Glyoxylic Acid → 5,7-Bis(1,1-dimethylethyl)-3-(4-methylphenyl)-2(3H)-benzofuranone

Participants

Reaction Steps

A mixture of 21.2 g (0.10 mol) of 2,4-di-tert-butylphenol (97%), 16.3 g (0.11 mol) of 50% aqueous glyoxylic acid, 2.0 g of Fulcat 22B and 50 ml of toluene is refluxed for 8 hours under nitrogen on a water separator. The Fulcat 22B catalyst is then removed by filtration and excess toluene is distilled off on a vacuum rotary evaporator. Crystallisation of the residue from 40 ml of ethanol yields 14.2 g (42%) of 5,7-di-tert-butyl-3-(4-methylphenyl)-3H-benzofuran-2-one, m.p. 130-133° C. (compound (104), Table 1).

Provenance & Evidence