212Lec3Fa09NMR2

212Lec3Fa09NMR2 - Group Questions #1 Results 1. Based on...

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Group Questions #1 Results… 1. Based on the 1 H NMR spectrum of ethanol, do “upfield signals” appear at lower ppm values or higher ppm values? (1 pt) lower higher (circle one) 100% of groups, correct 2. Looking over the 1 H NMR spectra of ethanol, would you say that protons that get closer to an electronegative atom, like oxygen, will have a higher ppm value? (1 pt) Yes No (circle one) 98.6% of groups, correct 3 . Referring to the 1 H NMR spectrum of p -methoxybenzaldehyde, do you consider protons attached to an aromatic ring (benzene) to be deshielded? (1 pt) Yes No (circle one) 100% of groups, correct 4. The ppm value for a specific nucleus’ signal depends on the nucleus’ chemical environment within the molecule. (1 pt) True False (circle one) 100% of groups, correct 4 pts for attendance
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Today’s agenda… Chemical Shift (13.3, 13.9) Proton Equivalency (13.8) Last time… How NMR Works Chemical Shift Group Question #1 Lecture 3
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1 H NMR spectrum of ethanol… ppm C H 3 C H 2 O H TMS Three signals - three different types of H’s a a b b c c Downfield; Nuclei are more deshielded. Upfield; Nuclei are more
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212Lec3Fa09NMR2 - Group Questions #1 Results 1. Based on...

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