-CHLORO-6-DIMETHYLAMINO-3,5-PYRIDINEDICARBALDEHYDE

The title compound, C9H9ClN2O2, contains a rather distorted pyridine r ing (planar to within +/- 0.07 Angstrom) with four substituents. The O atoms of the formyl groups at C4 and C2 are displaced from the plane of the pyridine ring by ca 1.1 and 0.3 A, respectively. The dimethylam ino group at C5, which is planar to within 0.04 degrees, forms a dihed ral angle of 23.8(1)degrees with the plane of the pyridine ring. The C 4-C5 bond in the pyridine ring [1.444 (2) Angstrom] is much longer tha n normal in pyridines [1.379 Angstrom], while N1-C1 [1.304(2) Angstrom ] is shorter and N1-C5 [1.357 (2) A] is longer than normal [1.337 Angs trom; Alien, Kennard, Watson, Brammer, Orpen and Taylor (1989). J. Che m. Sec. Perkin Trans. 2, pp. S1-S19]. The C5-N(dimethylamino) bond [1. 332 (2) Angstrom] is shorter than expected.