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HO. Но caffeic acid a. One of the alkene protons is unusually downfield with a chemical shift of 7.45 ppm. Determine which of these protons the signal belongs to and explain why you assigned it this way. b. The carbonyl stretch for caffeic acid is unusually low for a carboxylic acid at 1646 cm'. For reference, the carbonyl stretch for propanoic acid is 1716 cm. Explain why the carbonyl stretch occurs at a lower wavenumber for caffeic acid. HO. propanoic acid

HO. Но caffeic acid a. One of the alkene protons is unusually downfield with a chemical shift of 7.45 ppm. Determine which of these protons the signal belongs to and explain why you assigned it this way. b. The carbonyl stretch for caffeic acid is unusually low for a carboxylic acid at 1646 cm'. For reference, the carbonyl stretch for propanoic acid is 1716 cm. Explain why the carbonyl stretch occurs at a lower wavenumber for caffeic acid. HO. propanoic acid

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1a and 1b
Post-lab Questions 1. Keeping with the theme of autumn, one of Dr. Danahy's favorite molecules is caffeic acid due to its presence in pumpkins. This structure serves as an antioxidant and is one of many found within pumpkins. Despite its name, it bears no resemblance to caffeine. Answer the following questions about caffeic acid. HO. HỌ OH caffeic acid a. One of the alkene protons is unusually downfield with a chemical shift of 7.45 ppm. Determine which of these protons the signal belongs to and explain why you assigned it this way. b. The carbonyl stretch for caffeic acid is unusually low for a carboxylic acid at 1646 cm'. For reference, the carbonyl stretch for propanoic acid is 1716 cm. Explain why the carbonyl stretch occurs at a lower wavenumber for caffeic acid. HO. propanoic acid
Transcribed Image Text:Post-lab Questions 1. Keeping with the theme of autumn, one of Dr. Danahy's favorite molecules is caffeic acid due to its presence in pumpkins. This structure serves as an antioxidant and is one of many found within pumpkins. Despite its name, it bears no resemblance to caffeine. Answer the following questions about caffeic acid. HO. HỌ OH caffeic acid a. One of the alkene protons is unusually downfield with a chemical shift of 7.45 ppm. Determine which of these protons the signal belongs to and explain why you assigned it this way. b. The carbonyl stretch for caffeic acid is unusually low for a carboxylic acid at 1646 cm'. For reference, the carbonyl stretch for propanoic acid is 1716 cm. Explain why the carbonyl stretch occurs at a lower wavenumber for caffeic acid. HO. propanoic acid
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