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Out of benzene naphtahlene anthracene, and phenantrene, which is more reactive in the Diels - Alder reaction? |
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Answer» Solution :(i) Antrancene is more REACTIVE in the DIES- Alder reaction (see Illustration `11.10). ii. Benzene does not undergo Diels-Alder reaction because its armonic ring is very stable (high `R.E. = 150.4 kJ mol^(-1)`) (iiI) Naphtalene does not reacts at orinary conditions but can react at very high pressure. It resists losing resonance energy. iv. Phenanthere does not react like benzen. If central ring of phenanthere reacts is LOST . If phenanthrene ACTS as dienophile at `(C^(() = C^(10))` double bonds, then teh aromaticity of the TWO rings is lost `:.` Reactivity order is: Anthrancene gt napthalene gt benzene = phenanthere. |
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