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Oxidation using chromium trioxide

Oxidation of alcohol with $\ce{CrO3}$ I have come across different kinds of oxidation using ester formation (eg. Selenium/Osmium ester).This mechanism deals with the chromate ester. The structure of $\ce{CrO3}$ seems rather confusing to me: I found claims that $\ce{Cr}$ atom has any one out of the following hybridisation. $\ce{sp^2}$ (claimed by an instructor) $\ce{d^2s}$ (claimed […]