The use of nickel phosphine complexes Ni(PPh3)2Cl2, Ni(PBu2),Cl2, NiCl2(dppp), NICl2(dppe) andanhydrous NiCl2 (free of ligand) has effectivelypromoted the cross-coupling reaction of Grignardreagent with thiophenyl handes. This reaction can beeasily applied to the synthesis of a-terthienyl.
上一句：This paper tries to define what International Business English (IBE) is by analyzing its development and the classification of English for Special Purposes (ESP). The authors think that IBE is an applied subject relating to other subjects. It is also a very important branch of ESP.
下一句：This grade combines high hardness with good transverse rupture value and a specially combined binder of 3.5% is protecting cutting edges from corrosion effects, when heat and synthetic coatings create extremely aggressive working conditions, The Sinter-HIP process applied for this grade further increases the already high quality level.