191-28-6Relevant articles and documents
A highly selective synthesis of 1,1'-Bi-2-naphthol by oxidative coupling of naphthol on mesoporous Fe,Cu/MCM-41 aluminosilicates
Armengol, Elvira,Corma, Avelino,Garcia, Hermenegildo,Primo, Jaime
, p. 1915 - 1920 (1999)
The oxidative coupling of 2-naphtol to 2,2'-dihydroxy-1,1'-binaphthyl (binaphthol) by air or oxygen has been carried out in the presence of Cu2+- and Fe3+-doped MCM-41 aluminosilicate as catalyst. Fe-exchanged MCM-41 was found to be a very efficient catalyst; excellent mass balances (> 95%) with almost total conversion and selectivity to binaphthol were achieved. The same reaction has also been carried out on Cu2+- and Fe3+-Y zeolites. Taking into account the relative dimensions of binaphthol and the catalyst pores, molecular modeling predicts that binaphthol can be accommodated inside the zeolite Y supercages (1.3 nm), but it cannot diffuse outside the zeolite cavities through the smaller pore apertures (0.74 nm). This prediction has been confirmed by dissolving a Y zeolite after the reaction, whereby unextractable binaphthol entrapped within the cavities was recovered. Variable amounts of two secondary by-products have also been detected, and their structure assigned to (2,8');(8,2')-dioxo-1,1'-binaphthyl and bisnaphthofuran based on analytical and spectroscopic data. Their percentage is particularly high when alumina-supported CuSO4 is used as the catalyst.
A peri-Xanthenoxanthene Centered Columnar-Stacking Organic Semiconductor for Efficient, Photothermally Stable Perovskite Solar Cells
Xu, Niansheng,Li, Yang,Wu, Ruihan,Zhu, Rui,Zhang, Jidong,Zakeeruddin, Shaik M.,Li, Hanying,Li, Ze-Sheng,Gr?tzel, Michael,Wang, Peng
, p. 945 - 948 (2019)
Modulating the structure and property of hole-transporting organic semiconductors is of paramount importance for high-efficiency and stable perovskite solar cells (PSCs). This work reports a low-cost peri-xanthenoxanthene based small-molecule P1, which is
Tandem Living Insertion and Controlled Radical Polymerization for Polyolefin–Polyvinyl Block Copolymers
Dau, Huong,Harth, Eva,Keyes, Anthony,Matyjaszewski, Krzysztof
supporting information, (2022/01/19)
Practical synthesis of polyolefin–polyvinyl block copolymers remains a challenge for transition-metal catalyzed polymerizations. Common approaches functionalize polyolefins for post-radical polymerization via insertion methods, yet sacrifice the livingness of the olefin polymerization. This work identifies an orthogonal radical/spin coupling technique which affords tandem living insertion and controlled radical polymerization. The broad tolerance of this coupling technique has been demonstrated for diverse radical/spin traps such as 2,2,5-trimethyl-4-phenyl-3-azahexane-3-nitroxide (TIPNO), 1-oxyl-(2,2,6,6-tetramethylpiperidine) -4-yl-α-bromoisobutyrate (TEMPO-Br), and N-tert-butyl-α-phenylnitrone (PBN). Subsequent controlled radical polymerization is demonstrated with nitroxide-mediated polymerization (NMP) and atom transfer radical polymerization (ATRP), yielding polyolefin–polyvinyl di- and triblock copolymers (?1.3) with acrylic, vinylic and styrenic segments. These findings highlight radical trapping as an approach to expand the scope of polyolefin-functionalization techniques to access polyolefin macroinitiators.
Preparation method of reactive fluorescent probe for rapid hydrazine detection
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Paragraph 0032, (2021/11/06)
The invention discloses a preparation method of a reactive fluorescent probe for rapid hydrazine detection, and relates to the field of fluorescent probes. The method comprises the steps: adding powdery 2-naphthol into an aqueous solution of FeCl3.6H2O to
