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- W2074092972 abstract "The syntheses of 1,1‘,3,3‘,6,6‘,8,8‘-octachloro-9,9‘-bifluorenylidene (1), its precursors, and the byproduct 3,3‘,5,5‘-tetrachloro-4-(trichloromethyl)biphenyl (5) are described. Accurate structural X-ray data on 1 and on perchloro-9,9‘-bifluorenylidene (2) are reported and discussed. Because of chlorine overcrowding, the dihedral angles between their two identical fluorenylidene moieties are abnormally large, the central-ethylene twist angles being 55 and 66°, respectively. Significant out-of-plane carbon−chlorine bond bending is likewise exhibited. Their ESR spectra and magnetic measurements prove that they are singlet species. The exceptionally large bathochromic displacements of their UV−vis absorption spectrum with respect to that of their parent hydrocarbon are mainly attributed to bond bending and molecular warping." @default.
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- W2074092972 date "2002-03-29" @default.
- W2074092972 modified "2023-10-11" @default.
- W2074092972 title "1,1‘,3,3‘,6,6‘,8,8‘-Octachloro-9,9‘-bifluorenylidene and Perchloro-9,9‘-bifluorenylidene, Two Exceedingly Twisted Ethylenes" @default.
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- W2074092972 doi "https://doi.org/10.1021/jo010979m" @default.
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