S. Nikas et al., FORMATION AND CRYSTAL-STRUCTURE OF AN EXOCYCLIC ENOL DELTA-LACTONE OBTAINED FROM DIMEDONE AND TRIMETHYLSILYLETHYNYL PHENYLIODONIUM TRIFLATE, Journal of heterocyclic chemistry, 33(3), 1996, pp. 997-999
The reaction between dimedone anion and trimethylsilylethynyl phenylio
donium triflate leads to the formation of lpentane-1,4-diyne-3-ylidene
)-delta-valerolactone, who se crystal structure has been determined.