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The second family of reagents are ''salts'', featuring the pyridinium cation (C<sub>5</sub>H<sub>5</sub>NH<sup>+</sup>).
*[[pyridinium dichromate]] (PDC) is the pyridium salt of dichromate, [Cr<sub>2</sub>O<sub>7</sub>]<sup>2-</sup>.
*[[pyridinium chlorochromate]] (PCC) is the pyridinium salt of [CrO<sub>3</sub>Cl]<sup>
These salts are less reactive, more easily handled, and more selective than Collins reagent in oxidations of alcohols. These reagents, as well as other, more exotic adducts of nitrogen heterocycles with chromium(VI), facilitate a number of oxidative transformations of organic compounds, including cyclization to form [[tetrahydrofuran]] derivatives and allylic transposition to afford enones from [[allyl]]ic alcohols.
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*Poos, G. I.; Arth, G. E.; Beyler, R. E.; Sarrett, L. H. ''J. Am. Chem. Soc.'', '''1953''', ''75'', 422.
*{{cite journal | title = Improved Procedure for Oxidations with the Chromium Trioxide-Pyridine Complex| author = Ronald Ratcliffe and Ronald Rodehorst | journal = [[J. Org. Chem.]] | year = 1970 | volume = 35 | issue = 11 | pages = 4000–4001 | doi = 10.1021/jo00836a108}}
==References==
{{reflist|30em}}
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