1′ ′ 3′-trimethyl-6-trifluoromethylsulfonyl-spiro(indoline-2,2′-benzo[b]pyran)
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Photochromic 1′, 3′, 3′ -trimethyl-6-trifluoromethylsulfonyl-spiro(indoline-2,2′-ben-zo[b]pyran) (1) was studied by X-ray diffraction analysis. In compound1, the Cspiro-O bond (1.49(1) Å (average)), broken on photoexcitation, is the longest of all the indoline spiropyrans studied.
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