110492-52-9Relevant academic research and scientific papers
Trihalogen substituted triphenylethylene photochromic materials as well as synthesis method and application thereof
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Paragraph 0034; 0036; 0038; 0042-0044, (2018/09/08)
The invention discloses trihalogen substituted triphenylethylene photochromic materials as well as a synthesis method and an application thereof. The materials have the advantages that the photochromic response speed is ultrahigh, the synthesis steps as s
Controlled mono- and double-Heck reaction catalyzed by a dicarbene dipalladium complex
Li, Yunfei,Liu, Gang,Cao, Changsheng,Wang, Shuzhan,Li, Yuling,Pang, Guangsheng,Shi, Yanhui
, p. 6241 - 6250 (2013/07/27)
The phosphine-free mono- and double-Heck reaction of terminal olefins with electron-deficient and electron-rich aryl halides (iodides and bromides) is described. These reactions are catalyzed by the dicarbene dipalladium complex 1 by controlling the stoichiometry of the aryl halide and the olefine, the loading of the palladium catalyst, as well as using different base, and with or without additive. The procedure of double-Heck reaction allows β,β- diarylation and β,β′-diarylation of terminal olefins and affords trisubstituted olefins in good to excellent yields.
Palladium-catalyzed double arylations of terminal olefins in acetic acid
Xu, Daichao,Lu, Chunxin,Chen, Wanzhi
experimental part, p. 1466 - 1474 (2012/03/08)
A palladium-catalyzed Heck diarylation of terminal olefins under ligand-free conditions in acetic acid is described. This procedure allows double arylation of terminal olefins affording trisubstituted olefins in good to excellent yields. The methodology is applicable to the coupling of both electron-deficient and electron-rich aryl iodides leading to symmetrical and unsymmetrical β,β-diarylated alkenes.
FROM THIIRANES TO THIOCARBONYL S-SULFIDES; RECENT RESULTS
Huisgen, Rolf
, p. 63 - 94 (2007/10/02)
A novel nucleophilic catalysis for the desulfurization of thiiranes is described.Triphenylthiirane is quantitatively converted to triphenylethylene by some molpercent sodium thiophenoxide or other thiolates in DMSO at 35 deg C.A rapid initial reaction is retarded by the eliminated sulfur leading to a pseudo-first-order reaction under quasi-stationary conditions.The suggested mechanism is based on structure-rate relationships. - The thiolate-catalyzed reaction of cis-2,3-diphenylthiirane is exceptional in furnishing equimolar quantities of cis-stilbene and 3,4,6,7-tetraphenyl-1,2,5-trithiepane (2 diastereoisomers with bilateral symmetry); mechanistic implications - thiolate attack on sulfur or C-atom of thiirane - are discussed. - Desulfurization of 2,2-diphenylthiirane by thiobenzophenone or other thioketones gives access to thiocarbonyl S-sulfides ("thiosulfines") which are intercepted by 1,3-cycloadditions to activated acetylenes or to thiones.
