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Chapter 30: Q.30-12 (page 1033)

The 13C NMR spectrum of homotropilidene taken at room temperature shows only three peaks. Explain.

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The13C NMR spectrum of homotropilidene taken at room temperature shows only three peaks can be explained.

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01

Three distinct types of carbon

There is a rearrangement of homotropilidene at a rate is too fast for detection of NMR. The 13C NMR spectrum taken at the room temperature for the average of 2 equilibrating forms for the equivalent position as 1 and 5 as are position 2 and 4. There are three distinct types of carbon are visible in the spectrum of 13CNMR of homotropilidene.

02

Five peaks at the spectrum of homotropilidene

The 13C NMR spectrum of homotropilidene will show 5 peaks when rearrangement were slow. It will show only 3 peaks at room temperature due to its average of two equilibrating form of specific positions.

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