D. Zellmer et al., A FUNCTIONALIZED DIMETHYL 1,3-BUTADIENE-2,3-DICARBOXYLATE, Acta crystallographica. Section C, Crystal structure communications, 53, 1997, pp. 251-253
The crystal structure of dimethyl (1,5,5-trimethylpyrrolidin-2-ylidene
)butanedioate, C21H27NO4, has been determined in order to establish it
s constitution and configuration, and to characterize the preferred co
nformation in the solid state. There are notable differences in the co
nformations of the functional groups; the essential structural feature
s are discussed and compared.