696-01-5Relevant articles and documents
Fluoro-substituted and 13C-labeled styrylbenzene derivatives for detecting brain amyloid plaques
Sato, Kumi,Higuchi, Makoto,Iwata, Nobuhisa,Saido, Takaomi C.,Sasamoto, Kazumi
, p. 573 - 578 (2007/10/03)
Two styrylbenzene derivatives, (E,E)-1-fluoro-2,5-bis-(3-hydroxycarbonyl-4- hydroxy)styrylbenzene (FSB) and (E,E)-1-bromo-2,5-bis(3-hydroxycarbonyl-4- hydroxy)styrylbenzene-α,α′-13C2 ([ 13C]BSB), were synthesized for use as a histochemical stain to detect amyloid plaques of Alzheimer's disease (AD) brain sections. An analysis of fluorescence spectra demonstrated that FSB shows approximately twofold fluorescence intensity relative to the conventional styrylbenzene derivative, (E,E)-1-bromo-2,5-bis-(3-hydroxycarbonyl-4-hydroxy)styrylbenzene (BSB). Moreover, FSB was found to stain amyloid plaques and neurofibrillary tangles of AD brains with greater fluorescence intensity and a lower level of background signals compared to BSB. These finding indicate that FSB can be an excellent fluorescent compound to label human amyloid lesions with high sensitivity and specificity. Because of the possession of a nuclide with a quantized angular momentum, both FSB and [13C]BSB are also potential contrast agents for magnetic resonance imaging to locate AD pathologies in vivo.
Novel process for generating useful electrophiles from common anions using Selectfluor fluorination agent
Syvret, Robert G.,Butt, Kathleen M.,Nguyen, Tung P.,Bulleck, Victoria L.,Rieth, Ryan D.
, p. 4487 - 4493 (2007/10/03)
In the present work, the electrophile equivalents C1+, Br+, SCN+, and NO2+ are generated from their respective sodium, potassium, and in some cases ammonium salts (M+X-) by reaction with Selectfluor electrophilic fluorination agent in acetonitrile solution at room temperature. These generated electrophilic species subsequently react in situ with a variety of aromatic substrates containing one or more substituent groups including H, F, C1, CH3, COOH, C(O)CH3, NO2, and OR′ and NR′R″ where R′ and R″ are H or CH3. The resulting substitution products are, in most cases, isolable as pure compounds in high yield. Variations in the process include the use of other anions, electrophilic fluorination agents, and solvents.
Preparation process of fluorine substituted aromatic compound
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, (2008/06/13)
A preparation process of a fluorine substituted aromatic compound comprising reacting an alkali metal or alkali earth metal salt of an aromatic compound having a hydroxy group with an organic fluorinating agent is disclosed. As a representative fluorinating agent, a bis-dialkylamino-difluoromethane compound, for example, 2,2′-difluoro-1,3-dimethylimidazolidine, is exemplified. According to the process, an industrially useful fluorinated aromatic compound, for example, a fluorobenzene, a fluorine substituted benzophenone, a fluorine substituted diarylsulfone can be prepared with ease in economy without specific equipment.
