Pd. Robinson et al., 9-(1-acetoxyethylidene)fluorene('diacetylfluorene'), a by-product from theacetylation of 9-fluorenyllithium, ACT CRYST C, 57, 2001, pp. 428-430
Treatment of 9-fluorenyllithium with acetyl chloride produces 9-acetylfluor
ene, (I), and several by-products, among which is `diacetylfluorene', now c
haracterized definitively as 9-(1-acetoxyethylidene)fluorene [IUPAC name: (
1-fluoren-9-ylidene)ethyl acetate], (II), C17H14O2, derived from acetylatio
n of initially formed (I). Various parameters disclose substantial structur
al distortion within (II) emanating from A ((1,3)) strain associated with t
he 9-(acetoxyethylidenyl)fluorene system.