Erich Singer

Extremely reactive carbon-carbon double bonds-I: Reactions with 2-(9-xanthylidene)-, 2-(9-thioxanthylidene)-, and 2-(9-fluorenylidene)-indane-1, 3-dione. a contribution on the structure and reactivity of non-planar C-C double bonds

Abstract The compounds in the title (cf 1a, 1b and 2) react with various reagents, often under mild conditions, mostly by breaking of the central double bond According to X-ray diffraction the central double bond of 2 - (9 -xanthylidene) indane - 1, 3 - dione is inclined by 47.2°. The relationship between the structure and reactivity of the compounds in the title is discussed.