1483-74-5Relevant academic research and scientific papers
Rhodium-Catalyzed Arylative Transformations of Propargylic Diols: Dual Role of the Rhodium Catalyst
Xing, Junhao,Zhu, Yong,Lin, Xiao,Liu, Na,Shen, Yue,Lu, Tao,Dou, Xiaowei
, p. 1595 - 1599 (2018)
Controllable synthesis of a variety of allenic alcohols and 2,5-dihydrofurans by rhodium(I)-catalyzed arylative transformations of propargylic diols is reported. The hydroxorhodium catalyst was found to play dual role: it catalyzed the arylation/dehydroxylation reaction of propargylic diols to afford allenic alcohols, and besides, it could convert to a cationic rhodium species in situ, which catalyzed the intramolecular hydroalkoxylation of allenic alcohols to form dihydrofurans. Remarkably, generation of the cationic rhodium species is dependent on the arylboron reagent used. Thus, the controllable synthesis is achieved by simply changing the arylboron reagent. (Figure presented.).
Direct Exploitation of the Ethynyl Moiety in Calcium Carbide Through Sealed Ball Milling
Hosseini, Abolfazl,Schreiner, Peter R.
, p. 4339 - 4346 (2020/07/04)
Ball milling of calcium carbide (CaC2) enables the reaction of its ethynyl moiety with organic electrophiles. This was realized simply by co-milling CaC2 with organic substrates in a sealed jar without the need for an additive or a catalyst. Various ketones including those bearing α-hydrogens were ethynylated in good yields at short reaction times. Aryl halides are also amenable substrates for this protocol as they furnish aryl ethynes through a benzyne intermediate. This method offers a practical and cheap alternative to the established procedures for introducing ethynyl functionalities.
Mechanosynthesis of Odd-Numbered Tetraaryl[n]cumulenes
Ardila-Fierro, Karen J.,Bolm, Carsten,Hernández, José G.
supporting information, p. 12945 - 12949 (2019/08/01)
A mechanochemical synthesis of one-dimensional carbon allotrope carbyne model compounds, namely tetraaryl[n]cumulenes (n=3, 5) was realized. Central for the mechanosynthesis of the cumulenic carbon nanostructures were the development of a mechanochemical Favorskii alkynylation-type reaction and the implementation of a solvent-free, acid-free reductive elimination with tin(II) chloride by ball milling.
Synthesis of Polycyclic Spironaphthofuran Derivatives by Acid-Catalyzed Domino Reaction of 2-Naphthols with Tetraarylbut-2-yne-1,4-diols
Sousa, Céu M.,Berthet, Jerome,Delbaere, Stephanie,Coelho, Paulo J.
, p. 3291 - 3297 (2018/07/13)
The acid-catalyzed condensation of 2-naphthols with tetraphenylbut-2-yne-1,4-diols affords a mixture of spiro[indene-1,1′-naphthofurans] and dinaphthofurans through a cascade of intramolecular reactions, whereas using the more reactive thienyltriphenylbut
Colour switching with photochromic vinylidene-naphthofurans
Costa, Diogo,Sousa, Céu M.,Coelho, Paulo J.
, p. 7372 - 7379 (2018/11/10)
A series of novel photochromic vinylidene-naphthofurans with extended conjugation, and a free hydroxyl function, were easily prepared using the Suzuki reaction. After silanization, these dyes were embedded in ormosil matrices affording solid and transpare
A Four-Step Synthesis of Substituted 5,11-Dicyano-6,12-diaryltetracenes with Enhanced Stability and High Fluorescence Emission
Kerisit, Nicolas,Gawel, Przemyslaw,Levandowski, Brian,Yang, Yun-Fang,García-López, Víctor,Trapp, Nils,Ruhlmann, Laurent,Boudon, Corinne,Houk, Kendall N.,Diederich, Fran?ois
supporting information, p. 159 - 168 (2017/11/21)
A four-step synthesis of substituted 5,11-dicyano-6,12-diaryltetracenes was developed, starting from readily available para-substituted benzophenones. The key step of this straightforward route is the complex cascade reaction between tetraaryl[3]cumulenes
Acid-catalyzed domino reactions of tetraarylbut-2-yne-1,4-diols. Synthesis of conjugated indenes and inden-2-ones
Sousa, Céu M.,Berthet, Jerome,Delbaere, Stephanie,Coelho, Paulo J.
, p. 5781 - 5786 (2014/07/08)
The reaction of tetraarylbut-2-yne-1,4-diols with electron-rich aromatic compounds at room temperature, under p-TsOH catalysis, affords substituted polycyclic aromatic indene derivatives through a domino reaction involving the formation of a cationic allenylium intermediate. This species can undergo a series of competitive intramolecular cascade reactions, leading to a conjugated inden-2-one. This simple method allows the efficient synthesis of substituted indenes and inden-2-ones, in two steps, from aromatic ketones.
Synthesis of 1-vinylidene-naphthofurans: A Thermally reversible photochromic system that colors only when adsorbed on silica gel
Sousa, Ceu M.,Berthet, Jerome,Delbaere, Stephanie,Coelho, Paulo J.
, p. 6956 - 6961 (2013/08/23)
A set of new 1-vinylidene-1,2-dihydro-naphtho[2,1-b]furans were unexpectedly obtained in the reaction of 2-naphthol with readily available 1,1,4,4-tetraarylbut-2-yne-1,4-diols. Surprisingly, when adsorbed in silica gel, these compounds exhibit photochromism at room temperature, whereas not in solution and in the solid state. UV or sunlight irradiation leads, in a few seconds, to the formation of intense pink/violet to green colors that bleach completely in a few minutes in the dark. These new compounds also exhibit reversible acidochromic properties in solution: addition of TFA leads to the opening of the furan ring and addition of a proton to the allene function, leading to a conjugated and violet tertiary carbocation that returned immediately to the uncolored allenic structure upon addition of a weak base.
SLIME REMOVER AND SLIME PREVENTING/REMOVING AGENT
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, (2008/06/13)
A drainage slime remover capable of spreading a solution of a solid over slime generated wall surface portions, comprising a solid containing a microorganism growth retarding substance and a container which has a shape for permitting the installation thereof at the inlet or upper portion of a drain outlet and stores the solid characterized in that the container has drain flow-in holes having an opening capable of controlling a drain flow-in amount and provided in the upper surface or the upper side portion of the container and solution flow-out holes having an opening capable of controlling a flow-out amount of a solid solution and provided in the bottom or the lower side portion of the container or additionally in the side surface thereof, and a slime preventing/removing agent which can remove slime from portions such as kitchen sinks and bathroom drain outlets where slime is grown by metabolites such as miscellaneous germs and mildews and which can prevent the occurrence of slime safely and for an extended period of time.
Electron transfer and contact ion pair formation, 45 [1, 2] structural changes on single electron reduction of tetraphenylbutatriene to its radical anion and on twofold deprotonation of tetraphenylbutyne-2 to the tetraphenylbutatriene dianion
Bock,Arad,Naether,Goebel,John,Baur
, p. 1381 - 1390 (2007/10/03)
Tetraphenylbutatriene is reduced under aprotic conditions to its ESR/ENDOR-spectroscopically characterized radical anion and to its dianion, with both electron transfers quasi-reversible according to cyclovoltammetric measurements. The alkali cation salts
