نتایج جستجو برای: bridged systems

تعداد نتایج: 1189900  

F. Mollaamin K. Zare M. Sayadian

An azobenzene bridge was introduced into the lower (or smaller) rim of p-tert-butylcalix[8]arene to form 1,5-singly bridged calix[8]arene derivatives, respectively. Bridged calix[8]arene of conformationally rigid wereisolated. The stability of the two structures of bridged calix[8]arenes have been compared.The study of organicstructure to form nanoporous structures is a well known in chemistry ...

Journal: :journal of physical & theoretical chemistry 2011
m. sayadian k. zare f. mollaamin

an azobenzene bridge was introduced into the lower (or smaller) rim of p-tert-butylcalix[8]arene to form 1,5-singly bridged calix[8]arene derivatives, respectively. bridged calix[8]arene of conformationally rigid wereisolated. the stability of the two structures of bridged calix[8]arenes have been compared.the study of organicstructure to form nanoporous structures is a well known in chemistry ...

Journal: :SIAM Journal of Applied Mathematics 2001
Luqun Ni Sia Nemat-Nasser

A new class of systems of strongly singular integrodifferential equations is examined, which emerges in the study of the bridged interface crack growth, e.g., in fiber stitched layered composites. This work generalizes the asymptotic analysis of strongly singular integral equations by Willis and Nemat-Nasser [Quart. Appl. Math., 48 (1990), pp. 741–753]. Singular perturbation solutions up to the...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2000
reza mostaghim

bridged bithiazoles (5,5'-ethylene-4,4'-bithiazoles) are synthesized as a good chelating agent.

Journal: :European Journal of Inorganic Chemistry 2021

Bis- and tris-Lewis acids, based on alkynylsilanes with terminal boron functions, were prepared tested for their ability to accept neutral Lewis base molecules.

2014
Hiromasa Tanaka Kazuya Arashiba Shogo Kuriyama Akira Sasada Kazunari Nakajima Kazunari Yoshizawa Yoshiaki Nishibayashi

It is vital to design effective nitrogen fixation systems that operate under mild conditions, and to this end we recently reported an example of the catalytic formation of ammonia using a dinitrogen-bridged dimolybdenum complex bearing a pincer ligand, where up to twenty three equivalents of ammonia were produced based on the catalyst. Here we study the origin of the catalytic behaviour of the ...

Journal: :The Journal of organic chemistry 2016
Arife Yazici Uta Wille Stephen G Pyne

Novel tricyclic bridged heterocyclic systems can be readily prepared from sequential 1,4- and 1,2-addition reactions of allyl and 3-substituted allylsilanes to indolizidine and quinolizidine α,β-unsaturated N-acyliminium ions. These reactions involve a novel N-assisted, transannular 1,5-hydride shift. Such a mechanism was supported by examining the reaction of a dideuterated indolizidine, α,β-u...

Journal: :Dalton transactions 2015
Burgert Blom Günter Klatt Daniel Gallego Gengwen Tan Matthias Driess

The first N-heterocyclic silylene (NHSi) complexes of any s-block element to date are reported for calcium: [(η(5)-C5Me5)2Ca←:Si(O-C6H4-2-(t)Bu){(N(t)Bu)2CPh}] (6) and [(η(5)-C5Me5)2Ca←:Si(N(t)BuCH)2] (7). Complexes 6 and 7 are isolable in a facile way upon reaction of the corresponding free N-heterocyclic silylenes (NHSis) with [(η(5)-C5Me5)2Ca] (2). Complexes 6 and 7 were fully characterised ...

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