نتایج جستجو برای: isomerization of chloro

تعداد نتایج: 21165937  

Journal: :Chemistry 2005
Andrey Yu Kovalevsky Graham King Kimberly A Bagley Philip Coppens

Photocrystallographic experiments show that laser exposure of crystals of [Ru(bpy)2(NO)(NO2)](PF6)2 at 90 K produces a double isonitrosyl-nitrito linkage isomer and provide the detailed geometry of the metastable species generated. The analysis indicates that the isomerization is accomplished through an intramolecular redox reaction involving oxygen transfer from the nitro to the nitrosyl group...

Journal: :The Journal of biological chemistry 2001
L Motteran M S Pilone G Molla S Ghisla L Pollegioni

Brevibacterium sterolicum possesses two forms of cholesterol oxidase, one containing noncovalently bound FAD, the second containing a FAD covalently linked to His(69) of the protein backbone. The functional role of the histidyl-FAD bond in the latter cholesterol oxidase was addressed by studying the properties of the H69A mutant in which the FAD is bound tightly, but not covalently, and by comp...

Journal: :Molecules 2017
Junren Zhang Qizheng Yao Zuliang Liu

Background: Halofuginone hydrobromide (1) is recognized as an effective drug against several species of Eimeria (E.) in poultry. In this paper, we describe a convenient and low cost preparation method for the compound, as well as primary validation of its activity. Methods: First, 7-bromo-6-chloroquinazolin-4(3H)-one (2) was prepared from m-chlorotoluene by a conventional process, and then chlo...

Journal: :Angewandte Chemie 2015
Jonathan Dilger Lihi Musbat Mordechai Sheves Anastasia V Bochenkova David E Clemmer Yoni Toker

Isomerizations of the retinal chromophore were investigated using the IMS-IMS technique. Four different structural features of the chromophore were observed, isolated, excited collisionally, and the resulting isomer and fragment distributions were measured. By establishing the threshold activation voltages for isomerization for each of the reaction pathways, and by measuring the threshold activ...

Journal: :Biochemistry 2000
J K McBee V Kuksa R Alvarez A R de Lera O Prezhdo F Haeseleer I Sokal K Palczewski

In the retinal rod and cone photoreceptors, light photoactivates rhodopsin or cone visual pigments by converting 11-cis-retinal to all-trans-retinal, the process that ultimately results in phototransduction and visual sensation. The production of 11-cis-retinal in adjacent retinal pigment epithelial (RPE) cells is a fundamental process that allows regeneration of the vertebrate visual system. H...

Journal: :Acta Crystallographica Section E Structure Reports Online 2008

Journal: :Molecules 2015
Neha Phadke Michael Findlater

The synthesis of a series of allene complexes (POCOP)Ir(η²-RC=(.)=CR') 1b-4b (POCOP = 2,6-bis(di-tert-butylphosphonito)benzene) via isomerization of internal alkynes is reported. We have demonstrated that the application of this methodology is viable for the isomerization of a wide variety of alkyne substrates. Deuterium labeling experiments support our proposed mechanism. The structures of the...

Journal: :Physical chemistry chemical physics : PCCP 2010
Yasuhiro Shiraishi Masataka Itoh Takayuki Hirai

Thermally-induced isomerization of spiropyran derivatives in aqueous media has been studied. The colorless spirocyclic (SP) forms of spiropyran derivatives are isomerized to colored merocyanine (MC) forms even in dark conditions at elevated temperature. Equilibrium, kinetic, and deuterium experiments reveal that the thermal SP → MC isomerization is due to the stabilization of MC form by a hydro...

1997
H. ISHIKAWA C. NAGAO MA

Among various kinds of bond-breaking isomerization reactions, the isomerization of a triatomic monohydride, HAB, is the simplest one: HAB ABH. This system is most fundamental for both experimental and theoretical studies. On the basis of a time-independent picture, the isomerization process can be characterized by analysis of rotation-vibration eigenstates in the high energy region. In this stu...

Journal: :Organic & biomolecular chemistry 2013
Bernd Schmidt Sylvia Hauke

Under standard conditions the cross metathesis of allyl alcohols and methyl acrylate is accompanied by the formation of ketones, resulting from uncontrolled and undesired double bond isomerization. By conducting the CM in the presence of phenol, the catalyst loading and the reaction time required for quantiative conversion can be reduced, and isomerization can be suppressed. On the other hand, ...

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