[Rutherford]

As no problem of the week anymore, I thought of posting a problem on my own, so we practice a bit for our competitions . I know the solution and anyone who wants may attempt it. We could also make it this way: the one who answers a problem correctly may post the next problem.

Deduce the structure of an organic compound which has the following spectra:

[Corribus]

As no problem of the week anymore,

Yeah, what is up with that, anyway?

[Rutherford]

Borek stopped with that because of low activity. I think that it rose now. Will see.

[discodermolide]

How about:

[Rutherford]

Good job. I will explain a bit:
From the mass spectra, M=86g/mol and we can deduce the -CH₃ and -C₃H₇, -C and -O fragments. This is in agreement with the C-NMR spectrum. The shift of the C atom above 200ppm means that one C atom is connected to oxygen. From H-NMR it can be seen that the -C₃H₇ group is isopropyl. Using the rest of the information from H-NMR one will end up with 3-methyl-2-butanone.

May you now post another problem you want in a new topic, so we others try to solve it?

[Borek]

Borek stopped with that because of low activity.

Yep. But I have nothing against some new interesting problems.