Question

Question 4 (a) Use molecular orbital theory to rationalize why 2π+2π cycloaddition can proceed photochemically and not thermally. [3 marks] (b) Suggest how the following compounds can be made from the starting material shown o details. the right hand side as o ne of the precursors. Give mechanistic он [6 +8+8 marks]

Answer 1

a) The Solution is shown below:

2万叶25. Here we cmsilars the Feemtiar ano tacular orbital -1 2 stale L-0 CIT) mardeof rically uua puralla UndIT Pんtrh chauuucal C.mdi Hon am d other , İw···如cited .the atて妅

qound state) +t o M 0 14 No LUMO CI ) HOMO 计0Mb an ‘ de lok, interaction, bending So, tt、 'Ph叶。.he Tni cally alla td ed

b) (iii)

Nao Poc e-tler CH CH