Sodium triethylborohydride – {commonly|generally|typically|frequently|normally|usually} {used|utilized|employed|utilised|applied|made use of} as a {reducing|decreasing|lowering|minimizing} agent for hydroboration catalysts {based|primarily based} {on the|around the} first-row transition metal complexes with tridentate ligands, has been {found|discovered|identified|located} a {highly|extremely|very|hugely} selective catalyst for hydroboration of terminal alkynes. Hydroboration of aromatic and aliphatic alkynes with pinacolborane {in the|within the|inside the} presence of {10|ten} mol% of NaHBEt3 proceeded {in a|inside a|within a} {highly|extremely|very|hugely} selective manner {to give|to provide|to offer} (E)-vinylboronate esters with {high|higher} yields, whereas ethynylsilanes {seem|appear|look} {to be|to become} {less|much less|significantly less} reactive {in this|within this} {process|procedure|method|approach|course of action}. 2,2-Dimethyl-1,3-dioxan-5-one supplier (S)-4-(1-Aminoethyl)phenol hydrobromide uses PMID:24268253
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