Ir, nmr, mr help..?

I'm not completely sure how to draw the compund by just looking at IR, NMR, MR. My professor is not really good at lecturing.. you know.. one of "those" reading off the powerpoint lecturing. so I'm trying to learn by myself by reading book but I can't figure it out. I know how to find bonds ketones aromatics but not sure how to put all together to draw a compound. please anyone help!!

Answer:
You got an aromatic? write it down. If there are 5 aromatic hydrogens, make one valence. If there are four make two valences on your aromatic.

You got a ketone? write it down with two open valences.
Keep going till you got all the fragments as far as you can tell.

Your job is to put them together like tinkertoys without introducing connections that are inconsistent with the data (for example if you put a CH2 next to your ketone, the chemical shift of that CH2 will be 2.1 ppm or so).

The MS (not MR) is useful for getting the molecular weight and formula so that you can determine the number of unsaturations. These should be consistent with what you see in the IR (carbonyls) and NMR (aromatics, vinylics). Also MS can tell you whether you have a Cl or Br real easy because of the isotope pattern on the molecular ion.

The answers post by the user, for information only, FunQA.com does not guarantee the right.



More Questions and Answers:
  • Which is more efficient single or multiple liquid-liquid extraction?
  • What is the chemical name for Gunpowder? (not the equation, just the name)?
  • How does xanthoproteic test differ from the heller ring test?
  • How do you write equations for these?
  • What are the uses of latent heat ?
  • Who discovered that circumcision should be done?
  • Baking Soda Chemistry Question?
  • Which of the following is true of all multi-step reactions?
  • How do you freeze a glass of water to the tabletop?