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Green chemistry for schools has flitted in out of schemes of work but they are available.
For esterification and preparation of aspirin, strongly acidic ion exchange resin can be used as an example of a heterogrneious catalyst.
I doubt if any synthetic organic chemist would use sodium dichromate as an oxidising agent for oxidising alcohols and carbonyl compounds. Hydrogen peroxide is the greenest of oxidising agents with a high atom economy and can be used with a small amount of iron(II) ions present (Fenton's reagent)
You can read more about it here

Bob Worley

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