Index of hydrogen deficiency (IHD) → # of missing H's in structure:
where n = number of carbons and H is:
• +1 for hydrogen (H) or halogens (X)
• 0 for oxygen (O)
• –1 for nitrogen (N)
IHD = 1 → ring or double bond
IR spectra: 1735 cm-1→ ester (RCOOR: 1735-1750 cm-1) → double bond (C=O)
Provide a structure for the following compound:
IR: 1743 cm-1;
1H NMR spectrum:
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