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Date: 27-10-2019
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Date: 6-10-2020
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A ring that does not have a loop of π electrons but is not antiaromatic is said to be nonaromatic. A compound whose molecule contains one of more nonaromatic rings is called a nonaromatic compound. A ring whose π
system contains a 4n number of electrons but avoids being antiaromatic by deviating from planarity is nonaromatic. For example,
Experimentally, 3 exists in the following nonplanar conformation, known as the tub conformation, in which no two adjacent double bonds are on the same plane. Thus, there is no loop of π
electrons in the ring in 3; 3 is nonaromatic.
A ring whose π system contains 4n + 2 number of electrons, but is forced to deviate from planarity is also nonaromatic. This is why [10]annulene (10) is nonaromatic.
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