Question

How to distinguish between the two members of each pair of compounds by proton NMR spectroscopy?

3. (12 points) By citing specific data, show that you could (or could not members of each pair of compounds by 'H-NMR Spectroscopy. If y significant distinguishing features, mention all of them. Give all refer question. Tato show that you could (or could not) distinguish between the two hy TH-NMR Spectroscopy. If you are aware of several bention all of them. Give all references used to answer the a) butyl 2-phenylbenzoate benzyl pentanoate b) benzyl 32-pentenoate benzyl 3E-pentenoate CH

Answer 1

D (6) The Che connected with electronegative arom ie oxygen atom and in compound 'a' will show triplet around 4 w5ppm and in compound 'b' will show singlet around 5ppm. With this chemical shaft , we can diferentate the compound. trans coupling syn coupling. This can be differentrated by the J-value of alkene. Trans coupling is more than syn couplery Hence Ivalue for compound 'a' is doublet will be more than compound's?