- Further studies of fluoride ion entrapment in octasilsesquioxane cages; X-ray crystal structure studies and factors that affect their formation
-
A range of fluoride-encapsulated octasilsesquioxane cage compounds have been prepared using the TBAF route. Our studies suggest that whilst it is relatively straightforward to prepare fluoride-encapsulated octasilsesquioxane cage compounds with adjacent sp2 carbons, leading to a range of aryl and vinyl substituted compounds, the corresponding sp3 carbon derivatives are more capricious, requiring an electron withdrawing group that can stabilize the cage whilst not acting as a leaving group. Analysis by X-ray crystallography and solution 19F/29Si NMR spectroscopy of R8T8@F- reveal very similar environments for the encapsulated fluoride octasilsesquioxane cages. Migration of a fluoride ion from inside the cage to outside the cage without breaking the T8 framework and the possibility of encapsulating other anions within silsesquioxane cages have been also investigated.
- Taylor, Peter G.,Bassindale, Alan R.,El Aziz, Youssef,Pourny, Manuel,Stevenson, Richard,Hursthouse, Michael B.,Coles, Simon J.
-
-
Read Online
- Synthesis and structural characterization of functionalized cyclotetrasiloxane rings [4-RC6H4Si(O)OR′]4 (R = Cl, Br, CH{double bond, long}CH2, CH2Cl; R′ = Na, SiMe3) as scaffolds for the sy
-
A series of sodium arylcyclotetrasiloxanolates properly functionalized in the para position of the aromatic ring, like [4-RC6H4Si(O)ONa]4 and the corresponding (trimethylsiloxy)cyclotetrasiloxanes [4-RC6H4
- Ronchi,Pizzotti,Orbelli Biroli,Macchi,Lucenti,Zucchi
-
-
Read Online
- Synthesis of Nanostructured Organosilicon Luminophores Based on Phenyloxazoles
-
A series of nanostructured organosilicon luminophores (NOLs) composed of a central 1,4-bis(5-phenyl-1,3-oxazol-2-yl)benzene (POPOP) acceptor chromophore and various peripheral p-terphenyl and 2,5-diphenyl-1,3-oxazole donor fragments have been synthesized for the first time using van Leusen reaction and direct palladium-catalyzed C-arylation of oxazole ring. Due to different functionalities of the silicon branching centers, NOLs with different donor-acceptor ratios have been obtained. The synthesized structures are expected to possess good optical characteristics for use in photonics and optoelectronics.
- Skorotetcky,Borshchev,Cherkaev,Ponomarenko
-
-
- A novel highly efficient nanostructured organosilicon luminophore with unusually fast photoluminescence
-
Synthesis and theoretical and experimental investigations of a novel nanostructured organosilicon luminophore (NOL) containing six 2,2′-bithienyl donor units connected via silicon atoms to a 1,4-bis(5-phenylthienyl-2-yl)-benzene acceptor unit with efficie
- Starikova,Surin,Borshchev,Pisarev,Svidchenko,Fedorov,Ponomarenko
-
p. 4699 - 4708
(2016/06/09)
-
- Synthesis of azobenzene substituted tripod-shaped bi(p-phenylene)s. Adsorption on gold and CdS quantum-dots surfaces
-
We report here the synthesis of several tripod-shaped oligo(p-phenylene)s with legs composed of two phenylene units. Each leg is end-capped with a thioacetate group for adhesion to metallic surfaces. An azobenzene chromophore group is present on the functional arm of the tripod. The key step in the synthesis is the Pd-catalyzed Suzuki cross-coupling reaction of the silicon derivative core molecule with substituted phenyl moieties and azobenzene derivatives. Gold surfaces prepared by thermal evaporation and CdS quantum-dots surfaces were covered by the tripod-shaped molecules. Modified surfaces were characterized by atomic force microscopy (AFM), fluorescence, and Kelvin Probe analyses.
- Hierrezuelo, Jesús,Rico, Rodrigo,Valpuesta, María,Díaz, Amelia,López-Romero, J. Manuel,Rutkis, Martins,Kreigberga, Jana,Kampars, Valdis,Algarra, Manuel
-
p. 3465 - 3474
(2013/04/24)
-
- Meerwein's reagent mediated, significantly enhanced nucleophilic fluorination on alkoxysilanes
-
We developed a new facile method to fluorosilanes from alkoxysilanes using Meerwein's reagent. Our protocol afforded fluorosilanes in excellent yields in various organic solvents including acetonitrile under mild reaction conditions at room temperature. We also proposed a reaction mechanism with the probable silyloxonium intermediates. Georg Thieme Verlag Stuttgart · New York.
- Jorapur, Yogesh R.,Shimada, Toyoshi
-
supporting information; experimental part
p. 1064 - 1068
(2012/06/17)
-
- Silver-mediated fluorination of aryl silanes
-
A regiospecific silver-mediated fluorination of aryl silanes is reported. The reaction is operationally simple, and employs Ag2O as readily available, inexpensive silver source, which can be recovered.
- Tang, Pingping,Ritter, Tobias
-
supporting information; experimental part
p. 4449 - 4454
(2011/08/03)
-
- FLUORINATION OF ORGANIC COMPOUNDS
-
Methods for fluorinating organic compounds are described herein.
- -
-
Page/Page column 98; 99
(2010/07/10)
-
- Organosilane compound and organosilica obtained therefrom
-
Provided is an organosilane compound expressed by the following general formula (1): where: Ar represents a divalent aromatic organic group, such as a phenylene group; R1 represents a hydrogen atom or the like; R2 to R6, which may be the same or different from each other, each represent a hydrogen atom or the like; and X represents a reactive substituent, such as a halogen atom.
- -
-
-
- Organosilane compound and organosilica obtained therefrom
-
Provided is an organosilane compound expressed by any one of the following general formulae (1) to (7): (wherein: Ar represents a phenylene group or the like; R1 represents a hydrogen atom or the like; R2 to R8 each represent a methyl group or the like; n represents an integer in a range from 0 to 2; m represents an integer of 1 or 2; L represents a single bond or the like; X represents a hydrogen atom or the like; and Y represents a hydrogen atom or the like).
- -
-
Page/Page column 19-20
(2008/12/07)
-
- Preparation of functionalized aryl(diallyl)ethoxysilanes and their palladium-catalyzed coupling reactions giving sol-gel precursors
-
A series of molecular building blocks containing allylsilyl groups, which can be incorporated into the appropriate sol-gel precursors as fragments, were prepared. The allylsilyl group is retained unchanged over the course of all reactions giving sol-gel precursors and behave as the synthetic equivalent of alkoxysilyl groups toward sol-gel polymerization, but are stable enough to allow purification by silica gel chromatography. These allylsilanes were successfully used as building blocks to construct functional sol-gel precursors via palladium-catalyzed coupling reactions.
- Maegawa, Yoshifumi,Nagano, Toyohiro,Yabuno, Tatsuya,Nakagawa, Hiroki,Shimada, Toyoshi
-
p. 11467 - 11474
(2008/03/12)
-
- Compound for optical materials and methods of fabrication
-
A polycyclic or monocyclic perfluorovinyl compound comprising at least one structural unit selected from the group consisting of formula I and formula II wherein M is independently at each occurrence a metal selected from group 14 of the periodic table of
- -
-
-
- Improved synthesis of aryltriethoxysilanes via palladium(O)-catalyzed silylation of aryl iodides and bromides with triethoxysilane
-
The scope of the palladium-catalyzed silylation of aryl halides with triethoxysilane has been expanded to include aryl bromides. A more general Pd(0) catalyst/ligand system has been developed that activates bromides and iodides: palladium(O) dibenzylideneacetone (Pd(dba)2) is activated with 2-(di-tert-butylphosphino)biphenyl (Buchwald's ligand) (1:2 mol ratio of Pd/phosphine). Electronrich para- and meta-substituted aryl halides (including unprotected aniline and phenol derivatives) undergo silylation to form the corresponding aryltriethoxysilane in fair to excellent yield; however, ortho-substituted aryl halides failed to be silylated.
- Manoso,DeShong
-
p. 7449 - 7455
(2007/10/03)
-