4342-22-7Relevant academic research and scientific papers
Hydrosilylation of carbonyls over electron-enriched Ni sites of intermetallic compound Ni3Ga heterogeneous catalyst
Takayama, Tomoaki,Kariya, Rio,Nakaya, Yuki,Furukawa, Shinya,Yamazoe, Seiji,Komatsu, Takayuki
supporting information, p. 4239 - 4242 (2021/05/05)
Nanoparticulate intermetallic compound Ni3Ga supported on SiO2has emerged as a highly efficient catalyst for the hydrosilylation of carbonyls, such as aldehydes and ketones, at room temperature. Formation of electron-enriched Niviaal
Silyl Tosylate Precursors to Cyclohexyne, 1,2-Cyclohexadiene, and 1,2-Cycloheptadiene
McVeigh, Matthew S.,Kelleghan, Andrew V.,Yamano, Michael M.,Knapp, Rachel R.,Garg, Neil K.
, p. 4500 - 4504 (2020/06/08)
Transient strained cyclic intermediates have become valuable intermediates in modern synthetic chemistry. Although silyl triflate precursors to strained intermediates are most often employed, the instability of some silyl triflates warrants the developmen
One-Pot Synthesis of Silylated Enol Triflates from Silyl Enol Ethers for Cyclohexynes and 1,2-Cyclohexadienes
Inoue, Kazuki,Nakura, Ryo,Okano, Kentaro,Mori, Atsunori
supporting information, p. 3343 - 3347 (2018/07/13)
Regiocontrolled synthesis of precursors for strained cyclohexynes and 1,2-cyclohexadienes is described based on one-pot rearrangement of silyl enol ether followed by formation of enol triflate. Treatment of silyl enol ether with a combination of LDA and tBuOK led to the migration of the silyl group to generate α-silyl enolate, which was treated with Comins' reagent to provide the corresponding enol triflate. The transient α-silylated lithium enolate was smoothly isomerized in the presence of stoichiometric amount of water within one hour at room temperature, providing precursors for cyclohexynes exclusively in one pot. Effects of silyl groups, isomerization of the lithium enolate, and regiocontrolled generation of these precursors for these strained molecules were also investigated.
Supported Palladium-Gold Alloy Catalysts for Efficient and Selective Hydrosilylation under Mild Conditions with Isolated Single Palladium Atoms in Alloy Nanoparticles as the Main Active Site
Miura, Hiroki,Endo, Keisuke,Ogawa, Ryoichi,Shishido, Tetsuya
, p. 1543 - 1553 (2017/08/17)
Supported Pd-Au alloy catalysts were developed for the highly efficient and selective hydrosilylation of α,β-unsaturated ketones and alkynes. The Pd/Au atomic ratio of the Pd-Au alloy and the supporting material affected the catalytic activity, and supported Pd-Au alloy nanoparticles with a low Pd/Au atomic ratio functioned as highly active heterogeneous catalysts under mild reaction conditions. Structural characterization of supported Pd-Au alloy catalysts by X-ray diffraction, X-ray absorption spectroscopy (XAS), and transmission electron microscopy revealed the formation of random Pd-Au alloy nanoparticles with a uniform size of around 3 nm on the support. Furthermore, XAS and X-ray photoelectron spectroscopy elucidated the charge transfer from Pd to Au and the formation of isolated single Pd atoms in random Pd-Au alloys with a low Pd/Au ratio, which enabled efficient hydrosilylation of a variety of substrates under mild reaction conditions.
Photo Lewis acid generators: Photorelease of B(C6F5)3 and applications to catalysis
Khalimon, Andrey Y.,Shaw, Bryan K.,Marwitz, Adam J. V.,Piers, Warren E.,Blackwell, James M.,Parvez, Masood
supporting information, p. 18196 - 18206 (2015/10/28)
A series of molecules capable of releasing of the strong organometallic Lewis acid B(C6F5)3 upon exposure to 254 nm light have been developed. These photo Lewis acid generators (PhLAGs) can now serve as photoinitiators for several important B(C6F5)3-catalyzed reactions. Herein is described the synthesis of the triphenylsulfonium and diphenyliodonium salts of carbamato- and hydridoborates, their establishment as PhLAGs, and studies aimed at defining the mechanism of borane release. Factors affecting these photolytic reactions and the application of this concept to photoinduced hydrosilylation reactions and construction of siloxane scaffolds are also discussed.
Highly diastereoselective preparation of aldol products using new functionalized allylic aluminum reagents
Shen, Zhi-Liang,Peng, Zhihua,Yang, Chun-Ming,Helberg, Julian,Mayer, Peter,Marek, Ilan,Knochel, Paul
supporting information, p. 956 - 959 (2014/03/21)
Chloro-substituted triethylsilyl enol ethers derived from cyclohexanone and related ketones are converted with aluminum powder in the presence of indium trichloride to functionalized allylic aluminum reagents which represent a new type of synthetic equiva
Synthesis of a rhodium carbonyl phosphaalkenyl-phosphido complex: A phosphorus congener of schiff base Type N,N′-Chelating monoanionic ligands
Matsumoto, Teruyuki,Sasamori, Takahiro,Miyake, Hideaki,Tokitoh, Norihiro
supporting information, p. 1341 - 1344 (2014/04/17)
A monoanionic, bidentate phosphaalkenyl-phosphido ligand was designed, synthesized, and used for the complexation of a rhodium carbonyl fragment. The characterization of the latter revealed delocalized π electrons on the phosphaalkenyl-phosphide moiety. T
The synergistic effect of nanoporous AuPd alloy catalysts on highly chemoselective 1,4-hydrosilylation of conjugated cyclic enones
Chen, Qiang,Tanaka, Shinya,Fujita, Takeshi,Chen, Luyang,Minato, Taketoshi,Ishikawa, Yoshifumi,Chen, Mingwei,Asao, Naoki,Yamamoto, Yoshinori,Jin, Tienan
supporting information, p. 3344 - 3346 (2014/03/21)
The nanoporous AuPd (AuPdNPore) alloy catalyst showed superior chemoselectivity and high catalytic activity for the direct 1,4-hydrosilylation of the conjugated cyclic enones with hydrosilane in comparison with the monometallic nanoporous Au and Pd catalysts. The enhanced catalytic properties of AuPdNPore arise mainly from the nanoporous structure and the synergistic effect of the AuPd alloy. The Royal Society of Chemistry 2014.
Palladium on charcoal as a catalyst for stoichiometric chemo- and stereoselective hydrosilylations and hydrogenations with triethylsilane
Tuokko, Sakari,Pihko, Petri M.
, p. 1740 - 1751 (2015/02/19)
Stoichiometric quantities of triethylsilane in the presence of activated Pd/C as the catalyst can be used to effect chemo-, regio-, and stereoselective hydrosilylation and transfer hydrogenation reactions. α,β-Unsaturated aldehydes and ketones are selectively hydrosilylated to give the corresponding enol silanes or transfer hydrogenated to give the saturated carbonyl compounds in the presence of other reducible functional groups.
METHODS AND COMPOUNDS FOR PHOTO LEWIS ACID GENERATION AND USES THEREOF
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Page/Page column 37; 38, (2013/10/21)
There are disclosed masked Lewis acids into compounds in which the Lewis acid can be released by exposure of the compound to light, especially ultraviolet light. These compounds can be represented by the following formula (I): ([(AEX(3-n))(n+1)Yn](n+1)-)m(Qm+)(n+1) (I). wherein briefly, E represents boron or aluminium, X is an aryl group and Y is -Ar'EAX,. These compounds are used as catalyst for hydrosilylation reaction, crosslinking of polymers, or ester deprotection reactions as photo Lewis acid generator (PhLAG).
