Question

Provide a structure for the compound with molecular formula C9H12 and with the following spectroscopic data.1H NMR: 1.2δ (doublet, I=6H), 3.0δ (septet, I=1H), 7.1δ (multiplet, I=5H)

Answer 1

The structure analysis says the compound must be Cumene or isopropylbenzene

Step-by-step explanation:

Degree of unsaturation or double bond equivalent

D.B.E =
`C-(H)/(2)+(N)/(2)+1`

=
`9-(12)/(2)+(0)/(2)+1`

= 4

¹H NMR data analysis

(i) 1.2δ (doublet, I = 6H) two CH₃ are equivalents and the multiplicity says the neighboring carbon have one hydrogen.

(ii) 3.0δ (septet, I = 1H), one CH and the multiplicity says the neighboring carbon have six hydrogens.

(iii) 7.1δ (multiplet, I = 5H) , means

and the sturcture of the compound is