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Chromium irioxide

Pyridinium chlorochromate (PCC), CsHsN-HChCrOj, mp 205 C (dec), which is commercially available, is prepared by adding chromium irioxide to a solution of pyridine in hydrochloric acid [603]. The preparation i.s easier than that of the chromium trioxide-pyridine complex. [Pg.23]

Other methods for the preparation of 6.99 from leucine involved reduction of the acid moiety with borane and then oxidation to an aldehyde with chromium irioxide and pyridine. Another variation added zinc bromide to the enolate condensation reaction,75 which led to greater selectivity for the anti diastereomer. [Pg.207]

Preparation by saponification of 2-(benzoyloxy)-6-bromo-5-methoxy-4-nitrobenzophenone (SM) with potassium hydroxide in ethanol (71%). SM was obtained by oxidation of 4-bromo-5-methoxy-6-nitro-2,3-diphenylbenzofuran with chromium Irioxide in boiling acetic acid for 30 min [571]. Also obtained by hydrolysis of 6-bromo-5-methoxy-4-nitro-2-(4-nitrobenzoy-loxy)benzophenone [571], m.p. 126° [571] Spectra (NA). [Pg.63]

Chromimn Irioxide (Chromic anhydride chromic acid chromium(VI) oxide chromic trioxide chromium oxide)... [Pg.286]

See other pages where Chromium irioxide is mentioned: [Pg.292]    [Pg.553]    [Pg.292]    [Pg.553]    [Pg.557]    [Pg.456]   
See also in sourсe #XX -- [ Pg.66 , Pg.79 ]



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