Question

What 1H coupling patterns (singlets, doublets, triplets,etc) would you expect from the following compounds?

`C_1-CH_2-CH_2-CH_2-C_1`
`(CH_3)_2-CH-CO-CH_3`

Answer 1

For the alkyl chain, I would expect a mess. For the carbonyl, a doublet (6H), a septet (1H), and a singlet (3H).

Explanation:

For your `C_1CH_2CH_2CH_2C_1` fragment I don't know. Are the `C_1's` the same?

For `(H_3C)_2CHC(=O)CH_3`, we would first integrate the spectrum, and get a `6:1:3` integrand ratio, a doublet, a septet, and singlet.