• keto
  • In addition, chromone (a derivative of benzopyran with a substituted keto group on the pyran ring), dinorxanthane sesquiterpene, and other substances isolated from T. (thefreedictionary.com)
  • 19 ] employ the microwave radiation in the synthesis of benzopyrans from substituted acetophenones and keto compounds mediated by Triton-B under solvent-free conditions and mild condition in one pot reaction given excellent yield. (springer.com)