Bretherick’s has long noted that 2-Propanol will form peroxides, and the discovery is by the roto-evaporation procedure.

Ҡ1280. 2-Propanol (Isopropanol)

[67-63-0] C3H8O

Me2CHOH

(MCA SD-98, 1972); FPA H45, 1976; HCS 1980, 783

1. Renfrew, M. M., J. Chem. Educ., 1983, 60(9), A229

2. Bonafede, J. D., J. Chem. Educ., 1984, 61, 632

3. Redemann, C. E., J. Amer. Chem. Soc., 1942, 64, 3049

4. Mirafzal, G. A. et al., J. Chem. Educ., 1988, 65(9), A226–229

5. Bohanon, J. T., Chem. Eng. News, 1989, 67(1), 4

Several explosions have occurred during laboratory distillation of isopropanol

[1,2,4,5], some with a sample stored for 5 years in a part empty can [5]. No

cause was apparent, but presence of traces of ketone(s) promoting peroxidation

is a probability. Previously, the presence of 0.36 M peroxide had been reported

in a 99.5% pure sample of isopropanol stored for several months in a partially

full clear glass bottle in strong daylight [3]. The reformation of peroxides in deperoxided

isopropanol ‘within a few days’ had been noted [2]. It appears that the

tertiary H on the 2-position is susceptible to autoxidation, and that 2-propanol must

be classed as peroxidisable. 2-Hydroperoxy-2-hydroxypropane has, in fact, been

isolated from photocatalysed oxidation of isopropanol.

See PEROXIDISABLE COMPOUNDS (reference 7)

See 2-Butanone, below; also Oxygen (Gas): Alcohols

I also believe that there was a paper several years ago (sorry cannot locate) that indicated they could not find peroxides in 2-Propanol.