21. The carbonyl group is probed using typically hydrazide-or alkoxy amine-functionalized dyes or other compounds. 22. Binding, for instance to the carbonyl group of acetaldehyde, varies with the wine in question. 23. The formation of a carbonyl group makes this reaction, unlike other sigmatropic rearrangements, inherently irreversible. 24. Typical electrophiles are the carbon atom of carbonyl groups , carbocations or sulfur or nitronium cations. 25. Thus, they all contain a hydroxyl group placed on the ?-position of a carbonyl group . 26. Thioacetals and thioketals can also be used to protect a carbonyl group in organic syntheses. 27. Dakin reaction "') is an carbonyl group is oxidized, and the hydrogen peroxide is reduced. 28. The carbonyl group can undergo the usual reactions ( hydrogenation, reductive amination, etc . ). 29. Benzylic C-H bonds are oxidatively converted to carbonyl groups : 30. In the Johnson Corey Chaykovsky reaction epoxides are generated from carbonyl groups and sulfonium ylides.
