Zn-porphyrin with bipyridyl units at the ends of a conjugated chain, in addition to two alkyl side chains, was prepared as an artificial allosteric system. The axial ligand-binding ability of the compound was considerably reduced by the formation of a Fe(bpy)(3)-type complex. The degree of the allosteric suppression strongly depended on both alkyl chain length and the steric demand of the pyridyl ligand. (C) 2013 Elsevier Ltd. All rights reserved.
Anti-Markovnikov hydroimination of terminal alkynes in gold-catalyzed pyridine construction from ammonia