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- Analyze the ¹H NMR spectrum of methyl crotonate. Use the integrations, splitting patterns, and chemical shifts to assign the protons for the structure. HC H3C A -7.271 7.013 6.974 6.939 s J 1.01 7.0 5.873 5.869 -5.834 -5.830 [ HB 6.0 O 5.0 3.905 4.0 VCL C 3.07€ -3.538 CH3 D T 3.0 f1 (ppm) 006 .894 -1.891 100 3.291 2.0 .877 1.874 .872 1.0 000*0- B 0.0 © University of Michigan Answer Bank U D Aarrow_forwardWhat information can proton nuclear magnetic resonance spectroscopy (1H NMR) tell you about an unknown's structure? What information can't it give you? Give only one example for each question.arrow_forwardDeduce the structure from the nmr dataarrow_forward
- Compound CsH12 gives the following H-NMR. Draw the structure of the compound. Draw a box around the structure you want graded. 5.00 1.00 6.04 70 6.5 6.0 4.0 3.5 3.0 25 20 1.5 A student was adding bromine across the double bond of 2-butene to make 2,3-dibromobutane. After taking the NMR, the student discovered they didn't get the product expected. Based on the NMR, what product did they obtain? Draw a box around your answer. 1.00 2.01 |2.00 3.00arrow_forwardWhat would be the multiplicity associated with # 2 in 1H-NMR?arrow_forwardDescribe the 1H NMR spectrum of each compound. State how many NMR signals are present, the splitting pattern for each signal, and the approximate chemical shiftarrow_forward
- For the protons labeled Hª and Hb in the structure, predict the characteristics of their signals in the ¹H NMR spectrum: the approximate chemical shift, the splitting pattern, and the integration value. Ha a TOT a нь Нь Xarrow_forwardWhat is the structure of the compound which gives rise to this data? Explain your reasoning. NMR SPECTRUM C7H80arrow_forwardImagine that you developed a new chlorination reaction and you used isobutyraldehyde (A) as a starting material. The reaction produces one product: either B or B’. How would you distinguish these two compounds from one another using 1 H NMR or IR spectroscopy?arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning