Novel ring-opening reaction of norbornadiene(tricarbonyl)iron: synthesis and crystal structure of C7H8(CO)2FeC(OEt)Ar

1988 ◽  
pp. 1296 ◽  
Author(s):  
Jiabi Chen ◽  
Guixin Lei ◽  
Meicheng Shao ◽  
Xiaojie Xu ◽  
Zeying Zhang
Keyword(s):  
Crystal Structure ◽  
Ring Opening ◽  
Synthesis And Crystal Structure ◽  
Ring Opening Reaction

Oxidation of copper(II) hydroxyporphyrin (oxophlorin); oxidative ring opening and formation of an ester-linked, dinuclear copper complex

2001 ◽  
Vol 79 (5-6) ◽  
pp. 922-929 ◽  
Author(s):  
Shane Phillips ◽  
Bruce C Noll ◽  
Marilyn M Olmstead ◽  
Alan L Balch
Keyword(s):  
Crystal Structure ◽  
Copper Complex ◽  
Epr Spectroscopy ◽  
Ring Opening ◽  
Oxidative Cleavage ◽  
Dinuclear Complex ◽  
Dinuclear Copper ◽  
Ring Opening Reaction ◽  
Copper Porphyrin ◽  
Ester Linkage

Addition of copper(II) acetate to octaethyl(meso-hydroxy)porphyrin (H2OEPOH) in THF under a dinitrogen atmosphere produces CuII(OEPOH), which has been isolated as red crystals and shown to have a meso-hydroxyporphyrin structure by UV-vis and EPR spectroscopy. CuII(OEPOH) undergoes oxidation by dioxygen to form a novel dinuclear copper complex {CuII(OEPOC(O)OEB)CuII}. This dinuclear complex is composed of a copper(II) meso-substituted porphyrin portion (with a planar CuN4 unit), which is attached through an ester linkage to a helical copper(II) tetrapyrrole that has been ring-opened through oxidative cleavage of a second molecule of CuII(OEPOH). The oxidative ring-opening reaction resembles that of natural heme catabolism but is arrested at a stage where the oxidized meso-carbon is still appended to the helical open tetrapyrrole. A mechanism is suggested for this process.Key words: copper porphyrin, crystal structure, porphyrin oxidation, linear tetrapyrrole, hydroxy-porphyrin, oxophlorin.

Crystal structure of racemic trans-2-(4-methylphenyl)-cyclohexanol

1994 ◽  
Vol 209 (10) ◽  
Author(s):  
K. Peters ◽  
E.-M. Peters ◽  
H. G. von Schnering ◽  
G. Bringmann ◽  
D. Leimkötter ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Ring Opening ◽  
Magnesium Bromide ◽  
Cyclohexene Oxide ◽  
Space Group ◽  
Triclinic System ◽  
Ring Opening Reaction

AbstractThe title compound was obtained by a copper-assisted ring opening reaction of cyclohexene oxide using 4-methylphenyl-magnesium-bromide. It crystallizes from n-pentane in the triclinic system, space group

On the Conrotatory Ring Opening of 3-Carbomethoxycyclobutene Vis-À-Vis 3-Carbomethoxy-1,2-Benzocyclobutene and the Predominant Inward Opening of 3-Dimethylaminocarbonyl-1,2-Benzocyclobutene

2018 ◽  
Author(s):  
Veejendra Yadav ◽  
Dasari L V K Prasad ◽  
Arpita Yadav ◽  
Maddali L N Rao
Keyword(s):  
Transition State ◽  
Ring Opening ◽  
Electron Process ◽  
Ring Opening Reaction ◽  
Stable Species ◽  
Electron Event

<p>The torquoselectivity of conrotatory ring opening of 3-carbomethoxycyclobutene is controlled by p<sub>C1C2</sub>→s*<sub>C3C4</sub> and s<sub>C3C4</sub>→p*<sub>CO</sub> interactions in the transition state in a 4-electron process as opposed to only s<sub>C3C4</sub>→p*<sub>CO</sub> interaction in an apparently 8-electron event in 3-carbomethoxy-1,2-benzocyclobutene. The ring opening of 3-carbomethoxy-1,2-benzocyclobutene is sufficiently endothermic. We therefore argue that the reverse ring closing reaction is faster than the forward ring opening reaction and, thus, it establishes an equilibrium between the two and subsequently allows formation of the more stable species <i>via</i> outward ring opening reaction. Application of this argument to 3-dimethylaminocarbonyl-1,2-benzocyclobutene explains the predominantly observed inward opening.</p>

Synthesis and crystal structure of [MnL(μ-Cl)MnCl3]·H2O L=N, N'-bis(2'-pyridine)methyl-1,10-phenanthroline-2,9-dimethanamine

2002 ◽  
Vol 2002 (3) ◽  
pp. 120-121
Author(s):  
Tian Fu Liu ◽  
Hua Kuan Lin ◽  
Shou Rong Zhu ◽  
Zhong Ming Wang ◽  
Hong Gen Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Synthesis And Crystal Structure
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