Meso-Tetraphenyl

Poly (vinyl pyrrol idones) polymerization, 1, 271 Polyviologens synthesis, 1, 286 Pomeranz-Fritsch synthesis isoqutnolines, 2, 428 6, 218 Pongapin synthesis, 4, 710 Poranthericine, 4, 494 ( )-Porantherine synthesis, 2, 377 Porphin, 4, 386 structure, 4, 378 Porphin, mcso-aryltri-p-tolyl-synthesis, 4, 230 Porphin, mcso-tetraalkyl-synthesis, 4, 230 Porphin, mcso-tetraaryl-synthesis, 4, 230 Porphin, mcso-tetraferrocenyl-synthesis, 4, 230 Porphin, meso-tetraphenyl-synthesis, 7, 767 Porphobilinogen biosynthesis, 1, 100... 

From Ref. 287) b Rh piv = Rh2(OOCCMe3)4 RhTPPI = iodorhodium(III) meso-tetraphenyl-porphyrin (47a) Rh TMPI = iodorhodium(III) meso-tetramesitylporphyrin (47c) c Ratio of CH3 CH2 insertion, corrected for number of H atoms. 

The Lewis acid-Lewis base interaction outlined in Scheme 43 also explains the formation of alkylrhodium complexes 414 from iodorhodium(III) meso-tetraphenyl-porphyrin 409 and various diazo compounds (Scheme 42)398), It seems reasonable to assume that intermediates 418 or 419 (corresponding to 415 and 417 in Scheme 43) are trapped by an added nucleophile in the reaction with ethyl diazoacetate, and that similar intermediates, by proton loss, give rise to vinylrhodium complexes from ethyl 2-diazopropionate or dimethyl diazosuccinate. As the rhodium porphyrin 409 is also an efficient catalyst for cyclopropanation of olefins with ethyl diazoacetate 87,1°°), stj bene formation from aryl diazomethanes 358 and carbene insertion into aliphatic C—H bonds 287, intermediates 418 or 419 are likely to be part of the mechanistic scheme of these reactions, too. 

The zinc(II) complexes of meso-tetraphenyltetrabenzoporphyrin (38) and of meso-tetraphenyl-tetranaphthoporphyrin (39) have been prepared 173-175 some photophysical properties of this interesting series are given in Table 11176 Photooxidation of zinc(II) porphyrins causes cleavage of the macrocycle with formation of bilinone derivatives.122 206 207... 

According to [96], electrochemical methods, especially the application of cyclic voltammetry, could be a powerful tool to find suitable catalysts for NO removal from combustion products. Investigation of electrocatalytic properties of vitamin B12 toward oxidation and reduction of nitric oxide was reported in [97]. The catalytic activity of meso-tetraphenyl-porphyrin cobalt for nitric oxide oxidation in methanolic solution and in Nafion film was reported in [98]. 

The dependence of the principal components of the nuclear magnetic resonance (NMR) chemical shift tensor of non-hydrogen nuclei in model dipeptides is investigated. It is observed that the principal axis system of the chemical shift tensors of the carbonyl carbon and the amide nitrogen are intimately linked to the amide plane. On the other hand, there is no clear relationship between the alpha carbon chemical shift tensor and the molecular framework. However, the projection of this tensor on the C-H vector reveals interesting trends that one may use in peptide secondary structure determination. Effects of hydrogen bonding on the chemical shift tensor will also be discussed. The dependence of the chemical shift on ionic distance has also been studied in Rb halides and mixed halides. Lastly, the presence of motion can have dramatic effects on the observed NMR chemical shift tensor as illustrated by a nitrosyl meso-tetraphenyl porphinato cobalt (III) complex. 

The cobalt atom is essential to drive the reaction towards the formation of the corrole ring other metals, such as Mn, Fe or Rh, in similar conditions give the expected meso-tetraphenyl-octamethylporphyrin in a mixture with its metal complexes. 

An electrochemical study of Ni meso-tetraphenyl-homoporhyrins, -secochlorins, and -chlorophinhas shown that... 

From Ref. 287). b pjy = Rhj(OOCCMej) RhTPPI iodorhodium(III) meso- -tetraphenyl-... 

Figure 6.4.1 Molecular structure and UV/vis spectrum of the diprotonated meso-tetraphenyl-porphyrin dication.

In aqueous solution or in water (methanol 1 1), tetracationic porphyrins form molecular assemblies with tetraanionic porphyrins, e.g., meso-tetraphenyl-sulfonato- with meso-tetramethylpyridinium porphyrin. Such assemblies are, however, ill-defined with respect to structure and aggregation number because both surfaces of the chromophores behave identically. They tend to polymerize and precipitate. Only when stereochemically fitting porphyrins are combined by charge interactions and polymerization is prevented by alkyl substituents does one obtain well-defined heterodimers. This has been realized with an isomer mixture of four p-pyridinium—ethyl porphyrins (solubility = 10" M) and meso-tetraphenylsulfonato porphyrin (same solubility) (Scheme 6.6.1). In this case, the porphyrins are forced into close proximity by four charge-charge interactions and into a face-to-face position by the arrangement of charges. The inability of... 

Evans, B., Smith, K. M., Fuhrhop, J.-H. (1977). Sterically crowded porphyrins meso-Tetraphenyl-octa-ethylporphyrin, Tetrahedron Lett., p. 443. 

Using a novel NMR shift reagent, for example cobalt(III)meso-tetraphenyl porphyrin (CoTPP), the conformation of (3) is found to be a mixture of many conformations. Theoretical and experimental results revealed ring current shift for (3) <90MRC343>. Electronic structure and conformational properties of the amide linkage were studied in lactams based on MNDO calculations and photoelectron spectroscopy <85Mi 9l8-oi>. 

Scheldt WR, Lee YJ, Hatano K (1984) Preparation and structural characterization of nitrosyl complexes of ferric porphyrinates. Molecular structure of aquonitrosyl (meso-tetraphenyl-porphinato)iron (III) perchlorate and nitrosyl (octaethylporphinato)iron (III) perchlorate. J Am Chem Soc 106 3191-3198... 

The effect of carboxylic anchoring group position with respect to the meso-tetraphenyl-substituted A3B-type ZnPs on PCE of the DSSC was evaluated in the above-mentioned research (Schemes 13 and 19) [28]. Moreover, the effect of the Zn atom introduced into free-base porphyrin and the steric effect of peripheral substituents on PCE were evaluated as well. 

KINETIC STUDY OF HYDROGEN TUNNELLING IN MESO-TETRAPHENYL PORPHINE BY NMR-LINESHAPE ANALYSIS AND SELECTIVE T p -RELAXATION TIME MEASUREMENTS ... 

Meso tetraphenyl porphyrin (c) O.OllM CHCl + Acetone-d 18% b (a) G 8... 

FlS 1 199 N J Hg meso tetraphenyl porphyrin with pyridine as ligand 340 Y14... 

The magnesium monoperoxyphthalate oxidation of indole, catalysed by the meso-tetraphenyl porphyrin FeClj, in H20-MeCN is of fractional order in both substrate and catalyst and the rate decreases with increasing H+ ion concentration and percentage of MeCN.22... 

The reason that C6H5CHO (ben) is more effective than (Me)2CHCHO (iso) in the Baeyer-Villiger oxidation of cyclohexanone with O2, catalysed by meso-tetraphenyl porphyrin chloride, is that the highly reactive high-valent Fe-porphyrin species is formed in the presence of (ben) and the less reactive peroxy isobutyric acid is formed in the presence of (iso). ... 

Rate retardation with increasing H" ions in the meso-tetraphenyl-porphyriniron(III) chloride-catalysed oxidation of substituted aniline by oxone in ACOH-H2O has been ascribed to the increasing concentration of less reactive protonated aniline species. The oxidation complied with the isokinetic relationship but no linear free energy relationships were found the solvent interaction had a role in the reactivity." ... 

A [5]rotaxane 10, based on a meso-tetraphenyl porphyrin and synthesized in 85% yield, showed similar pH-driven switching properties, depicted in Scheme 14.5. When all the nitrogen atoms of the amino groups are protonated, CB[6] prefers to encapsulate the protonated diaminotriazole site (state I) because of the strong ion-dipole interactions between ammonium ions and carbonyl functions at the portal of CB[6]. On the other hand, after complete deprotonation of the molecule, CB[6] resides mostly on the relatively more hydrophobic benzyl part, thanks to hydrophobic effect (state II). 

An interesting system for the catalytic aerobic oxidation of benzyl alcohol was developed by Albrecht and co-workers. A porphyrin rhodium(iii) complex [(IMe)2Rh(TPP)]Cl (TPP = meso-tetraphenyl porphyrin) with two apical NHC ligands led to porphyrin distortion and dearomatization. This coordi-natively saturated complex was catalytically active in the oxidation of benzyl alcohol. It was demonstrated that its catalytic activity was imparted by NHC dissociation, as facile cleavage of the Rh-NHC bond was promoted by the strong trans effect of the distal NHC ligand and by the distorted and partially dearomatized porphyrin. 

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