Home > Organic Chemistry > Molecules to NMR

How many NMR signals does #CH_3CH_2OCH_2CH_3# show?

Answer 1

The H NMR spectrum of diethyl ether shows two signals.

The molecule has a plane of symmetry, so the two CH₃ groups are equivalent, and the two CH₂ groups are equivalent.

We should see two signals with area ratios 6:4 or 3:2.

The electronegative O atom pulls all signals downfield. The effect decreases rapidly with distance.

We should expect the CH₂ groups to be pulled about 2 ppm downfield from their normal value of δ 1.4. They should give a 4H signal at about δ 3.4.

We should expect the CH₃ groups to be pulled about 0.3 ppm downfield from their normal value of δ 0.9. They should give a 6H signal at about δ 1.2.

The signals will be split by spin-spin coupling.

Here is a spectrum of diethyl ether.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Ava Andrews

CH3CH2OCH2CH3 shows four NMR signals.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.