63511-61-5Relevant academic research and scientific papers
Effect of ligand nonplanarity and solvent nature on the kinetic stability of zinc porphyrin complexes
Berezin,Shukhto,Shatunov
, p. 997 - 1004 (2008/12/21)
Planarity disturbance in metal porphyrin macrorings produces destabilization of complexes in dimethyl sulfoxide-acetic acid and benzene-acetic acid systems, except for cases where the coordination center is additionally stabilized by endocyclic substituents and/or extra ligands. The first dissociation stage of complexes with N-substituted analogs of porphyrins involves substitution of the acido ligand in the strongly shielded coordination sphere by an electron-donor solvent molecule. The revealed dependences of dissociation rate constants on acid concentration in DMSO, untypical of most metal porphyrins, are explained by a change in the type of the attacking species with changing solvent composition. The dissociation rate constants of complexes in an electron donor solvent can be lower by several orders of magnitude than in a weakly solvating medium.
Microwave-assisted Piloty-Robinson synthesis of 3,4-disubstituted pyrroles
Milgram, Benjamin C.,Eskildsen, Katrine,Richter, Steven M.,Scheidt, W. Robert,Scheidt, Karl A.
, p. 3941 - 3944 (2008/02/01)
(Chemical Equation Presented) The synthesis of N-acyl 3,4-disubstituted pyrroles can be accomplished directly from hydrazine and an aldehyde via a Piloty-Robinson pyrrole synthesis. The use of microwave radiation for the cyclization and pyrrole formation
Phenyl-substituted porphyrins. 1. Synthesis of meso-phenyl-substituted porphyrins
Syrbu,Lyubimova,Semeikin
, p. 1262 - 1270 (2007/10/03)
A method was developed for the synthesis of a series of meso-phenyl-substituted octaalkylporphyrins with various numbers of phenyl groups at various positions. Some of their properties were studied.
Dissociation kinetics of copper and cobalt complexes with sterically distorted porphyrins
Kuvshinova,Kuz'min,Dudkina,Pukhovskaya,Semeikin,Golubchikov
, p. 133 - 136 (2007/10/03)
The dissociation kinetics of the cobalt and copper complexes with octaethylporphyrin, its 5-phenyl, 5,15-diphenyl, and 5,10,15,20-tetraphenyl derivatives, and dodecaphenylporphyrin in acetic acid with small additions of trifluoroacetic acid were studied. In this series of complexes, the steric distortion of the tetrapyrrole macrocycle sequentially increases, which results in a regular decrease in the kinetic stability of the metal porphyrins: The dissociation rate increases by three orders of magnitude.
Kinetics of Complex Formation of Sterically Distorted Porphyrins with Copper Acetate in Pyridine and Dimethylformamide
Dudkina,Shatunov,Kuvshinova,Pukhovskaya,Semeikin,Golubchikov
, p. 1955 - 1960 (2007/10/03)
The kinetics of complex formation of octaethylporphine, 5-monophenyloctaethylporphyrin, 5,15-diphenyloctaethylporphyrin, 5,10,15,20-tetraphenyloctaethylporphyrin, and dodecaphenylporphyrin with copper acetate in pyridine and dimethylformamide was studied.
Synthesis and structural characterization of nonplanar tetraphenylporphyrins with graded degree of β-ethyl substitution
Kalisch, Werner W.,Senge, Mathias O.
, p. 1183 - 1186 (2007/10/03)
Tetraphenylporphyrins bearing two, four, and six β-ethyl groups have been synthesized by mixed condensation of benzaldehyde with diethylpyrrole and pyrrole. Investigation of all isomers by spectroscopy and X-ray crystallography shows a series of porphyrins with graded degree of nonplanarity depending on number and position of the ethyl substituents.
Nonplanar porphyrins. X-ray structures of (2,3,7,8,12,13,17,18-octaethyl- and -octamethyl-5,10,15,20-tetraphenylporphinato)zinc(II)
Barkigia, Kathleen M.,Dolores Berber,Fajer, Jack,Medforth, Craig J.,Renner, Mark W.,Smith, Kevin M.
, p. 8851 - 8857 (2007/10/02)
X-ray structures of the peripherally crowded porphyrins, (2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenyl-porphinato)Zn(II)-3MeOH solvate (ZnOETPP-3MeOH) and (2,3,7,8,12,13,17,18-octamethyl-5,10,15,20-tetraphenyl-porphinato)Zn(II)- pyridine-2HCClsub
