Degree of unsaturation is typically covered at the start of your organic chemistry course when you learn how to identify constitutional isomers. Yet it amazes me how many advanced orgo students still don't understand or know this concept at the Orgo 2 level.

This concept is CRITICAL for finding isomers, identifying key structures during spectroscopy, and identifying the unknown in a complex reaction roadmap when only a formula is given.

What's more confusing is the way this information is taught. A bunch of letters and numbers to calculate that appear to make little sense overall. This video will show you how to break up the complex ‘Degree of Unsaturation' formula into very simple and easy to understand components.

You will hear this referred to as:

- DOU = Degrees of Unsaturation
- IHD = Index of Hydrogen Deficiency
- DBE = Double Bond Equivalents

(Click HERE to watch this video on YouTube. Transcription coming soon)

Raj Manohar says

Hi Leah, I happened to visit your pages by accident and found that the presentations are crystal clear. I was particularly impressed by formal charge calculation treatment. I have been teaching just the same way, avoiding the complicated mathematical equation. This prompted me to see how you deal with DBE or DOU as many textbooks again provide a confusing mathematical equation. Again, we have been teaching the same way (including saying ‘remove one NH’ for every N, if present in the compound. Amazing coincidence!!!

My hearty appreciation goes for your keen understanding and lucid tutorials.

Best wishes,

Raj

Bobby says

Hey can you please make a Proton NMR video please

Eston C Clare says

I looked over the twice. I think there is a discrepancy in what you say while explaining Nitrogen (need to add a hydrogen) to your summary in your closing statements where you say that you should subtract a hydrogen for the existence of a Nitrogen. Can you clarify? It could very well be my misunderstanding. Awaiting your response. Otherwise, excellent video and logic.

Leah4sci says

Eston: BECAUSE you need to add 1 H for every Nitrogen your count will be too high and so you must SUBTRACT an H from the total number to compensate for the added N

K Reid says

Schedule a bootcamp during the week for those who work weekend nights.

Leah4sci says

Unfortunately no matter what I schedule I won’t be able to fit everyone’s needs. That’s why every bootcamp is recorded with the ability for students to experience it at any time after the fact