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Line 2: ==Inventory of Cr(VI)-pyridine reagents== One family of reagents employs the complex CrO<sub>3</sub>(pyridine)<sub>2</sub>.<ref>{{cite ~~book~~journal \|doi=10.1007/0-387-25725-X_1\|~~chapter~~tiel=Chromium-based Reagents\|title=Oxidation of Alcohols to Aldehydes and Ketones\|~~series~~journal=~~Basic~~Organic Reactions ~~in Organic Synthesis~~\|year=2006\|pages=1–95\|isbn=0-387-23607-4}}</ref> [[Sarett oxidation\|Sarett's reagent]]: a solution of CrO<sub>3</sub>(pyridine)<sub>2</sub> in pyridine. It was popularized for selective oxidation of primary and secondary alcohols to carbonyl compounds. [[Collins reagent]] is a solution of the same CrO<sub>3</sub>(pyridine)<sub>2</sub> but in dichloromethane. The Ratcliffe variant of Collins reagent relates to details of the preparation of this solution, i.e., the addition of chromium trioxide to a solution of pyridine in methylene chloride.<ref name=JCC>{{cite journal \| author = J. C. Collins, W.W. Hess \| title = Aldehydes from Primary Alcohols by Oxidation with Chromium Trioxide: Heptanal \| volume = 52 \| pages = 5 \| doi = 10.15227/orgsyn.052.0005 \| year = 1972}}</ref>

Oxidation with chromium(VI) complexes: Difference between revisions