Gas-Phase Investigations on the Transmetalation Step in Sonogashira Reactions
摘要:
The microscopic reverse of the transmetalation step in the Pd/M (M = Cu, Ag, Au) catalyzed Sonogashira-type reactions has been observed in the gas phase upon collision-induced dissociation (CID) of the heterobimetallic complexes. Measuring the activation energies by quantitative energy-resolved CID experiments provides an upper bound for the internal rearrangement energies. The potential-energy surface is investigated by density functional theory calculations and compared to the experimental values.
Transition metal–carbon bonds. Part XLII. Complexes of nickel, palladium, platinum, rhodium and iridium with the tridentate ligand 2,6-bis[(di-t-butylphosphino)methyl]phenyl
作者:Christopher J. Moulton、Bernard L. Shaw
DOI:10.1039/dt9760001020
日期:——
The bulky diphosphine 1,3-[(di-t-butylphosphino)methyl]benzene undergoes metallation very readily to give a new type of tridentate chelating system, 2,6-bis[(di-t-butylphosphino)methyl]phenyl (pcp). Complexes prepared are of the types [MX(pcp)](M = Ni, Pd, or Pt; X = Cl, Br, H, C⋮CPh, or CN; M = Rh, X = CO), [MHCl(pcp)](M = Rh or Ir), and [IrHCl(CO)(pcp)]. [Ni(CO)(pcp)][BPh4] was also prepared. 1H-
庞大的二膦1,3-[(二叔丁基膦基)甲基]苯很容易进行金属化反应,从而得到一种新型的三齿螯合体系,即2,6-双[(二叔丁基膦基)甲基]苯基(pCP )。制备的复合物的类型为[MX(pCP)](M = Ni,Pd或Pt; X = Cl,Br,H,C⋮CPh或CN; M = Rh,X = CO),[MHCl(pCP )](M = Rh或Ir)和[IrHCl(CO)(pCP)]。还制备了[Ni(CO)(pCP)] [BPh 4 ]。给出了1 H-和31 P-nmr数据以及ir数据。