15797-52-1Relevant articles and documents
Facile synthetic routes to phenylene and triazine core based dendritic cobaltabisdicarbollides
Dash, Barada Prasanna,Satapathy, Rashmirekha,Maguire, John A.,Hosmane, Narayan S.
, p. 5230 - 5235 (2010)
The synthesis and thermal properties of phenylene and triazine core based symmetrical macromolecules containing three to six cobaltabis(dicarbollide) clusters are reported. The zwitterionic oxonium derivative of cobaltabis(dicarbollide), [3,3′-Co(8-C4H8O 2-1,2-C2B9H10)(1′,2′- C2B9H11)], has been used for the synthetic transformations, and silicon tetrachloride and triflic acid were used as the cyclotrimerization reagents. Compounds containing multiple cobaltabis(dicarbollide) clusters are found to be extremely thermally stable, and only a 10-30% mass loss occurred up to 700 °C.
Near-Infrared Phosphorescent Supramolecular Alkyl/Aryl-Iridium Porphyrin Assemblies by Axial Coordination
Che, Chi-Ming,Guan, Xiangguo,Huang, Jie-Sheng,Qin, Lin,Yang, Chen
, p. 14400 - 14408 (2018)
Five-coordinated d6 metal complexes are relatively uncommon but can be useful building blocks for the construction of supramolecular assemblies. In this work we have used the strong trans effect of aryl and alkyl ligands for the synthesis of lu
Novel electron-beam molecular resists with high resolution and high sensitivity for nanometer lithography
Kadota, Toshiaki,Kageyama, Hiroshi,Wakaya, Fujio,Gamo, Kenji,Shirota, Yasuhiko
, p. 706 - 707 (2004)
A novel class of chemically-amplified, electron-beam molecular resists for nanometer lithography were created. These molecular resists functioned as positive resists in the presence of an acid generator, exhibiting a high sensitivity of ≈2 μC cm-2/s
A new method for the preparation of 1,3,5-triarylbenzenes catalyzed by nanoclinoptilolite/HDTMA
Tayebee,Jarrahi,Maleki,Kargar Razi,Mokhtari,Baghbanian
, p. 10869 - 10877 (2015)
A new natural surface modified nanoclinoptilolite (NCP) was prepared and applied as an efficient catalyst for the cyclotrimerization of acetophenones to obtain 1,3,5-triarylbenzenes. The results showed that the efficiency of this catalytic system was enhanced due to the surface modification by hexadecyltrimethylammonium bromide (HDTMA-Br). This proposed protocol brings about significant economic and environmental advantages, such as operational simplicity, short reaction time, mild reaction conditions, good reaction yield, and high recyclability of the catalyst. Furthermore, the only side product of the reaction is water, which makes this methodology an environmentally friendly process.
Hydroxyphenylbenzene derivatives as glass forming molecules for high resolution photoresists
Ober, Christopher K.,De Silva, Anuja
, p. 1903 - 1910 (2008)
This paper presents a fundamental study to relate molecular architecture to the amorphous properties of hydroxyphenylbenzene molecular glass derivatives. These studies demonstrates that the branched hydroxyphenylbenzene derivatives can form stable molecular glasses despite the π-π interactions present. Through this research, design concepts to stabilize the amorphous nature and to increase the glass transition temperature (Tg) based on asymmetric molecular structures, bulky substituents, conformation states and molecular size are explored. An understanding of such behavior is important for the development of hydroxyphenylbenzene derivatives as potential molecular photoresists for patterning below 50 nm. This research has helped to identify potential candidates to be evaluated as positive-tone photoresists for lithographic applications for extreme ultraviolet (EUV, λ = 13.4 nm) lithography. The first reported sub-30 nm feature sizes for hydroxyphenylbenzene derivatives were demonstrated with high Tg materials. The Royal Society of Chemistry.
H6P2W18O62/Nanoclinoptilolite as an efficient nanohybrid catalyst in the cyclotrimerization of aryl methyl ketones under solvent-free conditions
Tayebee,Jarrahi
, p. 21206 - 21214 (2015)
A new type of nanohybrid material H6P2W18O62/nanoclinoptilolite was fabricated and performed as an efficient and reusable catalyst in the mild and one-pot condensation of different acetophenones. The operational simplicity, easy work-up, cost-effective, and solvent-free nature of the present methodology were accompanied with good to excellent yields of the desired 1,3,5-triarylbenzenes from a wide range of alkyl, aryl, and cyclic ketones. The nanocatalyst was prepared via immobilization of Wells-Dawson heteropolyacid H6P2W18O62 (HPA) on the surface of nanoclinoptilolite (NCP). The nanohybrid material was easily recovered and reused successfully at least seven times without significant loss of catalytic activity. XRD, SEM, UV-Vis, MS-ICP, DTA, and FT-IR studies confirmed that the heteropolyacid is well dispersed on the surface of NCP. This protocol developed is a safe and convenient alternate method for the synthesis of 1,3,5-triarylbenzenes utilizing an eco-friendly and a highly reusable natural nanocatalyst. Furthermore, water was the only by-product, which made the present methodology environmentally benign.
Single-Crystalline MFI Zeolite with Sheet-Like Mesopores Layered along the a Axis
Zhang, Yunjuan,Shen, Xuefeng,Gong, Zheng,Han, Lu,Sun, Huai,Che, Shunai
, p. 738 - 742 (2019)
Designing a templating strategy for directing mesopore growth along different crystallographic directions is essential for fabricating two- or three-dimensional single-crystalline mesoporous zeolites. However, so far, mesopores formed in MFI zeolites by soft templates have mostly been generated by disrupting growth along the b axis; generating mesopores by disrupting growth along the a axis is rare. Herein, a single-crystalline mesoporous MFI zeolite (SCMMZ) with sheet-like mesopores layered along the a and b axes was synthesized using a triply branched surfactant with diquaternary ammonium groups connected to 1,3,5-triphenylbenzene by a six- and eight-carbon alkyl chain (TPB-6 and 8). The sheet-like mesopores were embedded in the MFI framework and were retained even after calcination. Molecular mechanics calculations provided evidence of low binding energy configurations of the surfactant that directed the growth of straight and zigzag channels along the b and a axes, respectively. The formation of nanosheets was attributed to the geometric matching of the arrangement of the aromatic groups to the zeolite framework.
Environmentally friendly cyclotrimerization of substituted acetophenones catalyzed by a new nanocomposite of γ-Al2O3 nanoparticles decorated with H5PW10V2O40
Tayebee, Reza,Savoji, Kokab,Razi, Maryam Kargar,Maleki, Behrooz
, p. 55319 - 55326 (2016)
A highly efficient and simple procedure for the synthesis of substituted benzenes is described. A range of aryl and alkyl ketones were used to conduct triple condensation reactions in the presence of a catalytic amount of nano-Al2O3/
Design and synthesis of C3-symmetric molecules containing oxepine and benzofuran moieties via Metathesis
Gupta, Naveen Kumar,Kotha, Sambasivarao,Solanke, Balaji. U.
, (2021/07/17)
We report a new synthetic strategy to C3-symmetric star-shaped phenyl and triazine central cores bearing oxepine and benzofuran ring systems. In this regard, we have explored the application of metathetic strategy to construct C3-sym
Aryl Triflates in On-Surface Chemistry
Fuchs, Harald,Gao, Hong-Ying,Klaasen, Henning,Neugebauer, Johannes,Ren, Jindong,Studer, Armido,Viergutz, Lena,Witteler, Melanie C.
, p. 16727 - 16732 (2020/12/01)
The reactivity of aryl triflates in on-surface C?C coupling is reported. It is shown that the triflate group in aryl triflates enables regioselective homo coupling with preceding or concomitant hydrodetriflation on Cu(111). Three different symmetrical π-s
