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Synthesis and Circular Dichroism of Cholestenopyrimidines
Author(s) -
Hajós GyöRgy,
Snatzke Günther
Publication year - 1989
Publication title -
liebigs annalen der chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0170-2041
DOI - 10.1002/jlac.198919890107
Subject(s) - circular dichroism , chemistry , cotton effect , stereochemistry , wavelength , spectral line , crystallography , optics , physics , astronomy
The syntheses of two new ([2,3‐ d ]‐ and [3,2‐ d ]‐fused) 2‐cholestenopyrimidines 2 and 5 are described. In their CD spectra, four Cotton effects can be observed, and they have been assigned to an n – π * (B 1 ), π – π * (B 2 ), and to two n – π * (A 2 ) transitions, respectively, from long to short wavelengths. The first two Cotton effects are positive for compounds 2a and 2b , but negative for 5 ; the third CD is negative, the fourth one positive for all isomers. The methyl group of 2b is of no influence upon the CD.