Module I Oxidation Reactions - NPTel
Module I Oxidation Reactions - NPTel
Module I Oxidation Reactions - NPTel
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NPTEL – Chemistry – Reagents and Organic reactions<br />
1.3.9 <strong>Oxidation</strong> of Aromatic Ring<br />
Chromium based reagents are extensively used for the partial oxidation of cyclic<br />
hydrocarbons to the quinones (Scheme 14).<br />
CH 3<br />
CrO 3<br />
AcOH<br />
CrO 3<br />
AcOH<br />
1.3.10 Asymmetric Epoxidation<br />
Scheme 14<br />
Joint initiative of IITs and IISc – Funded by MHRD Page 34 of 122<br />
O<br />
O<br />
Menadione<br />
O<br />
CH 3<br />
O<br />
Anthraquinone<br />
Chiral chromium(VI)-salen complex has been studied for asymmetric epoxidation<br />
of trans alkenes (Scheme 15). The reaction works in both catalytic and<br />
stoichiometric mode but the stoichiometric mode works slightly well than catalytic<br />
mode.<br />
Ph<br />
Me<br />
Catalyst,<br />
PhIO<br />
MeCN, 0 C Ph<br />
O<br />
Me<br />
Scheme 15<br />
CF 3<br />
N O<br />
Cr<br />
N<br />
O L O<br />
Catalyst<br />
L = Ph 3PO<br />
F 3C<br />
NO 3
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