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The crystal structures of 3,3-diphenylbenzo[f]chromene, C25H18O, 1,3,3-triphenylbenzo[f]chromene, C31H22O, and 2,2-diphenylbenzofuro[2,3-g]chromene, C27H18O2, have been determined. Annulated 2,2-diphenylchromenes are of interest because of the influence of steric strain energy in the pyran ring on the photochromic properties of these compounds.
Supporting information
| Crystallographic Information File (CIF) Contains datablocks global, II, III, IV |
| Structure factor file (CIF format) Contains datablock II |
| Structure factor file (CIF format) Contains datablock III |
| Structure factor file (CIF format) Contains datablock IV |
CCDC references: 126979; 126980; 126981
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