
%0 Journal Article
%A Arnold, DP 
%A Nitschinsk, LJ 
%A Kennard, CHL 
%A Smith, G 
%T Preparation of Some Pyrrole-3,4-dicarboxylic Acid Derivatives and the Crystal Structure of 2-Methylpyrrolo[3,4-c]pyrrole-1,3(2H,5H)-dione
%J Australian Journal of Chemistry
%D 1991/02/01
%V 44
%N 2
%P 323-330
%K 
%R https://doi.org/10.1071/CH9910323
%U https://www.publish.csiro.au/paper/CH9910323 
%X A series of pyrrole-3,4-dicarboxylic acid derivatives has been prepared, and the crystal structure of one, 2-methylpyrrolo[3,4-c]pyrrole-1,3(2H,5H)- dione, has been determined by X-ray diffraction and refined to a residual R 0.049 for 1415 observed reflections. Crystals are monoclinic, space group P21/c, with Z= 8 in a cell of dimensions a 14.775(3), b 7.0692(5), c 15.151(3)&#506;, &#946; 118.82(8)°. Strain in the planar fused ring system is evident from the widening of the external interring angles to 143&#176;, and from the unusual substituent effects in the 13C n.m.r. spectra. 
