C-C ---- 1.5424-0.006 A.; C--O = 1.2434-0.004 A; C-lq = 1.315-4-0-004 A . When the present work on oxamide was commenced, the only published report dealing with X-ray work on this substance was by Misch & van der Wijk (1938), and owing to the unusual C-C bond length reported by these authors it was decided to carry out a complete re-investigation of the structure using two- and three-dimensional methods; when our final refinement of the structure was approaching completion, a preliminary report of a further structural investigation was published by Romers (1953). We have employed three-dimensional Fourier and differential syntheses methods, and the results remove the anomaly of the C-C bond length reported by Misch & van der Wijk, but the general features of the structures previously reported are confirmed. The crystals were grown from water solution at approximately 70 ° C., and appeared as radiating clusters or interlacing nets of laths and needles, elongated along [a]; the identity of this material with the common microcrystalline powder form of oxamide was demonstrated by means of X-ray powder photographs in a 19 cm. camera. The lattice parameters of the triclinic cell used in this work are:
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Ayerst et al. (1954) studied this question.