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212Lec5Sp09NMR4 - Group Question#2 4 pts for attendance(a...

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Group Question #2 (a) Predict the number of signals for the following compound. (b) Label the different Hs. (c) Then, determine the splitting pattern and approximate ppm value/range for each signal. Signal Splitting pattern ppm value __a____ __ triplet____ __~ 1 ppm__ __ b __ __ quartet _____ _ 2-3 __ __ c __ __ singlet ____ _ 6.5-8 _ ________ signals 4 pts for attendance O H 2 C CH 2 O H H H H H 3 C CH 3 a a b b c c c c 2 lines of symmetry! 3 Results are on their way…check at Friday’s lecture.
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Today’s agenda… Splitting examples Integration (13.10) 13 C NMR (13.4, 13.5) Last time… Splitting (13.11) J Values (13.11) Group Questions #2 Lecture 5 Lecture Problem 1 is due on Monday! Posted on ANGEL on Thursday, 1/22; download & print!
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In-Class Example/Question: For each compound below, determine the following, (a) Number of signals; then label them (a, b, c, etc) (b) The splitting patterns for each signal O H Br
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Integration measures the area underneath a signal. Get relative ratio of Hs in molecule. Get actual ratio of Hs in molecule (if have MF). 1. Measure the length of the integral with a ruler 2. Establish a relative ratio of protons (divide each length by the lowest
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