Explain why the two methyl groups have different NMR chemical shifts. What is th

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Explain why the two methyl groups have different NMR chemical shifts. What is the term applied to protons such as these?

Explain why the two methyl groups have different NMR chemical shifts. What is the term applied to protons such as these? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help enantiotopic achiral chiral In the starting aldehyde, the two methyl groups are equivalent. In the product of the Grignard reaction, however, a new center is created, and the two methyl groups are no longer equivalent. As the Newman projection demonstrates, rotating the back carbon cannot ever put the two methyls into identical environments. This is reflected in the NMR as separate signals with different chemical shifts. These methyl groups are called diastereotopic

Explanation / Answer

1. In the starting aldehyde the two methyl groups are equivalent. In the prodcut of the grignard reaction, however a CHIRAL center is created and the two methyl groups are no longer equivalent.

2.as the newman projection demonstrates, rotating back carbon cannot ever put the methyls into identical environments.this is reflected in nmr as separate signals .These methyl groups are called DIASTEREOTOPIC.

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