The structure of roemrefine
ConclusionsStructure (1) has been established for roemrefine on the basis of a study of the products of its Hofmann degradation, oxidation, and spectral characteristics.
THE ALKALOIDS OF PAPAVERACEOUS PLANTS: LIV. THE STRUCTURE OF ESCHSCHOLTZINE
Eschscholtzine, a new alkaloid from Eschscholtzia californica, has been shown to be the bismethylenedioxy analogue of N-methylpavine (argemonine). The mass spectrometric fragmentation of alkaloids of the pavine type is discussed.
Optical rotatory dispersion and absolute configuration—III
Abstract Optical rotatory dispersion measurements on pyrrolidine, piperidine, and tetrahydro-isoquinoline alkaloids indicate that the absolute configuration of the α-asymmetric center may be assigned directly from the dispersion curve, provided either that the nitrogen atom is not protonated, or that the compound contains a chromophore absorbing above 200 mμ.