Exercises 1. Determine the structure of C4H8O2 with the following NMR. a) Calculate the DU. b) Assign groups based on integration. c) Put groups together based on splitting. d) Complete the rest of the steps and draw your structure. e) Does your structure match the molecular formula and chemical shifts? 3. In the NMR below, the spacing patterns of the three doublet of doublets ( A,B and C ) can be predicted using the coupling constants. Info: Common Coupling Constants J(Hz) To predict the spacing for the HA doublet of doublets: Draw pictures for HB and Hc similar to the one on the previous page for HA that show how the spacing patterns of these doublet of doublets is determined and describe the spacing of the doublets. 4. Read sections 14.12-14.13 and pages 647-648 hardcopy or pages 596-597 digital in Bruice. Recommended problems: 14.49,14.51(a,c,d,e,g,j) and 14.66