Redox Switching of Conjugation Length Using 9,9,10,10-Tetraaryl-9,10-dihydrophenanthrene as an ON/OFF Unit: Preparation, X-ray Structure, and Redox Properties of Perfluorobiphenyl Derivative and Its SNAr Reactions to π-Extended Analogues
Polycyclic fluoroaromatic compounds. Part V. Nucleophilic replacement in decafluorophenanthrene
作者:J. Burdon、B. L. Kane、J. C. Tatlow
DOI:10.1039/j39710001601
日期:——
Decafluorophenanthrene reacts with sodium methoxide and with dimethylamine with replacement of the fluorine atoms at positions 2 and 7. This has been proved by n.m.r. spectroscopy and by chemical means. Polyfluorophenanthrenes are oxidised to polyfluorobiphenyl-2,2′-dicarboxylic acids by potassium permanganate.
The preparations and reactions of several 2,2′-disubstitutedoctafluorobiphenyls and heterocyclic organometallic derivatives of Group IV elements and titanium are described. Some evidence is given for the organometallic titanium intermediate postulated in the coupling reaction for the syntheses of polyfluorobiphenyls.
Fluorocarbanion chemistry. Octafluorofluorene and companions
作者:Robert Filler、August E. Fiebig、M. Yavuz Pelister
DOI:10.1021/jo01295a025
日期:1980.3
FILLER R.; FIEBIG A. E.; PELISTER M. Y., J. ORG. CHEM., 1980, 45, NO 7, 1290-1295
作者:FILLER R.、 FIEBIG A. E.、 PELISTER M. Y.
DOI:——
日期:——
Redox Switching of Conjugation Length Using 9,9,10,10-Tetraaryl-9,10-dihydrophenanthrene as an ON/OFF Unit: Preparation, X-ray Structure, and Redox Properties of Perfluorobiphenyl Derivative and Its S<sub>N</sub>Ar Reactions to π-Extended Analogues
Octafluorobiphenyl-2,2′-diylbis(diarylmethylium) dye 2a2+ prepared from 1,2-dibromotetrafluorobenzene is interconvertible with colorless dihydrophenanthrene donor 1a. By the SNAr reactions of 1a with acetylides, π-extended analogues 1b and 1c were obtained. Their electrochromic behavior is accompanied by a drastic absorption change not only in the visible but also UV region, because the torsion angle of the biaryl unit is modified upon redox reactions.