The crystal structure of coclaurine hydrobromide monohydrate and the absolute configuration of coclaurine.
Abstract The structure and absolute configuration of coclaurine has been determined by X-ray analysis of its hydrobromide monohydrate. The (+)-enantiomer has the D-configuration. The chirality of the molecular structure is correlated with circular dichroism measurements.
Sterical correlation of (+)-armepavine and (+)-laudanidine
Abstract (+)-O-Methylarmepavine and (+)-laudanidine have been sterically correlated through their preparation from a common optically active intermediate. It follows that the asymmetric carbon atom in natural (−)-armepavine has the R configuration.
The Far Ultraviolet Absorption Spectra of Simple Alkyl Amines
A quantitative study of the absorption spectra of ammonia, the three methyl and the three ethyl amines, has been made in the region 39 000 to 63 000 cm−1. Three electronic transitions have been observed in most cases. The first is of low intensity particularly in the secondary amines, the second is of higher intensity and increases from the primary to the tertiary compound, and the third, which is only partially covered by these measurements, is of intermediate intensity. The positions of all transitions, particularly the second, are influenced by alkyl substitution. These transitions are discussed in relation to the spectrum of ammonia. Vibrational structure, present in ethyl amine, methyl amine, and dimethyl amine, has been analyzed in part.