Analyze each of the following cycloaddition reactions and answer the accompanying questions. Analyze each of the…
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Question “Analyze each of the following cycloaddition reactions and answer the accompanying questions. Analyze each of the…”
Analyze each of the following cycloaddition reactions and answer
the accompanying questions.
Analyze each of the following cycloaddition reactions and answer the accompanying questions. Which statements are true? This reaction is thermally forbidden. This reaction is photochemically forbidden. This reaction is photochemically allowed. This reaction is thermally allowed. This reaction is thermally allowed. This reaction is photochemically forbidden. This reaction is photochemically allowed. This reaction is thermally forbidden.
Answer
The HOMO and LUMO of an alkene that contains sigle bonds are as follows: LUMO HMO Alkenes undergo excitation in the presence of light, and the HOMO is modified. LUMO (exited), hv HMO Now, the overlap of the lobes occurs to produce a [2+2] cycleoaddition reaction among the given alkenes. Photochemically permitted reaction.
The HOMO and the LUMO for 1,3-butadiene are as follows: LUMO HMO The HOMO in 1,3-butadiene may overlap with the LUMO from an alkyne, alkene, or other alkyne. HOMO (1,3-butadiene) LUMO (alkyne) The [4+2] cyclo-addition does not take place under photochemical conditions because the overlap of exited HMO and LUMO can be difficult. Exited HOMO (1,3-butadiene) LUMO (alkyne) Photochemical C Thermal The reaction is thermally permitted The reaction that is prohibited by Photochemistry
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