212Lec9Sp09Prob

212Lec9Sp09Prob - downfield c If DEPT info is given...

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Today’s agenda… Spectral Problems Last time… UV/Vis Spectroscopy (14.7 - 14.9) Exam 1: Spectroscopy & Nomenclature Wed, 2/11 8:15 to 10:15 pm A-H: 105 Forum I-Q: 111 Forum R-Z: 112 Kern Conflict Exam: Wed, 2/11 4:00 to 6:00 pm 101 Osmond Sign up with Mike in 210 W Disability Exam: Sign up with Mike in 210W Lecture 9
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Suggested steps to solve spectral unknown problems . 1. Determine HDI if MF is given. (If not given, then use mass spec data). 2. Evaluate the IR spectrum’s functional group region. Use correlation chart. 3. Evaluate the 1 H NMR: a. Count the # of signals = # of different types of H’s b. Look at the ppm values; use correlation chart. Start by looking downfield (ArH, CHO, CO 2 H) c. Look at splitting patterns pieces of the molecule; J values d. Consider the integration. If integration is greater than 3 for a signal, must be symmetry 4. Evaluate the 13 C NMR spectrum: a. Count the # of signals = # of different types of C’s b. Look at the ppm values; use correlation chart. Start by looking
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Unformatted text preview: downfield c. If DEPT info is given, determine the different type of carbons 13 C NMR Correlation Chart 1 H NMR Correlation Chart 5.0 0.0 1.0 2.0 3.0 4.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 Chemical Shift, δ (ppm) CO 2 H C H O Ar H , CON H 2 C=C H X-C H O-C H C C H O-H N-H COC H C H , C H 2 C H 3 IR Correlation Chart IR Correlation Chart Correlation of Bond Stretching and IR Absorption (See also Correlation Chart & Table in Lab Guide) Type of Bond Group Family of Compounds Wavenumber Range (cm-1 ) Single Bonds —C—H Alkanes 2850-3300 =C—H Alkenes, aromatics 3000-3100 ≡ C—H Alkynes 3300-3320 O—H Alcohols 3200-3600 N—H Amines 3300-3500 C—O Ethers, Esters, Alcohols Carboxylic Acids 1330-1000 Double Bonds C=C Alkenes, aromatics 1600-1680 C=O Carbonyls 1680-1750 Aldehydes, ketones 1710-1750 Carboxylic acids 1700-1725 Esters, amides 1680-1750 C=N Imines 1500-1650 Triple Bonds C ≡ C Alkynes 2100-2200 C ≡ N Nitriles 2200-2300...
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212Lec9Sp09Prob - downfield c If DEPT info is given...

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