Question

5. To which of the following molecules does the spectrum below belong? Explain your choice carefully! (4 pts) I strongly suggest you draw each molecule. Cis-3-hexene, (z-1-ethoxy-1-butene 2-ethyl-1-butene, Cl Cl doublet iplet or JH 109 Cl Ci Explain why the resonance at ö 3.7 is so complex (this is a tough one) Draw out the molecule you selected and consider the relationships among hydrogens (4 pts)

Answer 1

The moleculeis Ca 2 t 2 23 dublet 560ppm

The peak at 3.7 ppm is due to 4 Hs of two CH₂ groups. They are diastereotopic to each other. Thats why each proton is splitted to multiplet and the signals combine with each other to give a complex pattern.