The phenol countdown: Novel imidazole‐based phosphineligands are synthesized on scales up to 100 g by a convenient lithiation–phosphorylation method. The phosphines are stable towards air and moisture and are successfully applied as ligands in the palladium‐catalyzed selectivehydroxylation of arylhalides (see scheme, dba=dibenzylideneacetone).
A New, Efficient and Recyclable Lanthanum(III) Oxide- Catalyzed CN Cross-Coupling
作者:S. Narayana Murthy、B. Madhav、V. Prakash Reddy、Y. V. D. Nageswar
DOI:10.1002/adsc.200900691
日期:2010.12.17
A new and efficient protocol for the CN cross-coupling of aryl halides with heteroaromatic amines in the presence of lanthanum(III) oxide (10 mol%) as a recyclable catalyst, N,N′-dimethylethylenediamine (DMEDA) (20 mol%) and potassium hydroxide (KOH) as a base in dimethyl sulfoxide (DMSO) at 110 °C has been developed. This inexpensive catalytic system is highly effective towards the amination of aryl