Highly Efficient Regio- and Stereoselective Dimerization of (Hetero)aromatic Terminal Alkynes by Organo Rare-Earth Metal Catalysts
作者:Shaozhong Ge、Victor F. Quiroga Norambuena、Bart Hessen
DOI:10.1021/om700893f
日期:2007.12.1
4-diazepan-6-amine), activated by [PhNMe2H][B(C6F5)4], catalytically dimerizes a range of (hetero)aromatic alkynes to Z-enynes with 100% selectivity and high rates. Catalyst turnovers up to 2000 were readily achieved in preparative scale (5–10 mmol) reactions. For comparison, the related E-enynes were produced with a permethyl lanthanocene catalyst.