Copper(<scp>i</scp>)-catalysed transfer hydrogenations with ammonia borane
作者:Eva Korytiaková、Niklas O. Thiel、Felix Pape、Johannes F. Teichert
DOI:10.1039/c6cc09067b
日期:——
Highly Z-selective alkyne transfer semihydrogenations and conjugate transferhydrogenations of enoates can be effected by employing a readily available copper(I)/N-heterocyclic carbene (NHC) complex, [IPrCuOH], in combination with ammoniaborane as a H2 equivalent.
Stereoselective alkyne semihydrogenations with an air-stable copper(<scp>i</scp>) catalyst
作者:Niklas O. Thiel、Johannes F. Teichert
DOI:10.1039/c6ob02271e
日期:——
An air-stable and preactivated copper(I) hydroxide/N-heteroyclic carbene (NHC) complex for alkynesemihydrogenations is reported. Next to an enhanced practicability of the process, the resulting alkenes are obtained with high Z-selectivities and no overreduction to the corresponding alkanes.
Novel Synthesis of Disubstituted Alkyne Using Molybdenum Catalyzed Cross-Alkyne Metathesis
作者:Naotake Kaneta、Ken Hikichi、Shin-ichi Asaka、Motokazu Uemura、Miwako Mori
DOI:10.1246/cl.1995.1055
日期:1995.11
A novel disubstitutedalkyne synthesis was developed using molybdenum catalyzed cross-alkyne metathesis by Mortreux’s catalyst [Mo(CO)6-p-ClC6H4OH]. The reaction was carried out using Mo(CO)6 (5 mol% for total amounts of alkynes) and p-ClC6H4OH (1 equiv.) in the presence of an excess amount of another alkyne (3∼11 equiv.) in refluxing toluene.