ChemInform Abstract: 2,2′‐Bifurylidene‐5,5′‐diones, Coumarins, 3a,7a‐Dihydro‐1H‐inden‐1‐ones, and 5H‐Furo(3,2‐b)pyran‐5‐ones from Propyne and Carbon Monoxide.

Abstract

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).