
TY  - JOUR
A1  - Cooke, RG 
A1  - Liu, A 
A1  - Raston, CL 
A1  - White, AH 
T1  - Colouring matters of Australian plants. XXII. Ventilagone: crystal structure and an approach to synthesis
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1980
VL  - 33
IS  - 2
SP  - 303
EP  - 311
KW  - 
UR  - https://doi.org/10.1071/CH9800303 
N2  - The crystal structure of the title compound, a naturally occurring tricyclic quinone, C16H16O5, has been found to be (1R*,3S*)-7,10- dihydroxy-1,3,8-trimethyl-3,4,6,9-tetrahydro-1H-naphtho[2,3-c]-pyran- 6,9-dione by single-crystal X-ray diffraction methods at 295(1) K and refined by least squares to a residual of 0.033 for 1143 'observed' reflections. Crystals are monoclinic, P21, a 8.346(8), b 16.79(2), c 4.911(5)&#506;, &#946; 101.17(8)&#176;, Z 2. The molecule is shown to have the cis configuration. As an approach to the synthesis of the pigment the model compound 5-chloro-8-methoxy-1,3-dimethylisochroman has been prepared and the two racemic forms have been separated and characterized. 
ER  -

