Crystal structures of the homologues diethyl and dimethyl (10 H-indeno-[1,2- b]quinoxalin-11-yl)phospho-nate: use of non-spherical scattering factors
{{output}}
The two title compounds, 4a C19H19N2O3P and 4b C17H15N2O3P, are not isotypic. The tetra-cyclic ring systems are essentially planar. The phospho-nate groups are similarly oriented. Compound 4a crystallizes in P1 with Z' = 1; mol-ecules are linked in inversion-... ...
