How would you interpret this unknown? 17 19 16 ST 10 2 23 13 12 21 1000 600 3000

Question

How would you interpret this unknown? 17 19 16 ST 10 2 23 13 12 21 1000 600 3000 Wavenumber (om-11 l Result of Peak Picking 1 Position ltesty Position Intensity No. Position Intensity No. Position itesty 1 725.104 59.2547 3756.923 90 9552 4 909 272 7.10245 1634.406 6522172 5 993.16 24 627 1051.98 84.3077 7 11108 86.0979 8 1172.51 893403 1298 82 83.5693 10 1378.85 49.0712 11 141549 60.9657 12 1465.63 188979 13 164209 22.9858 14 1701.87 74.4347 15 1732.73 85.7971 16 18224 88.0974 17 197764 108.286 18 2300 44 107 852 19 2668 03 98.0774 20 2731.67 94 2832 21 2856.06 7.42848 22 292741 621031 23 30788 31.113

Explanation / Answer

1) Peak 23: 3078.8 cm-1 sharp intense peak indicates vinylic/aromatic /cyclopropane C-H stretch. (sp2 C-H stretches)

2) Peak 21 and 22 : 2927.41 and 2856.06 cm-1 indicate sp3 C-H stretches.

3) Peak 13 : Sharp and intense peak at 1642.09 cm-1 indicate strongly conjugated C=O i.e. with extensive conjugation. Or Ph ring also suspected.

4) Peak 12 : sharp and strong 1465.63 cm-1 indicate C=C stretches.

5) Peak 5 and 4 : 993.466 and 909.272 cm-1 this doublet indicate monosubstituted C=C bond.

Hence the the interpretatively important peaks.

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