The tabulated 1H NMR and 13C NMR spectral data acquired for an unknown compound with an atomic composition of C11H20O2
is detailed below. Using this data, propose a molecular structure for the unknown compound and, based on this structure, hypothesise a molecular structure of at least one major fragment appearing in the corresponding EI mass spectrum of the unknown compound, which is shown below;
1H NMR (500 MHz, Chloroform-d) δ 5.55 (s, 1H), 5.11 (d, J = 5.8 Hz, 1H), 4.16 (q, J = 6.3 Hz, 2H), 2.22 (d, J = 6.1 Hz, 2H), 2.18 (d, J = 6.1 Hz, 2H), 2.13 (s, 3H), 1.65 (s, 3H), 1.61 (s, 3H), 1.27 (t, J = 6.3 Hz, 3H).
13C NMR (125 MHz, Common NMR Solvents) δ 166.72 (C), 158.99 (C), 131.99 (C), 123.58 (CH), 116.45 (CH), 59.71 (CH2), 38.94 (CH2), 26.53 (CH2), 24.98 (CH3), 19.87 (CH3), 18.90 (CH3), 14.53 (CH3).
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