There is a Compound called A with the formula C13H20N2O2. In the proton NMR two triplets at 2.8 and 4.3 are coupled to each other. Similarly, a triplet at 1.1 and a quartet at 2.6 are coupled to each other. the carbonyl group appearing at 1669 cm -1 in the IR spectrum has an unusually low value. Please provide the structure of A.

Which compound will give a broad and intense band at 3100 cm-¹ in its IR spectra? (a) Pentane (c) Pentanol Pentanone Propyl ethanoate

4 A) The NMR of virstatin ethyl ester shows a deshielded triplet around 4.3 ppm and a deshielded quartet around 4.15 ppm. On the section of virstatin ethyl ester shown below UNAMBIGUOUSLY show which hydrogens in the molecule are giving rise to the deshielded quartet. (The deshielded triplet is from the CH2 group attached to the nitrogen). w - yya m rial I vietstia athy ter [ppm) 4B) 4.a (ppm) The above section of an NMR was taken from a student sample of this experiment. You see while the 2H triplet is still present at around 4.3 ppm, the 2H quartet is gone, replaced by a 3H singlet. As well a 3H triplet at 1.4 ppm also is missing from the NMR. Looking at the procedure for purifying virstatin ethyl ester you see that the ethyl ester is boiled in methanol. It appears that transesterification may occur in this process, resulting in virstatin methyl ester. In light of this statement explain the 3H singlet shown above and the missing 3H triplet. You may draw structures to help in your…

Loudon | Parise SEVENTH EDITION presented by Macmillan Learning Propose a structure for an amine of formula C,H,N, which liberates a gas when treated with NaNO, and HCl. The 13C NMR spectrum is given, with attached protons in parentheses. 13C NMR: 8 14 (2), 8 34.3 (2), 8 50.0 (1)