DAT OChem

[ohopenyoureyes]

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For Orgo, did you guys memorize the IR frequencies for each functional group and the NMR shifts? Is it important to do so? Just starting to study so I"m not quite sure.

 

[virtualmaster999]

I don't think you have to memorize them necessarily. Once you do enough problems, you start to remember where all the peaks are at. If anything, there aren't that many, so you could memorize them if its giving you some trouble.

 

[goldcrown17]

If you know a few of the basics and then a few patterns, you should be able to figure it out from there.
I memorized that -OH is going to be broad around 3000, C=O is going to be strong around 1700, the patterns for an aromatic ring around 1500, and C=C bonds around 1600.

Then a few of the patterns. Ie- what happens when you go from single -> double -> triple bonds. Why some bonds vibrate higher than others.

I'm still studying, but from the IR questions i've seen, even in destroyer, if you can see -OH, C=C, C=O, and double vs. triple bonds, you should be fine.

 

[DAT Destroyer]

For Orgo, did you guys memorize the IR frequencies for each functional group and the NMR shifts? Is it important to do so? Just starting to study so I"m not quite sure.

Yes....it is important to know some key IR and NMR numbers for the DAT......For example......In the NMR.....aromatic hydrogens come in around 7 ppm.....aldehydes at around 9ppm......acid hydrogens come in around 13 ppm. In IR....bands like 1720 for carbonyls.....1650 for alkenes,,,,,,2200 for triple bonded compounds like alkynes and nitriles......3300 for alcohols...usually BROAD....while 3300 for groups like NH2.....which are sharp.

Hope this helps. Keep hammering away !!!

Dr. Romano

 

[matardug]

Definitely memorize the important ones.