1. Formation and Identification of cis- and trans-Dihydroxyimidazolidinones from Ureas and Glyoxal
2. Imidazoimidazoles. I. The Reaction of Ureas With Glyoxal. Tetrahydroimidazo[4,5-d]imidazole-2,5-diones1,2
3. W. Baker and F. B. Field, J. Chem. Soc., 88 (1932) and references therein.
4. Melting points are uncorrected. Glyoxal used was 40% “pure” grade supplied by Dr. F. Jonas Co. N.m.r. spectra were obtained on a Varian A-60A spectrometer calibrated with tetramethylsilane as an internal standard. Infrared spectra were obtained in KBr discs using a Perkin-Elmer model 21 spectrophotometer. Use of a company or product name by the Department does not imply approval or recommendation of the product to the exclusion of others which may also be suitable.