[mangolite2]

What is the difference in the reactivity of cyclohexanone and TBS protected hydroxy acetone as  a Michael Donor?

I think the TBS protected hydroxyacetone is more sterically demanding than the planar cyclohexanone. The enamine which is formed may have steric effect which may hinder the attack on the electrophile?

For nitrostyrene as Michael Acceptors: Have I assigned these derivatives correctly :

Electron-donating groups: R = OMe, 1-napthalene,  2-napthalene

Electron-withdrawing groups : R = 4-NO₂, 3-NO2, 4- Br