2181-42-2Relevant articles and documents
Trimethylsulfonium Lead Triiodide: An Air-Stable Hybrid Halide Perovskite
Kaltzoglou, Andreas,Stoumpos, Constantinos C.,Kontos, Athanassios G.,Manolis, Georgios K.,Papadopoulos, Kyriakos,Papadokostaki, Kyriaki G.,Psycharis, Vasilis,Tang, Chiu C.,Jung, Young-Kwang,Walsh, Aron,Kanatzidis, Mercouri G.,Falaras, Polycarpos
, p. 6302 - 6309 (2017)
We report on the synthesis, characterization, and optoelectronic properties of the novel trimethylsulfonium lead triiodide perovskite, (CH3)3SPbI3. At room temperature, the air-stable compound adopts a hexagonal crystal structure with a 1D network of face-sharing [PbI6] octahedra along the c axis. UV-vis reflectance spectroscopy on a pressed pellet revealed a band gap of 3.1 eV, in agreement with first-principles calculations, which show a small separation between direct and indirect band gaps. Electrical resistivity measurements on single crystals indicated that the compound behaves as a semiconductor. According to multi-temperature single-crystal X-ray diffraction, synchrotron powder X-ray diffraction, Raman spectroscopy, and differential scanning calorimetry, two fully reversible structural phase transitions occur at ?5 and ca. ?100 °C with reduction of the unit cell symmetry to monoclinic as temperature decreases. The role of the trimethylsulfonium cation regarding the chemical stability and optoelectronic properties of the new compound is discussed in comparison with APbI3 (A = Cs, methylammonium, and formamidinium cation), which are most commonly used in perovskite solar cells.
A Novel Synthesis of Methyltin Tri-iodide with Environmental Implications
Manders, William F.,Olson, Gregory J.,Brinckman, Frederick E.,Bellama, Jon M.
, p. 538 - 540 (1984)
Methyltin tri-iodide and methylsulphur species are produced by an unusual heterogeneous reaction between MeI and SnS in water at room temperature which may bear on ubiquitous occurrence of methylstannanes in the environment.
Synthesis and Biological Evaluation of Bromo- and Fluorodanicalipin A
Fischer, Stefan,Huwyler, Nikolas,Wolfrum, Susanne,Carreira, Erick M.
, p. 2555 - 2558 (2016)
We disclose the syntheses of (+)-bromodanicalipin A as well as (±)-fluorodanicalipin A. The relative configuration and ground-state conformation in solution of both molecules was secured by J-based configuration analysis which revealed that these are identical to natural danicalipin A. Furthermore, preliminary toxicological investigations suggest that the adverse effect of danicalipin A may be due to the lipophilicity of the halogens. Halologs: The syntheses of bromo- and fluorodanicalipin A are reported and the ground-state conformation was determined by J-based configuration analysis (see scheme, R=H). A preliminary comparative study of their toxicology suggests that the adverse effect arises from the lipophilicity of the halogens which counterbalance the polar C14 sulfate.
Reactions of (triethylstannylthioalkyl)trialkoxysilanes and (triethylstannylthioalkyl)trialkoxysilatranes with methyl iodide
Sorokin,Voronkov
, p. 2056 - 2060 (2008)
Reactions of (triethylstannylthioalkyl)trimethoxysilanes Et 3SnS(CH2)nSi(OMe)3 (n = 1, 2) and (triethylstannylthioalkyl)trialkoxysilatranes Et3Sn(CH2) n Sa [hereinafter Sa = Si(O
Synthesis, characterization and optoelectronic properties of chemically stable (CH3)3SPbI3?xBrx and (CH3)3SPbI3?xClx (x?=?0, 1, 2, 3) perovskites
Kaltzoglou, Andreas,Elsenety, Mohamed M.,Koutselas, Ioannis,Kontos, Athanassios G.,Papadopoulos, Kyriakos,Psycharis, Vassilis,Raptopoulou, Catherine P.,Perganti, Dorothea,Stergiopoulos, Thomas,Falaras, Polycarpos
, p. 67 - 73 (2018)
We report on the novel series of (CH3)3SPbI3?xBrx and (CH3)3SPbI3?xClx (x = 0, 1, 2, 3) perovskite compounds. X-ray diffraction analysis shows that the solid solutions of (CH3)3SPbI3?xBrx (x = 0, 1, 2, 3) and (CH3)3SPbI3?xClx (x = 0, 1, 2) crystallize in hexagonal symmetry (space group P63mc, No. 186) with 1D columns of face-sharing [PbX6] octahedra. (CH3)3SPbCl3 crystallizes in orthorhombic symmetry (space group Pnma, No. 62) forming 3D network of vertex- and face-sharing [PbCl6] octahedra. Optical and vibrational properties were investigated using UV–vis reflectance, photoluminescence and Raman spectroscopy at room temperature. The compounds show high chemical stability in ambient air at temperatures up to 80 °C and under solar simulator, in contrast to the hygroscopic CH3NH3PbI3 or CH(NH2)2PbI3 that are commonly used in perovskite solar cells. First principles theoretical ab initio and efficient semiempirical extended Hückel calculations were performed to evaluate the energy band gap values, whose results are in good agreement with the experimentally determined values.
Mechanochemical Synthesis of 1,2-Diketoindolizine Derivatives from Indolizines and Epoxides Using Piezoelectric Materials
Wang, Yumei,Zhang, Ziwu,Deng, Lichan,Lao, Tianfeng,Su, Zhengquan,Yu, Yue,Cao, Hua
supporting information, p. 7171 - 7176 (2021/09/14)
A simple and efficient mechanochemical-induced approach for the synthesis of 1,2-diketoindolizine derivatives has been developed. BaTiO3 was used as the piezoelectric material in this transformation. This method features no usage of solvent, simple experimental operation, scalable potential, and high conversion efficiency, which make it attractive and practical.
Method for preparing naproxen intermediate
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Paragraph 0095-0100, (2020/12/08)
A technical scheme of the invention provides a method for preparing a naproxen intermediate represented by a chemical structural formula I. Preparation reactions are as follows: 6-methoxy-2-acetonaphthone and trimethyl sulfonium hydrogen sulfate are subjected to an epoxidation reaction in the presence of alkali so as to prepare 2-(6-methoxynaphthyl)-1,2-epoxypropane, the 2-(6-methoxynaphthyl)-1,2-epoxypropane is subjected to catalyzed rearrangement through silica gel or FeCl3 and then reacts with hydroxylamine hydrochloride, thereby preparing an intermediate, i.e., 2-(6-methoxy-2-naphthyl)propyl oxime (I) in one step. Naproxen is prepared by employing a one-pot method through a key intermediate, i.e., 2-(6-methoxy-2-naphthyl)propyl oxime.
Stereoselective Cyclopropanation of (-)-Levoglucosenone Derivatives Using Sulfonium and Sulfoxonium Ylides
Ledingham, Edward T.,Merritt, Christopher J.,Sumby, Christopher J.,Taylor, Michelle K.,Greatrex, Ben W.
supporting information, p. 2652 - 2662 (2017/06/13)
The synthesis of tri- and tetrasubstituted cyclopropanes from 3-aryl-substituted levoglucosenones (LGO) has been developed. In contrast to the unstabilised ylide dimethylsulfonium methylide which gives epoxides from LGO via 1,2-addition, we have found that the soft nucleophile dimethylsulfoxonium methylide affords cyclopropanes in moderate yields from LGO and in excellent yields and stereoselectivity with 3-aryl LGO derivatives. The use of 1,1,3,3-tetramethylguanidine as base in DMSO to generate the ylide provided the best yields and shortest reaction times. Ester stabilised sulfonium ylides could also be used to generate tetrasubstituted cyclopropane derivatives. One of the products was converted into a cyclopropyl lactone via Baeyer-Villiger oxidation to demonstrate the utility of applying cyclopropanation chemistry to LGO. Georg Thieme Verlag Stuttgart.New York.
Preparation method of medetomidine and intermediate thereof
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Paragraph 0076; 0077; 0078; 0079, (2017/08/28)
The invention relates to a preparation method of 2-(2, 3-xylyl)-2-methyloxirane. The method is characterized in that the preparation process includes the following reaction shown as the specification, wherein Y is selected from Cl, Br, I, CH3SO4 or HSO4; alkali is selected from KOH, NaOH, LiOH, CsOH, K2CO3, Li2CO3, Cs2CO3, Na2CO3, EtONa, EtOK, (CH3)2CHONa, (CH3)2CHOK, (CH3)3CONa, (CH3)3COK, NH2Na or NH2K. The invention adopts the synthesis method using the 2-(2, 3-xylyl)-2-methyloxirane critical intermediate to prepare medetomidine.
ARYL-ALKYLAMINES AND HETEROARYL-ALKYLAMINES AS PROTEIN KINASE INHIBITORS
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Page/Page column 209-210, (2010/11/25)
The invention provides a compound of the formula (II): or a salt, solvate, tautomer or N-oxide thereof; wherein n is 0 or 1; one of Y1 and Y2 is CH and the other is selected from CH, CR8 and N; q is 0, 1 or 2 provided that q is 0 or 1 when Y1 or Y2 is CR8; R1 is an aryl or heteroaryl group of 5 to 10 ring members; R2a and R3a each are hydrogen, C1-4 hydrocarbyl or C1-4 acyl wherein the hydrocarbyl and acyl moieties are optionally substituted by fluorine, hydroxy, amino, methylamino, dimethylamino or methoxy; or NR2aR3a forms an imidazole group or a saturated monocyclic 4-7 membered heterocyclic group optionally containing a second heteroatom ring member selected from O and N; R18 is hydrogen or methyl; R19 is hydrogen or methyl; R24 is hydrogen or R24, R2a and the intervening nitrogen atom and carbon atoms together form an azetidine, pyrrolidine or piperidine ring; R25 is hydrogen or a C1-4 alkyl group wherein the C1-4 alkyl group is optionally substituted by hydroxy or amino provided that there are at least two carbon atoms between the hydroxy or amino group and the oxygen atom to which R25 is attached; and R4 and R5 each are hydrogen or a substituent as defined in the claims
