The [Co,(CO),]-catalyzed reaction between propyne and CO in acetone at 110" and 170 bar was reinvestigated. There are five major products: (E)-3,4'-dimethyl-2,2'-bifurylidene-S,S'-dione (4), 3,5,8-trimethylcoumarin
The reaction of (I) with (II) is reinvestigated yielding a complex product mixture which contains five major components: the known product (III) as well as (IV) and (Va)‐(VIIa) (X‐ray analysis of (VIa): space group C2/c with Z = 8, and of (VIIa): P21/c with Z=4).
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