Generation of an (alkoxycarbonyl)rhodium complex in an alcohol analog of the water-gas shift reaction
摘要:
(Octaethylporphyrinato)rhodium(II) dimer ((OEPRh)2, 1) reacts with CO and ethanol in CH2Cl2 to give (octaethylporphyrinato)rhodium(III) chloride (5), (ethoxycarbonyl)(octaethylporphyrinato) rhodium(III) (OEPRh(CO)OEt, 6), and formyl(octaethylporphyrinato)rhodium-(III) (2). The structure of 6 was clarified by X-ray diffraction analysis. Complex 6 crystallized in the monoclinic space group P2(1)/n (No. 14) with a = 14.581 (1) angstrom, b = 14.181 (2) angstrom, c = 17.4530 (9) angstrom, V = 3608.8 (9) angstrom3, Z = 4, R = 0.046, R(w) = 0.051, and T = 293 K for 415 parameters and 4864 reflections. The H-1 and C-13 spectral properties of 2 and 6 in CD2Cl2 were determined and the behaviors of 1, 2, (octaethylporphyrinato)rhodium(III) hydride (3), and 6 in CH2Cl2 solvent were examined. Photolysis of 2 in CH2Cl2 at 300 nm afforded (octaethylporphyrinato)rhodium-(III) chloride. Treatment of OEPCoNa with acetic anhydride in ethylene glycol dimethyl ether afforded acetyl(octaethylporphyrinato)cobalt(III) and an analogous experiment with acetic formic anhydride generated an acyl(octaethylporphyrinato)cobalt(III) complex.
ruffle of the porphyrin increases with the number of meso substituents. (Octaethylporphyrin)nickel(II) undergoes nucleophilic substitution reactions upon treatment with alkylating reagents such as butyllithium, hydrolysis with water, and oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone [DDQ; Eq. (a)]. Alkylation can be achieved at all four meso positions, and access is provided to new nonplanar
Not Limited to Iron: A Cobalt Heme–NO Model Facilitates N–N Coupling with External NO in the Presence of a Lewis Acid to Generate N
<sub>2</sub>
O
作者:Erwin G. Abucayon、Rahul L. Khade、Douglas R. Powell、Yong Zhang、George B. Richter‐Addo
DOI:10.1002/anie.201909137
日期:2019.12.16
N2 O. We previously reported that a heme Fe-NO model engages in this N-N bond-forming reaction with NO. We now demonstrate that (OEP)CoII (NO) similarly reacts with 1 equiv of NO in the presence of the Lewisacids BX3 (X=F, C6 F5 ) to generate N2 O. DFT calculations support retention of the CoII oxidation state for the experimentally observed adduct (OEP)CoII (NO⋅BF3 ), the presumed hyponitrite intermediate
Cobalt(II) nitrosyl cation radicals of porphyrins, chlorins, and isobacteriochlorins. Models for nitrite and sulfite reductases and implications for A1u heme radicals
作者:Etsuko Fujita、C. K. Chang、Jack Fajer
DOI:10.1021/ja00311a073
日期:1985.12
visible, IR et RPE. Ce sont des especes presentes dans des enzymes qui catalysent des reductions de nitrite en NH 3 ou oxyde nitrique (nitritereductase). On a d'autre part recemment identifie l'isobacteriochlorine de cobalt dans des sulfitereductases qui sont aussi capables de reduire des nitrites
L'oxydation de complexes «nitrosyle» de Cobalt(II) de different porphyrines Fournit des radicaux π-cationiques de Co(II) NO. Les especes oxydees sont caracterisees parelectrochimie, spectroscopie visible, IR et RPE。Ce sont des especes 介绍了 dans desases qui catalysent des reductions de亚硝酸盐 en NH 3 ou oxyde Nique(亚硝酸盐还原酶)。在 a d'autre part recemment identifie l'isobacteriochlorine de coco dans des 亚硫酸盐还原酶
Mechanism of Four-Electron Reduction of Dioxygen to Water by Ferrocene Derivatives in the Presence of Perchloric Acid in Benzonitrile, Catalyzed by Cofacial Dicobalt Porphyrins
作者:Shunichi Fukuzumi、Ken Okamoto、Claude P. Gros、Roger Guilard
DOI:10.1021/ja048403c
日期:2004.8.1
reduction is not as efficient as in the case of Co(2)(DPX). The micro-superoxo species of cofacial dicobalt porphyrins were produced by the reactions of cofacial dicobalt(II) porphyrins with dioxygen in the presence of a bulky base and the subsequent one-electron oxidation of the resulting micro-peroxo species by iodine. The superhyperfine structure due to two equivalent cobalt nuclei was observed
Reaction de OEP Co(III) (H 2 O) 2 ClO 4 avec un exces d'acetylenique R 1 C≡CR 2 en presence de FeCl 3 dans CH 2 Cl 2 et lavage a HClO 4 . OEP=l'octaethyl porphyrine. R 1 =H,CH 2 OH,C 6 H 5 et R 2 =H,n-C 4 H 9 ,CH 2 OH,C 6 H 5
反应 de OEP Co(III) (H 2 O) 2 ClO 4 avec un exces d'acetylenique R 1 C≡CR 2 en存在 de FeCl 3 dans CH 2 Cl 2 et 灌洗 HClO 4 。OEP=1'八乙基卟啉。R 1 =H,CH 2 OH,C 6 H 5 等 R 2 =H,nC 4 H 9 ,CH 2 OH,C 6 H 5