نتایج جستجو برای: norbornene derivatives
تعداد نتایج: 105368 فیلتر نتایج به سال:
In the title compound, C(17)H(11)Cl(6)NO(2), the six-membered ring of the norbornene moiety adopts a boat conformation whereas the two five-membered rings adopt envelope conformations. The phenyl ring and the ring of the succinimide moiety are almost coplanar [dihedral angle = 7.44 (14)°]. The crystal packing is stabilized by a weak inter-molecular C-H⋯O hydrogen bond.
The synthesis of polynorbornene by ring opening metathesis polymerization (ROMP) in the presence of 1 2 generation Grubbs catalyst-functionalized nanotubes, is reported. A characterization of the 2 generation Grubbs catalystfunctionalized nanotubes was performed by TGA (Thermogravimetric Analysis) on-line connected with a quadrupole-mass spectrometer, in order to quantify the amount of catalyst...
Recent decades have seen a burgeoning of interest in olefin metathesis, as witnessed by a rapidly growing number of elegant applications. Using this tool, chemists can now efficiently synthesize an impressive range of molecules that only a decade ago required significantly longer and tedious routes.[1] Several types of olefin metathesis have been identified so far, among them ring-closing metat...
A series of iron oxide doped norbornene (NOR)/deuterated norbornene dicarboxylic acid (NORCOOH) diblock copolymers were synthesized and characterized by X-ray photoelectron spectroscopy (XPS), small angle neutron scattering (SANS) and superconducting quantum interference device (SQUID) experiments. g-Fe2O3 nanoparticles were synthesized within the microdomains of diblock copolymers with volume ...
We consider the task of filtering the noise from images and other types of inputs which are assumed to be piecewise continuous and piecewise monotone. We show that nonlinear diffusion of the data, a powerful filtering method, is too restrictive for such a case, leading to piecewise constant functions. We claim that the piecewise monotonicity can be enhanced by nonlinear diffusion of first parti...
In this study, the reactions of the bimetallic compound Na[W2(μ-Cl)3Cl4(THF)2]·(THF)3 (1, (W 3 W), a'e') with norbornene (NBE) and some of its derivatives (5-X-2-NBE; X = COOH (NBE–COOH), OH (NBE–OH), CN (NBE–CN), COOMe (NBE–COOMe), CH=CH2 (VNBE); norbornadiene (NBD)) are described. Complex 1 contains a tungsten–tungsten triple bond, bearing three halide bridges and two labile THF ligands, in a...
Based on the local Shannon entropy concept in information theory, a new measure of aromaticity is introduced. This index, which describes the probability of electronic charge distribution between atoms in a given ring, is called Shannon aromaticity (SA). Using B3LYP method and different basis sets (6-31G**, 6-31+G** and 6-311++G**), the SA values of some five-membered heterocycles, C(4)H(4)X, a...
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