نتایج جستجو برای: phenylene

تعداد نتایج: 2124  

Journal: :Die Pharmazie 1997
S A Shiba A A el-Khamry M E Shaban K S Atia

The hitherto unknown bis[quinazolin-4-one-2-yl]-m-phenylene (2d), and its 3-N-substituted derivatives were prepared from the corresponding bis[3,1-benzoxazin-4-one-2-yl]-m-phenylene (1) as precursor. The quinazolinone derivative 2d was converted into bis[quinazolin-4-thioxo-2-yl]-m-phenylene (3) via different routes, bis[4-chloroquinazolin-2-yl]-m-phenylene (8) and bis[4-hydrazinoquinazolin-2-y...

Journal: :Chemical communications 2012
Dustin E Gross Emre Discekici Jeffrey S Moore

A dynamic combinatorial approach for the synthesis of arylene ethynylene macrocycles (AEMs) from linear polymers is described. By using readily available carbazolyl-ethynylene copolymers as starting materials we obtained a number of novel macrocycles that would be difficult to prepare by traditional methods.

2014
Xiao-Xiao Fu Rui-Qin Zhang Guang-Ping Zhang Zong-Liang Li

The rectifying properties of α,ω-dithiol terminated oligo(phenylene ethynylene) molecules sandwiched between heterometallic electrodes, including the molecular length and side group effects, are theoretically investigated using the fully self-consistent nonequilibrium Green's function method combined with density functional theory. The results show nonlinear variation with changes in molecule l...

2008
Hyun A Kang Hindy E. Bronstein Timothy M. Swager

The synthesis and electrochemical properties of novel block copolymers are reported. Three different norbornene derivatives having phenylene-thiophene, phenylene-bithiophene, and phenylene-furan structures were copolymerized with either norbornene or 7-oxanorbornene derivatives via ring-opening metathesis polymerization (ROMP). Block copolymers’ stabilities and solubilities could be improved by...

1998
Subodh Kumar Maninder Singh Hundal Geeta Hundal Palwinder Singh Vandana Bhalla Harjit Singh

The phase transfer catalysed nucleophilic displacement of 1,3-bis(bromomethyl)benzene, 2-methoxy-5methyl-1,3-bis(bromomethyl)benzene (2) and 1,4-bis(bromomethyl)benzene with 2-mercaptoethanol gives the respective diols 3, 4 and 12 (80–85%), which undergo intermolecular cyclodehydrochlorination with thiodiglycolyl dichloride and pyridine-2,6-dicarbonyl dichloride?HCl to provide m-phenylene (7–10...

Journal: :Chemical communications 2008
Masataka Ohashi Mahendra P Kapoor Shinji Inagaki

Amination of phenylene moieties in crystal-like mesoporous silica hybridized with phenylene is successfully achieved with close to 28% conversion of phenylene by a two-step chemical transformation process while preserving both the ordered mesostructure and crystal-like molecular scale periodicity of the parent material.

Journal: :علوم و تکنولوژی پلیمر 0
محمدعلی سمسارزاده آرزو دادخواه

kevlar is one of the fbers which is used in heavy industrial productions such as, shipping, military and weaving for reinforcement of composites. initial polymer of kevlar or poly(para-phenylene terephthalamide) is an oriented liquid crystal polymer. existence of aromatic group in the main chain leads to formation of rigid-rod molecules in the polymer, high strength and high modulus in it is fb...

Journal: :Materials advances 2021

Phenylene–ethynylene–anthracene copolymer was used as the emitter in triplet–triplet annihilation upconversion outperforming well-known poly(phenylene–vinylene)s.

Journal: :Chemical communications 2009
Gustavo Fernández Fátima García Fátima Aparicio Emilio Matesanz Luis Sánchez

Nanographite-like lamellae are obtained by the self-assembly of rectangular OPE amphiphiles peripherally decorated with polar and paraffinic chains.

Journal: :Journal of Porphyrins and Phthalocyanines 2021

Increasing the number of meso-methine carbons porphyrin has led to a creation series vinylogous expanded porphyrins, while introduction an ortho-phenylene-unit as pyrrole-connecting two-carbon bridge usually leads prevention effective macrocyclic conjugation. Cyclopentene can serve conjugative increase conjugation owing its cis-geometry. In this work, ortho-phenylene-cyclopentene-bridged tetrap...

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