69200-16-4Relevant articles and documents
COMPOUND, COMPOSITION AND ORGANIC LIGHT-EMITTING DEVICE
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Page/Page column 26; 27, (2017/09/15)
A compound of formula (I) or (III) (Formulae (I), (III)) wherein: one Y is a substituent R1 bound directly to the fluorene unit of formula (I) by an sp3-hybridised carbon atom; the other Y is an aryl or heteroaryl group Ar1 that may be unsubstituted or substituted with one or more substituents; Ar2 is an arylene or heteroarylene group; R2 is a substituent; b is 0, 1, 2, 3 or 4; c is 0, 1, 2 or 3; and X is a group of formula (II): (Formula (II)) wherein Z is O or S; R3 independently in each occurrence is a substituent; each x is independently 0, 1, 2 or 3; and * is a bond to the fluorene unit of formula (I).The compounds may be used as host materials for phosphorescent dopants in organic light-emitting devices.
General and practical carboxyl-group-directed remote C-H oxygenation reactions of arenes
Wang, Yang,Gulevich, Anton V.,Gevorgyan, Vladimir
, p. 15836 - 15840 (2014/04/03)
Two methods for remote aromatic C-H oxygenation reactions, have been developed. Method1, the Cu-catalyzed oxygenation reaction, is highly efficient for cyclization of electron-neutral and electron-rich biaryl carboxylic acids into 3,4-benzocoumarins. Method2, the K2S2O 8-mediated oxygenation reaction, is more general and practical for cyclization of substrates with electron-donating and -withdrawing groups (see scheme). Copyright
Cu(I)-mediated lactone formation in subcritical water: A benign synthesis of benzopyranones and urolithins A-C
Nealmongkol, Prattya,Tangdenpaisal, Kassrin,Sitthimonchai, Somkid,Ruchirawat, Somsak,Thasana, Nopporn
, p. 9277 - 9283 (2013/10/01)
Benzopyranones were successfully synthesized using Cu(I)-mediated C-O bond formation in subcritical water. A number of benzopyranone derivatives including polymethoxy benzopyranones, benzopyranopyridones, chromenoindolones, and furochromenones were synthesized in satisfactory yield. This methodology was further applied to synthesize the intestinal microbial metabolites, urolithins A, B, and C, which were found to exhibit potent antioxidant activity.
Tri-, tetra- and pentamers of 9,9'-spirobifluorenes through full ortho -linkage: High triplet-energy pure hydrocarbon host for blue phosphorescent emitter
Fan, Cong,Chen, Yonghua,Gan, Pei,Yang, Chuluo,Zhong, Cheng,Qin, Jingui,Ma, Dongge
supporting information; experimental part, p. 5648 - 5651 (2011/03/20)
4,4'-Dibromo-9,9'-spirobifluorene was first synthesized, and from this intermediate, three fully ortho-linked tri-, tetra-, and pentamers of 9,9'-spirobifluorenes were constructed. The full ortho-linkage impedes the π conjugation of fluorene units, and guarantees their high triplet energies (ET = 2.80 eV). A device with the trimer as the first pure hydrocarbon host material for blue phosphor FIrpic shows a maximum current efficiency of 25 cd/A.
Achieving conformational control over C-C, C-N and C-O bonds in biaryls, N,N′-diarylureas and diaryl ethers: Advantages of a relay axis
Betson, Mark S.,Bracegirdle, Ann,Clayden, Jonathan,Helliwell, Madeleine,Lund, Andrew,Pickworth, Mark,Snape, Timothy J.,Worrall, Christopher P.
, p. 754 - 756 (2007/10/03)
The orientation of Ar-C, Ar-N and Ar-O bonds in biaryls, N,N′-diarylureas and diaryl ethers (whose conformers are distinguishable by NMR) may be controlled with a selectivity up to >95: 5 by an adjacent stereogenic centre; the selectivity may be greater when a second stereogenic axis is inserted between the controlling centre and the slowly rotating bond. The Royal Society of Chemistry.
Copper(I)-mediated and microwave-assisted Caryl-O carboxylic coupling: Synthesis of benzopyranones and isolamellarin alkaloids
Thasana, Nopporn,Worayuthakarn, Rattana,Kradanrat, Phithakpong,Hohn, Elliot,Young, Lauren,Ruchirawat, Somsak
, p. 9379 - 9382 (2008/03/13)
(Chemical Equation Presented) A simple and highly effective C-O carboxylic coupling reaction catalyzed by copper(I) salts has been developed to synthesize benzopyranones. The reaction of various 2-halobiarylcarboxylic acids was examined using m
Contribution to the study of the mechanism of directed remote-metalation. Evidence for the intermediacy of a geminal dimetallo dialkoxide C(OM) 2 (M = Li, K), first doubly charged director of ortho metalation
Tilly, David,Samanta, Subhendu S.,De, Asish,Castanet, Anne-Sophie,Mortier, Jacques
, p. 827 - 830 (2007/10/03)
(Chemical Equation Presented) The mechanism of the metalation of 2-biphenyl carboxylic acid (1) with the Lochmann-Schlosser superbase was determined by deuteriolysis. Both ortho (C3) and remote (C2′) positions are metalated. The C2-metalated species 2 cyclizes instantaneously. Under suitable conditions, the doubly charged geminal dimetallo dialkoxide group C(OM)2 4 directs metalation in the adjacent position (C1), affording a stable 1-metallo-9H-fluorene-9,9-dimetallo dialkoxide 5 that can be trapped by diverse electrophiles to give 1-substituted 9H-fluoren-9-ones 7 and 9 after acidic workup.
The Fragment Ion C13H9O2 m/z 197 in the Mass Spectra of 2-(2'-R-phenyl)benzoic Acids
Gillis, Richard G.,Porter, Quentin N.
, p. 203 - 207 (2007/10/02)
In the electron impact mass spectrum of 2-(2'-R-phenyl)benzoic acids where R = H, NO2, OCH3, COOH, or Br, an abundant fragment ion m/z 197 is formed by an ipso substitution in which R is expelled as a radical.The structure of the ion m/z 197 has been shown by collision-activated dissociation to be identical with that of the protonated molecule formed by methane chemical ionization of 6H-dibenzopyran-6-one.
