2-acylfuran derivatives
(R: alkyl, phenyl, etc.; R1: H, alkyl) are prepared in high yield by reaction, in the presence of a boron trifluoride complex catalyst, of a furan compound
with
CHXY (X: H, Cl, Br; Y: Cl, Br) or with RCOOH in the presence of (XYCHCO)20.