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Direct Transformation (direct + transformation)

Distribution by Scientific Domains

Chemistry	87%

Selected Abstracts

Direct Transformation of Methyl Arenes to Aryl Nitriles at Room Temperature,

ANGEWANDTE CHEMIE, Issue 38 2009
Wang Zhou
Drei C-H-Bindungen werden bei der direkten Umwandlung von Methylarenen in Arylnitrile unter milden neutralen Bedingungen gespalten (siehe Schema). Dieses Verfahren liefert synthetisch und medizinisch wichtige Arylnitrile unter C-H-Funktionalisierung. PIDA=Phenyliodoniumdiacetat. [source]

ChemInform Abstract: A New Strategy of the Chemical Route to the Cyclopropane Structure: Direct Transformation of Benzylidenemalononitriles and Malononitrile into 1,1,2,2-Tetracyanocyclopropanes.

CHEMINFORM, Issue 22 2008
Michail N. Elinson
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Microwave-Assisted Direct Transformation of Amines to Ketones Using Water as an Oxygen Source.

CHEMINFORM, Issue 37 2005
Akira Miyazawa
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Alkylation of Magnesium Sulfinates: A Direct Transformation of Functionalized Aromatic/Heteroaromatic Halides into Sulfones.

CHEMINFORM, Issue 33 2005
Jiang-Ping Wu
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Direct Transformation of Aldehydes to Nitriles Using Iodine in Ammonia Water.

CHEMINFORM, Issue 22 2001
Sanjay Talukdar
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Surface-Protected Etching of Mesoporous Oxide Shells for the Stabilization of Metal Nanocatalysts

ADVANCED FUNCTIONAL MATERIALS, Issue 14 2010
Qiao Zhang
Abstract Nanoparticles of transition metals, particularly noble metals, are widely used in catalysis. However, enhancing their stability during catalytic reactions has been a challenge that has limited the full use of the benefits associated with their small size. In this Feature Article, a general "encapsulation and etching" strategy for the fabrication of nanocatalyst systems is introduced in which catalyst nanoparticles are protected within porous shells. The novelty of this approach lies in the use of chemical etching to assist the creation of mesopores in a protective oxide shell to promote efficient mass transfer to encapsulated metal nanoparticles. The etching process allows for the direct transformation of dense silica coatings into porous shells so that chemical species can reach the catalyst surface to participate in reactions while the shells act as physical barriers against aggregation of the catalyst particles. By using the surface-protected etching process, both yolk,shell and core,satellite type nanoreactors are synthesized and their utilization in liquid- and gas-phase catalysis is demonstrated. The thermal and chemical stability of the metallic cores during catalytic reactions is also investigated, and further work is carried out to enhance recyclability via the introduction of superparamagnetic components into the nanoreactor framework. [source]

Imidazolium Polyoxometalate: An Ionic Liquid Catalyst for Esterification and Oxidative Esterification

CHEMCATCHEM, Issue 9 2010
Huan Li
Abstract A new family of polyoxometalate-based ionic liquids (POM-IL) is synthesized, characterized, and employed as catalysts in the esterification of various alcohols with acetic acid. The ionic liquid catalyst shows high activity and gives excellent yields of esters. An emulsion forms between the IL catalyst and substrates during the reaction and promotes the catalytic process. After reaction, the emulsion can conveniently be broken by the addition of a weakly polar organic solvent to facilitate the separation of the catalyst. On the basis of the above results, a direct transformation of benzaldehyde to methyl ester under relatively mild conditions is also developed in the absence of any cocatalyst. Finally, the scope of the substrates and recyclability of the catalyst are also investigated. [source]

N -Fusion Approach in Construction of Contracted Carbaporphyrinoids: Formation of N -Fused Telluraporphyrin

CHEMISTRY - A EUROPEAN JOURNAL, Issue 41 2009
Ewa Pacholska-Dudziak Dr.
Abstract Insertion of PCl3 into 5,10,15,20-tetraaryl-21-telluraporphyrin leads to a phosphorus complex of N -fused dihydrotelluraporphyrin with an inverted tellurophene ring. Its CNN coordination core places the macrocycle in the family of contracted carbaporphyrinoids. A cycle of direct transformations affords an elegant triangle of three mutually convertible N -fused porphyrinoids, with distinct spectroscopic features: antiaromatic, nonaromatic and aromatic. The nonaromatic species has a dome shaped skeleton which forms in the solid state a ball and socket structure with C60. W wyniku insercji trójchlorku fosforu do 5,10,15,20-tetraarylo-21-telluraporfiryny otrzymano fosforowy kompleks skondensowanej dihydrotelluraporfiryny z odwróconym pier,cieniem tellurofenowym. Trójkoordynacyjny rdze, CNN tak powsta,ego makrocykla klasyfikuje go do rodziny zmniejszonych karbaporfirynoidów. Zsyntezowano trzy pokrewne kompleksy tego typu (antyaromatyczny, niearomatyczny i aromatyczny), mog,ce wzajemnie przekszta,ca, si, w siebie. Ró,ni, si, one zasadniczo w,a,ciwo,ciami spektroskopowymi. Zwi,zek niearomatyczny charakteryzuje si, bardzo pofa,dowanym szkieletem i kokrystalizuje z fulerenem C60 dopasowuj,c si, wkl,s,, stron, do jego wypuk,ej powierzchni. [source]