In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Dirhodium tetraacetate as an auxiliary chromophore in a circular dichroic study on vic-amino alcohols, published in 2005-07-18, which mentions a compound: 53636-17-2, Name is (S)-1-(Dimethylamino)propan-2-ol, Molecular C5H13NO, Category: piperazines.
The dirhodium method proposed herein, involves the in situ formation of chiral complexes of optically active vic-amino alcs. with the achiral dirhodium tetraacetate [Rh2(OAc)4] acting as an auxiliary chromophore. The resulting CD spectra are suitable for stereochem. studies, since the observed sign of Cotton effects arising within the d-d absorption bands of the metal core is determined by the chirality of the amino alc. ligand. In MeCN and CHCl3 solutions, chiral complexes are formed by axial ligation of the ligand to the metal atom(s) of the dirhodium core. This axial binding occurs through the N atom of the 1,2-amino alc. unit independently of the ligand-to-metal molar ratio, as shown from the 15N and low-temperature NMR experiments In agreement with NMR results, ESI MS experiments indicate that in solution, a mixture of chiral complexes with ligand-to-metal molar ratios 1:1 and 2:1 is present. An empirically based rule correlating the sign of Cotton effect occurring >600 nm with the stereochem. of ligand was formulated.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics