نتایج جستجو برای: vinyl ethers

تعداد نتایج: 18595  

Journal: :Journal of the American Chemical Society 2004
Benjamin D Sherry F Dean Toste

Homoallenic alcohols are prepared from propargyl vinyl ethers using a trinuclear gold(I)-oxo complex, [(Ph3PAu)3O]BF4, as a catalyst for propargyl Claisen rearrangement at room temperature. The gold(I)-catalyzed reaction is effective for a diverse collection of propargyl vinyl ethers, including substrates containing aryl and alkyl groups at the propargylic position, and hydrogen, aryl, and alky...

Bita Mohtat Delaram Abdolahi,

7-hydroxy coumarin undergoes neutral conditions with alkyl propiolates in the presence of triphenylphosphine, and bysubstituation the corresponding aryl vinyl ethers was obtained in good yields

Behnaz Shahrokh Garnik Sargsyan

In this research, a semi empirical approach has been suggested for calculating the activation energyof unimolecular thermal decomposition of vinyl ethers yielding saturated products. The calculationprocedure is based on the use of molecular mechanics (MM) methods. These methods which involvethe construction of the transition state for a molecule mainly consider the formation of a “HydrogenBridg...

Journal: :journal of physical & theoretical chemistry 2014
behnaz shahrokh garnik sargsyan

in this research, a semi empirical approach has been suggested for calculating the activation energyof unimolecular thermal decomposition of vinyl ethers yielding saturated products. the calculationprocedure is based on the use of molecular mechanics (mm) methods. these methods which involvethe construction of the transition state for a molecule mainly consider the formation of a “hydrogenbridg...

Journal: :Chemical Society reviews 2013
David Tejedor Gabriela Méndez-Abt Leandro Cotos Fernando García-Tellado

The propargyl Claisen rearrangement is a known protocol to gain access to functionalized allenes through the [3,3]-sigmatropic transformation of propargyl vinyl ethers. The correct use of appropriate propargyl vinyl ethers as starting materials coupled with suitable reaction conditions can aid in the development of new domino methodologies in which the allenes are valuable intermediates in rout...

2004
E. K. Kim N. A. Stacey B. J. Smith M. D. Dickey S. C. Johnson B. C. Trinque C. G. Willson

Until now, acrylates have been the monomers of choice for use for step and flash imprint lithography ~SFIL! etch barrier formulations, in part because of the commercial availability of silicon-containing acrylates ~necessary for etch resistance!, together with their low viscosities and capability for rapid photopolymerization. However, despite many desirable properties, the polymerization of ac...

Journal: :Organic & biomolecular chemistry 2014
Natasha F O'Rourke Jeremy E Wulff

Kinetic investigations of substituent effects in the thermal rearrangement of bis-vinyl ether substrates are reported. Findings indicate that the influence of the various substituent patterns on the rate of rearrangement in these compounds differs from that documented in the literature for the analogous [3,3]-sigmatropic rearrangement of allyl vinyl ethers. In addition, the thermochemical data ...

Journal: :The Journal of organic chemistry 2013
Takeo Nakano Takahiro Soeta Kohei Endo Katsuhiko Inomata Yutaka Ukaji

The sequential 1,4-elimination reaction of (E)-4-alkoxy-2-butenyl benzoates and [1,2]-Wittig rearrangement gave (2Z,4E)-2,4-pentadien-1-ols stereoselectively. Z-Selective formation of intermediary vinyl ethers, whose stereochemistry was well elucidated by the "syn-effect", was achieved by treatment of the 2-butenyl benzoates with KOH in the presence of Pd catalyst. The subsequent [1,2]-Wittg re...

Journal: :polyolefins journal 2015
walter kaminsky mercia fernandes

beside ziegler-natta and phillips catalysts the development of methylaluminoxane (mao) as cocatalyst incombination with metallocenes or other transition metal complexes for the polymerization of olefins haswidely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. these catalysts allow the synthesis of isot...

Journal: Polyolefins Journal 2015
Mercia Fernandes Walter Kaminsky,

Beside Ziegler-Natta and Phillips catalysts the development of methylaluminoxane (MAO) as cocatalyst in combination with metallocenes or other transition metal complexes for the polymerization of olefins has widely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. These catalysts allow the synthesis of is...

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