Question

Difference between primary orbital interaction and secondary orbital interaction

Answer 1

Explanation:

In [Co(NH3)6]3+ Co is in +3 state and has configuration 3d6. In the presence of NH3, 3d electrons pair up leaving two d-orbitals empty. Hence, the hybridization is d2sp3 forming and inner orbital complex. ... The hybridization is sp3d2 forming an outer orbital complex.

Answer 2

A secondary orbital interaction do approach is often the preferred approach because of secondary orbital interactions between the C=O lobes and the back lobes of the diene HOMO. No bonds are formed from these interactions, but it is suggested that the transition state energy is lowered.

primary orbital interaction in a transition state of a normal Deils-Alder occur between highest occupied molecular orbital. It is also called Deils-Alder orbital interaction