
%0 Journal Article
%A Byrne, LT 
%A Cannon, JR 
%A Gawad, DH 
%A Joshi, BS 
%A Skelton, BW 
%A Toia, RFWAH 
%T The crystal structure of (S)-(&#8211;)-6-Bromo-5,7-dihydroxy-8-methyl-2-phenyl-2,3-dihydro-4H-1-benzopyran-4-one [(&#8211;)-6-bromocryptostrobin] and a <sup>13</sup>C N.M.R. study of (&#177;)-cryptostrobin and related substances. Revision of the structures of the natural products (&#177;)-lawinal, unonal, 7-O-methylunonal and isounonal
%J Australian Journal of Chemistry
%D 1982/09/01
%V 35
%N 9
%P 1851-1858
%K 
%R https://doi.org/10.1071/CH9821851
%U https://www.publish.csiro.au/paper/CH9821851 
%X The crystal structure of (S)-(-)-6-bromo-5,7-dihydroxy-8-methyl-2-phenyl-2,3-dihydro-4H-1-benzopyran-4-one [(&#8211;)-6-bromocryptostrobin] (11) has been determined by X-ray diffraction from diffractometer data at 295 K and refined by block diagonal least squares to a residual of 0.050 (810 'observed' reflections). Crystals of (11) are tetragonal, P43212, a 7.849(4), c 46.83(2) Å, Z 8. The crystallographic data are consistent with the S configuration previously proposed for (&#8211;)-cryptostrobin (10). The 13C n.m.r, spectra of (±)-cryptostrobin and(±)-strobopinin also lead to the structures (1) and (6), respectively. This work has enabled the structures proposed for the natural products (±)-lawinal, unonal, 7-O-methylunonal and isounonal to be revised to (8), (14), (15) and (12), respectively. 
