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1

There exist different approaches to synthesize cyclohexanol and/or cyclohexanone from cyclohexane. One method is to use O2 and Vanadium oxides at 400°C and 15 atmospheres. Another method is to oxidize with H2O2 at 80°C with a catalyzer made from Silica gel treated by a silicone derivates holding an amino drop at the end of the alkyl chain fixed on Si. The so ...


2

The Lemieux-Johnson oxidation (details here) using catalytic $\ce{OsO4}$ or $\ce{RuO4}$ turned over with $\ce{NaIO4}$ will do the transformation you want in one step. These conditions should be selective for the exo double bond.


0

To confirm, you want to make (R)-4-acetyl-1-methylcyclohex-1-ene? Do you have to start from (S)-limonene? If not, consider the Diels-Alder reaction of isoprene and methyl vinyl ketone (e.g. https://doi.org/10.1039/B701333G , though this is not an enantioselective synthesis I imagine you can add chiral auxiliaries somewhere to increase that selectivity)


2

If you use about equimolar amounts of zinc and the acid, the reaction would about asymptotically converge to depletion of the substance with the lower molar amount. The white precipitate is a mark the solution is saturated with zinc sulphate heptahydrate. The solution becoming thickened by the suphate may further decrease the rate of zinc dissolution. You ...


4

I think you're being a little too strict with your definition of what a synthesis reaction is. A better way to describe it might be building more complex molecules from simpler ones. Wouldn't you say $\ce{C6H12O6}$ is more complex than $\ce{CO2}$ and $\ce{H2O}$?


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