I. W. Bassi, R. Scordamaglia
Jul 1, 1977
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Journal
Macromolecular Chemistry and Physics
Abstract
The molecular and crystal structure of 1,4-bis(chloroacetyl)-trans-2,5-dimethylpiperazine synthesized by us, was determined from X-ray diffractometer data. The structure was solved by Patterson and Fourier methods and refined by least-squares techniques to R 0,065 for 1081 independent reflections. The crystals are monoclinic, space group P21/n, with Z = 2 in a unit cell of dimensions: a = 9,486 (6), b = 9,139 (6), c = 7,036 (5) A, β = 95,73 (10)°, the numbers in parentheses being the estimated standard deviations refering to the last significant digit. The trans-2,5-dimethylpiperazine ring is in a flattened-chair conformation with the side methyl groups in axial position. The atoms of the amide are nearly coplanar. It seems to be proved that the structure of the trans-2,5-dimethylpiperazine ring in poly(trans-2,5-dimethyl-1,4-piperazinediylfumaroyl) is similar to that found for 1,4-bis(chloroacetyl)-trans-2,5-dimethylpiperazine.