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<p><span style="font-size: medium;">Epoxidation and catechol oxidation catalytic processes promoted by manganese(III) complexes of salen-type ligands</span></p>

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Title Statement <p><span style="font-size: medium;">Epoxidation and catechol oxidation catalytic processes promoted by manganese(III) complexes of salen-type ligands</span></p>
 
Added Entry - Uncontrolled Name Guha, Averi ; Surendranath Evening College
Chandra, Arpita ; Chittaranjan National Cancer Institute
 
Uncontrolled Index Term Bio-inorganic chemistry
Mononuclear Manganese(III) complexes, Catecholase activity, Epoxidation catalayst
 
Summary, etc. Four new mononuclear manganese(III) complexes namely <strong>1</strong>, <strong>2</strong>,<strong> 3 </strong>and <strong>4 </strong>of salen-type ligands H<sub>2</sub>L<sup>1</sup>-H<sub>2</sub>L<sup>4</sup> (ligands were obtained <em>in situ</em> via Schiff-base condensation of  2-formyl-6-hydroxymethyl-4-methylphenol and amines cyclohexane-1,2-diamine, 2-methylpropane-1,2-diamine, propane-1,2-diamine and ethane-1,2-diamine respectively) have been synthesised and characterised by routine physicochemical techniques. <strong>1</strong> is further characterised by X-Ray single crystal structure analysis. Catalytic efficiencies of the complexes as epoxidation catalysts (substrates: styrene and (<em>E</em>)-stilbene; terminal oxidants: PhIO/NaOCl; solvent: MeCN /dicholorometane) and as catalysts for oxidation of catachol (substrates: 3,5-di-<em>tert</em>-butylcatechol (3,5-DTBC); solvent: methanol) have been evaluated. In both cases the catalytic efficiency increases on going from <strong>4-1</strong> although the actual mechanisms in those two catalytic reactions are completely different. However, the observations have been rationalized on the basis of steric and electronic factors exerted by the alkyl substituents present on the imine back-bone of the salen-type ligands. This study also verifies that there is at least another active epoxidizing species, [Cl–O–Mn(III)(salen)X] in addition to the discrete  Mn(V)=O(salen) species in epoxidation of olefins depending upon the terminal oxidants employed.
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section A (IJCA)
2021-02-25 16:31:05
 
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http://op.niscair.res.in/index.php/IJCA/article/view/41671
 
Data Source Entry Indian Journal of Chemistry -Section A (IJCA); ##issue.vol## 60, ##issue.no## 2 (2021): INDIAN JOURNAL OF CHEMISTRY- SECTION A
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCA/article/download/41671/465531343
http://op.niscair.res.in/index.php/IJCA/article/download/41671/465531345
http://op.niscair.res.in/index.php/IJCA/article/download/41671/465531351
http://op.niscair.res.in/index.php/IJCA/article/download/41671/465531352
 
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