Question

Why carbonyl group in aromatic aldehyde and ketone is metadirecting and deactivating group

Answer 1

if a carbonyl group situated on a benzene ring specially aldehyde or ketone group withdrawn the electron from benzene ring. As a result the ortho and para position of the benzene of electron density is decreased. then the aeromatic ring is deactivated. in this time the electron density of the meta position is comparatively higher than the ortho and para position of the benzene. in the time some other groups enters in meta position by any reaction. In this reason carbonyl group in aeromatic aldehyde and ketone id metadirecting and deactivating group.

Answer 2

the bayer villiger oxidation is the oxidative cleavage of a carbon carbon bond adjacent to a carbonyl which converts ketones to esters and cyclic ketones to lectons.