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Introduction to Organic Chemistry

by: Jordy Rice

Introduction to Organic Chemistry CHM 122

Marketplace > Wake Forest University > Chemistry > CHM 122 > Introduction to Organic Chemistry
Jordy Rice
GPA 3.97

Marcus Wright

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Marcus Wright
Class Notes
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This 1 page Class Notes was uploaded by Jordy Rice on Wednesday October 28, 2015. The Class Notes belongs to CHM 122 at Wake Forest University taught by Marcus Wright in Fall. Since its upload, it has received 48 views. For similar materials see /class/230748/chm-122-wake-forest-university in Chemistry at Wake Forest University.

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Date Created: 10/28/15
Important IR Absorbance Frequencies Vibration 1 Wavenumber cm Major Peaks 7 veg important sp CH stretch spZ CH stretch 29602850 lt3000 3100 3020 gt3000 C frequency depends on type of carbonyl and whether or not it is conjugated strong sharp peak 718501630 often 7 1725 OH typically very broad strong peak 36503400 Carboxylic acid OH centers 73000 aromatic overtones a few weak absorbance peaks that occur in a group 20001600 Minor Peaks 7 less important but still helpful in determining structures sp CH stretch 33333267 NH often appear as multiple bands 7 more sharp than an OH 34003250 CC triple bond or CN triple bond almost nothing else absorbs in this range 722602100 CH of aldehyde usually a small peak just to the right of the other CH stretches 28302695 CO 11501050 CC weaker intensity peak as compared to CO 16801620 Helpful how to hints for interpreting IR spectra Look for evidence of major functional groups 1 Is a CO present 2 If a CO is present check for complementary absorbances to help determine what type of carbonyl compound you have For instance carboxylic acid would also have an OH Amides may have a N H Esters would have a CO Anhydrides have 2 peaks in the carbonyl region 1810 cm391 and 1760 cm39l Aldehydes have weak absorbances near 2850 and 2750 Ketones are the only carbonyl functional group left 3 If there isn t a CO do you see evidence of alcoholsphenols amines ethers 4 See any aromatic peaks or CC evidence Check for aromatic overtones and sp2 CH stretches 5 Is there a triple bond Note the helpful hints are not my own Introduction to y A Guide for Students in Organic Chemist Pavia Lampman and Kriz Saunders College Publishing 1979


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