol %loading of the b-diketiminato calcium amide [HC{(Me)CN-2,6-iPr 2 C 6 H 3 } 2 Ca{N(SiMe 3 ) 2 }(thf)] (3), however, provided similarly limited consumption of the Et 2 NH coupling partner at room temperature.Heating of this latter reaction to 60 8 8Calso provided no evidence of the desired heteronuclear coupling and yielded the previously reported pinacolborane redistribution product, (m 2 -pinacolato-O,O')-bis(pinacolato-O,O')diboron (B 2 pin 3 ), as the only identifiable new species. [8] We reasoned that this apparently limited onward reactivity was al ikely consequence of the sterically demanding Scheme4. Hypothetical magnesium-catalyzed boron-nitrogen "desilacoupling" reaction.…”