Acetyienedicarboxakhyde b& (dlethyi acetal) was prepared from acetylene gas and triethyl orthoformate by the method described by Whol (2). Melting points were determined by using a ThomasHoover Unimelt instrument and are uncut~ ected. The nuclear magnetic resonance spectra were taken on a Varian A-60 spectrometer using tetramethyisilane as an internal reference, and shifts (6) are reported in ppm.
