(a)
Interpretation:
Each of the following reactions involves a sequence of two pericyclic reactions. The intermediate X involved in each reaction, and pericyclic reactions involved are to be depicted.
Concept introduction:
Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. In phase orbital overlap results in symmetry allowed electrocyclic reactions. Selection rules of electrocyclic reactions are;
| No. of electrons | Activation mode | Stereochemistry of rotation |
| 4n | Thermal Photochemical |
Con Dis |
| 4n + 2 | Thermal Photochemical |
Dis Con |
(b)
Interpretation:
Each of the following reactions involves a sequence of two pericyclic reactions. The intermediate Y involved in each reaction, and pericyclic reactions involved are to be depicted.
Concept introduction:
Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner.
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Chapter 28 Solutions
ORGANIC CHEM +SG +SAPLING >IP<
- Indicate whether the following two statements are correct or not:- The S8 heterocycle is the origin of a family of compounds- Most of the elements that give rise to stable heterocycles belong to group d.arrow_forwardcould someone draw curly arrow mechanism for this question pleasearrow_forwardIn the phase diagram of quartz (SiO2), indicate what happens as the pressure increases.arrow_forward
- Show work. Don't give Ai generated solutionarrow_forwardNonearrow_forwardTransmitance 3. Which one of the following compounds corresponds to this IR spectrum? Point out the absorption band(s) that helped you decide. OH H3C OH H₂C CH3 H3C CH3 H3C INFRARED SPECTRUM 0.8- 0.6 0.4- 0.2 3000 2000 1000 Wavenumber (cm-1) 4. Consider this compound: H3C On the structure above, label the different types of H's as A, B, C, etc. In table form, list the labeled signals, and for each one state the number of hydrogens, their shifts, and the splitting you would observe for these hydrogens in the ¹H NMR spectrum. Label # of hydrogens splitting Shift (2)arrow_forward
Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning