Ethylene glycol as hydrogen donor for the syntheses of thymol analogues via hydrolysis of 4-methylcoumarins
摘要:
Treatment of 4-methylcoumarins with potassium hydroxide in ethylene glycol resulted in the formation of the 'normal' 2-isopropenylphenols and/or the 'abnormal' 2-isopropylphenols depending on the nature of the substrates. The solvent ethylene glycol was believed to be the hydrogen donor for double-bonding reduction where 2-isopropylphenol was produced. (C) 2012 Elsevier Ltd. All rights reserved.