Question

If you recorded the IR spectrum of your 1-bromobutane products, interpret the spectrum as completely as you can, and use the appropriate starting material spectrum in Figure 28.1 to show that the expected functional group con-version has taken place The IR Spectrum of 1-bromobutane Reproduced from The All MICRONS 8 es % TEREST % > % % *O2>-- Fit BOERE % % % 4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 1200 1000 1800 1600 1400 WAVENUMBERS

Answer 1

The C-H stretching around 2900 cm^-1 can be observed in the product(1-Bromo butane) and the reactant(1- butanol). The absence of the broad band around 3300 cm^-1 in the product IR spectrum indicates the removal of the -OH group. Also, the C-Br stretching vibrations appear in the product from 690-515 cm^-1.

Note: 1-Butanol and 2-Butanol give identical IR spectrum and it is difficult to distinguish between the two using IR only.