Two convenient new syntheses of ferrocenoyl chloride by triphosgene

Two convenient new syntheses of ferrocenoyl chloride by triphosgene were re ported. Firstly, ferrocenoyl chloride was conveniently prepared in 61.5% yi eld when triphosgene was reacted with ferrocene carboxylic acid in methylen e dichloride at room temperature in the presence of triethylamine and DMAP. This new method for the synthesis of ferrocenoyl chloride enjoys a number of advantages in that the reaction is carried out under mild conditions and is cleaner without the formation of POCl3, H3PO3 or SO2 and dark-colored i mpurities. Secondly, ferrocene underwent reaction with one-third equivalent of triphosgene to give ferrocenoyl chloride in 38.1% yield. The main advan tage of the second method for the synthesis of ferrocenoyl chloride is usin g cheap ferrocene as starting material. (C) 2000 Elsevier Science S.A. All rights reserved.