نتایج جستجو برای: Trityl chloride (Ph3CCl)

تعداد نتایج: 88087  

Abdolkarim Zare Maria Merajoddin Mohammad Ali Zolfigol

Organocatalyst trityl chloride (Ph3CCl), by in situ formation of trityl carbocation with inherent instability, efficiently catalyzes the condensation of dimedone (5,5-dimethyl-1,3-cyclohexanedione) (2 equiv.) with arylaldehydes (1 equiv.) under solvent-free conditions to afford 9-aryl-1,8-dioxo-octahydroxanthenes in high to excellent yields and in relatively short reaction times. Formation of t...

Abdolkarim Zare Maria Merajoddin Mohammad Ali Zolfigol

Organocatalyst trityl chloride (Ph3CCl), by in situ formation of trityl carbocation with inherent instability, efficiently catalyzes the condensation of dimedone (5,5-dimethyl-1,3-cyclohexanedione) (2 equiv.) with arylaldehydes (1 equiv.) under solvent-free conditions to afford 9-aryl-1,8-dioxo-octahydroxanthenes in high to excellent yields and in relatively short reaction times. Formation of t...

Journal: :iranian journal of catalysis 2013
abdolkarim zare maria merajoddin mohammad ali zolfigol

organocatalyst trityl chloride (ph3ccl), by in situ formation of trityl carbocation with inherent instability, efficiently catalyzes the condensation of dimedone (5,5-dimethyl-1,3-cyclohexanedione) (2 equiv.) with arylaldehydes (1 equiv.) under solvent-free conditions to afford 9-aryl-1,8-dioxo-octahydroxanthenes in high to excellent yields and in relatively short reaction times. formation of t...

Journal: :Dalton transactions 2006
Mark H Hannant Joseph A Wright Simon J Lancaster David L Hughes Peter N Horton Manfred Bochmann

The successive addition of KCN and Ph3CCl to B(C6F4-C6F5-2)3 (PBB) affords triphenylmethyl salts of the [NC-PBB]- anion. By contrast, the analogous reaction with sodium dicyanamide followed by treatment with Ph(3)CCl leads to the zwitterionic aminoborane H2NB(C12F9)2C12F8, via nucleophilic attack on an o-F atom, together with CPh3[F-PBB]. Whereas treatment of [NC-PBB]- with either PBB or B(C6F5...

2015
Keisuke Yoshikiyo Yoshihisa Matsui Tatsuyuki Yamamoto

The quantitative analysis of reaction products showed that the reaction of 6(A),6(D)-di-O-trityl-α-cyclodextrin (CD), AD-isomer, with trityl chloride in pyridine at 55 °C gave 6(A),6(B),6(E)-tri-O-trityl-α-CD, the amount of which was only 25% of that of simultaneously formed 6(A),6(B),6(D)-tri-O-trityl-α-CD. This indicates that the bulky trityl groups of glucopyranose-A and -D (Glu-A and -D, re...

Journal: :Molecular pharmacology 2006
Sandra Liekens Annelies Bronckaers Ana-Isabel Hernández Eva-María Priego Elena Casanova Maria-José Camarasa Maria-Jesus Pérez-Pérez Jan Balzarini

Thymidine phosphorylase (TPase) is one of the key enzymes involved in the pyrimidine nucleoside salvage pathway. However, TPase also stimulates angiogenesis, and its expression correlates well with microvessel density and metastasis in a variety of human tumors. We have shown recently that 5'-O-trityl-inosine (KIN59) allosterically inhibits TPase enzymatic activity. KIN59 also inhibits TPase-in...

Journal: :International journal of organic chemistry 2013
Macduff Okuom Mark Wilson Jordan Groathouse Junsik Lee Dave Symonsbergen Casey Gustafson Mitch Trauernicht Homar Barcena Cassie Reicks Sharmin Sikich Raychelle Burks Andrea Holmes

The synthesis and characterization of a novel fluorophore(1), with potential application as an optical brightener are reported. This compound was prepared by reacting 4,4-diaminostilbene-2,2-disulfonic acid with cyanuric chloride in the presence of Na2CO3 followed by the addition of trityl aniline. Solution and solid state fluorescence demonstrated a strong blue/purple emission centered at 450 ...

Journal: :Organic & biomolecular chemistry 2011
Yan-Chao Wu Hui-Jing Li Li Liu Zhe Liu Dong Wang Yong-Jun Chen

The treatment of β,γ-unsaturated α-ketoesters with phenols in the presence of trityl chloride and 4 Å molecular sieves in refluxing trifluoroacetic acid afforded 4-aryl-2H-chromenes in high yields, in which a reverse of the regiochemistry of Jørgensen-Rutjes chromane synthesis was observed. The isolation of 4H-chromene intermediates, confirmed by single-crystal X-ray analysis, indicates that th...

Journal: :Dalton transactions 2016
Abdulrahman D Ibrahim Kenan Tokmic Marshall R Brennan Dongyoung Kim Ellen M Matson Mark J Nilges Jeffery A Bertke Alison R Fout

The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene ((Ar)CCC, Ar = 2,6-diispropylphenyl or mesityl) are reported. Cleavage of the aryl C-H bond of the ligand was achieved in a one-pot metalation procedure using Co(N(SiMe3)2)2(py)2, an equivalent of exogenous base, and trityl chloride t...

Mahmoud Zarei was born in Hamedan, Iran in1986. He received his B.Sc. in Pure Chemistry (2010) from Islamic Azad University Arak and M.Sc. in Organic Chemistry (2013) at Bu-Ali Sina University, Iran. He is currently working towards his Ph.D. under the supervision of Professor Mohammad Ali Zolfigol. His research interest is catalysis, including the application of homogeneous and heterogeneous ca...

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