223799-07-3Relevant articles and documents
Synthesis and optoelectronic properties of janus -dendrimer-type multivalent donor-acceptor systems
Dengiz, Cagatay,Breiten, Benjamin,Gisselbrecht, Jean-Paul,Boudon, Corinne,Trapp, Nils,Schweizer, W. Bernd,Diederich, Fran?ois
, p. 882 - 896 (2015/01/30)
A convergent, multistep protocol was employed for the synthesis of a Janus-type multivalent donor-acceptor system. The synthetic approach is based on a Sonogashira cross-coupling of two differently ferrocene-(Fc) substituted dendrons and a final sixfold [
Synthesis of conjugated aryleneethynylenesiloles dendron
Liu, Jie,Yan, Chenxu,Li, Shanshan,Wang, Chengyun,Shen, Yongjia
, p. 2861 - 2868 (2013/08/23)
Three routes were designed to synthesize a π-conjugated aryleneethynylenesiloles dendron. With the desilylation of the disilole mono(silylethynyl) derivative in the presence of potassium carbonate (K 2CO3), the silole-containing oligomer has been successfully synthesized without impact on the Si-(CH3)2 group. The disilole mono(silylethynyl) derivative was prepared by means of the Sonogashira heterocoupling reaction between the diacetylene compound and asymmetrical silole, catalyzed by the dichloro bis(triphenylphosphine)palladium, in a divergent synthesis. Due to their steric effect and triethynylbenzene self-coupling Glaser reaction, the endeavour to prepare the dendron by controlling the molar ratio of asymmetrical silole and 1,3,5-triethynylbenzene was failed. The another attempt to prepare the dendron by different desilylation condition of triisopropylsilyl group and trimethylsilyl group was also failed, the desilylation of Si-(CH3)2 group in silacyclopentadiene unit was also easily accomplished in the presence of tetrabutylammonium fluoride(Bu4NF), whereas no reaction occurred when K 2CO3 was used instead of Bu4NF. Copyright
An effective, orthogonal deprotection strategy for differentially functionalized, linear and Y-shaped oligo phenylene ethynylenes
Chandra, Kusum L.,Zhang, Sheng,Gorman, Christopher B.
, p. 7120 - 7132 (2008/02/07)
Several methodologies for the selective deprotection acetylenes have been reported previously. However, as is shown here, they are often not reliable or convenient. Here, an approach is reported that is efficient and general. Use of this approach to synth
Convergent synthesis of platinum-acetylide dendrimers
Onitsuka, Kiyotaka,Fujimoto, Masanori,Kitajima, Hotaka,Ohshiro, Nobuaki,Takei, Fumie,Takahashi, Shigetoshi
, p. 6433 - 6446 (2007/10/03)
An efficient convergent route to the main chain type of organometallic dendrimers, in which platinum moieties are linked by 1,3,5-triethynylbenzene, has been developed. The synthesis of platinum-acetylide dendrons involved the use of two types of trialkylsilyl groups for protection of the terminal acetylene. The platinum-acetylide dendrimers were prepared up to the third generation by reacting dendrons with a triplatinum core and a tetraplatinum core. Spectroscopic characterization and trace experiments by gel permeation chromatography indicated that the dendrimer molecules have no structural defects. Although a π-conjugated system was used as the bridging ligand, electronic and fluorescence spectra suggested that the interaction among the platinum-acetylide moieties in the dendrimers was small.
Synthesis of a Hexagonal Nanosized Macrocyclic Fluorophore with Integrated Endotopic Terpyridine Metal-Chelation Sites
Baxter, Paul N. W.
, p. 5011 - 5022 (2007/10/03)
A rigid nanosized hexagonal phenylethynyl cyclophane 5 has been prepared, which incorporates two 2,2′:6′,2″-terpyridines as integral structural units, for the purpose of binding metal ions. Macrocycle 5 was obtained by a 14-step synthesis in an overall yield of 11%, and was characterised by spectroscopic techniques. The efficiency and ease of all transformations, and the relatively enhanced yield of the final macrocyclisation suggests that the entire synthetic pathway should be amenable to scale-up. Cyclophane 5 possesses four bulky triisopropylsilyl(TIPS) -protected ethyne substituents which serve a dual role. Firstly, they solubilise the structure thereby facilitating purification and subsequent handling. Secondly, they enable post-synthetic modification in which additional functionality may be attached to the periphery of the ring. Significantly, 5 was found to be a fluorescent chromophore, and may therefore potentially function as a new sensory platform for the detection of metal ions and H-bond donating biological substrates. The structurally well-defined nanosized morphology of 5, coupled with its interesting spectroscopic properties, supports the expectation that 5 and related architectures will attain a wealth of future applications within the developing fields of nanochemistry and nanoscience.
Metal-catalyzed cross-coupling reactions for the synthesis of functionalized 1,4,5,8-tetraazafulvalenes
Kaepplinger, Christian,Beckert, Rainer
, p. 1843 - 1850 (2007/10/03)
Tetraazafulvalenes can be cross-coupled (palladium-catalyzed) with alkenes or acetylenes. Although Suzuki conditions fail, the Heck and the Sonogashira methods are useful tools for functionalizing tetraazafulvalenes. Starting from the tetraiodoaryl deriva
Synthesis of hyperbranched platinum-poly(yne) polymers by self polycondensation
Onitsuka, Kiyotaka,Ohshiro, Nobuaki,Fujimoto, Masanori,Takei, Fumie,Takahashi, Shigetoshi
, p. 159 - 166 (2007/10/03)
A hyperbranched polymer constructed by platinum-acetylide units has been synthezied by self polycondensation of a dinuclear platinum complex having one terminal acetylene and two platinum-chloride groups as an AB2 monomer in the presence of a c
Convergent route to organometallic dendrimers composed of platinum- acetylide units
Onitsuka,Fujimoto,Ohshiro,Takahashi
, p. 689 - 692 (2007/10/03)
The third-generation dendrimer with 45 platinum atoms (shown schematically) was synthesized efficiently by a convergent methodology in which two different trialkylsilyl groups (symbolized by the nodal points) are used to protect the bridging triethynylben
