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7790-86-5Relevant academic research and scientific papers
Oxa-adamantyl cannabinoids
Ho, Thanh C.,Tius, Marcus A.,Nikas, Spyros P.,Tran, Ngan K.,Tong, Fei,Zhou, Han,Zvonok, Nikolai,Makriyannis, Alexandros
supporting information, (2021/03/14)
As a continuation of earlier work on classical cannabinoids bearing bulky side chains we report here the design, synthesis, and biological evaluation of 3′-functionalized oxa-adamantyl cannabinoids as a novel class of cannabinergic ligands. Key synthetic steps involve nucleophilic addition/transannular cyclization of aryllithium to epoxyketone in the presence of cerium chloride and stereoselective construction of the tricyclic cannabinoid nucleus. The synthesis of the oxa-adamantyl cannabinoids is convenient, and amenable to scale up allowing the preparation of these analogs in sufficient quantities for detailed in vitro evaluation. The novel oxa-adamantyl cannabinoids reported here were found to be high affinity ligands for the CB1 and CB2 cannabinoid receptors. In the cyclase assay these compounds were found to behave as potent and efficacious CB1 receptor agonists. Isothiocyanate analog AM10504 is capable of irreversibly labeling both the CB1 and CB2 receptors.
The morphology evolution, tunable down-conversion luminescence, and energy transfer of [CaY]F2crystals doped with Li+/Ce3+/Tb3+
Hu, Shanshan,Jiang, Li,Mao, Yini,Wang, Zhiyi,Yang, Jun,Ye, Rui
, p. 15433 - 15442 (2020/11/18)
Octahedral [CaY]F2 crystals with an average particle size of 1 μm were synthesized via a mild one-step hydrothermal route without employing any surfactants. Various morphologies, including cubes, truncated cubes, truncated octahedrons, and spheres, were achieved via manipulating the amount of EDTA used, and a possible growth mechanism was proposed based on the surface energies of different crystal planes and the influence of the surfactant. XRD, SEM, EDS, TEM, HRTEM, and PL analysis were used to characterize the products. The effects of the morphologies and Li+ doping concentrations on the luminescence intensities of the [CaY]F2:Ce3+/Tb3+ phosphors were explored, and the strongest luminescence intensity is obtained when the sample is cubic with (100) crystal faces and the doping concentration of Li+ is 0.25 mol%. Additionally, multicolor emission (blue → aquamarine blue → green) was obtained from [CaY]F2:Ce3+/Tb3+ phosphors via adjusting the doping concentration of Tb3+, which resulted from the Ce3+ → Tb3+ energy transfer behavior; the energy transfer here happened through a dipole-dipole mechanism. This work may result in the as-synthesized phosphors having great application potential in many optoelectronic device fields, such as in displays and multicolor lighting.
Thermodynamic stability of RECl3·xH2O (RE = Ce, Pr) determined by dynamic transpiration technique
Sahoo,Mishra,Kumar, Raj,Kain, Vivekanand
, p. 1183 - 1193 (2019/07/17)
In the present study, decomposition mechanism of CeCl3·xH2O(s) and PrCl3·xH2O(s) was investigated using thermogravimetry, differential thermal analysis and evolved gas analysis techniques. Intermediate products formed in the dehydration of RE (Ce, Pr) Cl3·xH2O(s) were characterized by X-ray diffraction analyses. Thermodynamic stability of the RECl3·xH2O(s) and their intermediate products has been determined from the vapor pressure of water measured over the compounds employing dynamic transpiration technique.
Highly-selective recognition of latent fingermarks by La-sensitized Ce nanocomposites: Via electrostatic binding
Peng, Di,Huang, Mengjun,Xiao, Yaruo,Zhang, Yuyan,Lei, Li,Zhu, Jiang
supporting information, p. 10579 - 10582 (2019/09/12)
Herein, a series of binuclear (Ce,La) nanocomposite fluorescent powders was elaborately designed for highly-selective recognition of latent fingermarks by the powder dusting method, which were proved to interact with fingermark residues via electrostatic binding without any damage to touch-DNA.
Two Series of New Volatile Rare-Earth Metal Tris(guanidinates) and Tris(amidinates)
Tutacz, Peter,Harmgarth, Nicole,Z?rner, Florian,Liebing, Phil,Hilfert, Liane,Engelhardt, Felix,Busse, Sabine,Edelmann, Frank T.
, p. 1653 - 1659 (2018/10/31)
Two series of new volatile, homoleptic lanthanide(III) tris(guanidinate) and tris(amidinate) complexes were synthesized and fully characterized. Treatment of anhydrous rare-earth metal(III) chlorides, LnCl3, with three equiv. of the aziridine-derived lithium guanidinate Li[c-C2H4NC(NiPr)2] (3) afforded the new homoleptic tris(guanidinate) complexes [c-C2H4NC(NiPr)2]3Ln (4) (Ln = Sc, Pr, Nd, Sm, Eu, Ho, Tm) in good yields (68–80 %). In a similar manner, the homoleptic tris(amidinate) complexes [iPrC(NiPr)2]3Ln (6) Ln = Sc, Ce, Pr, Nd, Tb, Dy, Er, Yb) were prepared from LnCl3 and the all-isopropyl-substituted lithium amidinate Li[iPrC(NiPr)2] (5) in a molar ratio of 1:3. Variable-temperature 1H NMR studies of the paramagnetic derivatives 4Pr–4Tm revealed Curie-type behavior. 1H NMR spectroscopic data of complexes 6 indicated severe steric crowding due to the presence of nine isopropyl groups in these molecules. The molecular and crystal structures of eight title compounds (4Sc, 4Pr, 4Nd, 4Sm, 4Eu, 4Ho, 4Tm, and 6Er) were determined through single-crystal X-ray diffraction studies. All complexes 4 exhibit similar molecular structures, comprising distorted octahedral molecular structures with small bite angles. Sublimation temperatures of 4 at 0.05 mbar were determined to be in the range between 151 °C (4Eu) and 194 °C (4Tm), whereas the complexes 6 sublime in the temperature range between 140 °C (6Sc) and 180 °C (6Ce), so that the use of these precursors in future ALD or CVD studies appears feasible.
PROCESS FOR THE PREPARATION OF SUBSTITUTED PHENOXYPHENYL ALCOHOLS
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Page/Page column 8-9, (2019/01/08)
The present invention relates to a process for the preparation of the compounds of formula (II) using a lanthanoid salt.
Refractive indices and molar refractivities of molten rare-earth trichlorides and their mixtures with alkali chlorides
Kochedykov, Victor A.,Khokhlov, Vladimir A.
, p. 44 - 51 (2017/11/10)
New experimental data on the refractive indices and molar refractivities of molten cerium, neodymium, samarium, and gadolinium trichlorides and CeCl3-ACl, SmCl3-ACl, Gd3Cl-ACl (A = Na, 0.5Na-0.5K, K, and Cs) mixtures depending on the temperature and composition are reported. It is shown that the relative deviations of the molar refractivity of mixtures from their magnitudes inherent to the hypothetic ideal solutions increase as the radii of alkali metal cations rises. The difference in variation of the Ln3+-ions electron polarizability with the atomic number or ionic radius is revealed for cerium and yttrium subgroups of the lanthanide row.
Lanthanide-doped Sr2ScF7 nanocrystals: controllable hydrothermal synthesis, the growth mechanism and tunable up/down conversion luminescence properties
Zhao, Bei,Shen, Dingyi,Yang, Jun,Hu, Shanshan,Zhou, Xianju,Tang, Jianfeng
, p. 3264 - 3275 (2017/04/06)
Sr2ScF7:Ln3+ (Ln = Ce, Tb, Eu, Sm, Dy, Er, Tm, Ho and Yb) nanocrystals were firstly synthesized via a one-step hydrothermal route without employing any surfactants. The shape and size of the Sr2ScF7 nanocrystals could be readily tuned from nanorods with 120 nm length and 50 nm width to nanoparticles with a uniform diameter of 15 nm by doping 30% Ln3+ with a larger ionic radius. Furthermore, the influence of pH values, F? sources and different surfactants on the sizes and morphologies (including nanorods, quadrangular microplates, cubes and polyhedrons) of the as-prepared products was systematically investigated and the possible formation mechanism for the products has been proposed. The XRD, SEM, EDS, PL analysis and decay lifetimes were used to characterize the products. For DC photoluminescence, the Sr2ScF7:Ln3+ nanocrystals show the characteristic f-f transitions with emission colors of bluish violet (Ce3+, Tm3+), green (Tb3+, Er3+, Ho3+), blue (Dy3+) and orange (Eu3+, Sm3+) respectively. Under single wavelength 980 nm excitation, the blue UC emissions of Sr2ScF7:Yb3+,Tm3+ nanocrystals at 474 nm due to the 1G4 → 3H6 transition of Tm3+, the green UC emissions of Sr2ScF7:Er3+ nanocrystals at 522/544 nm assigned to the 2H11/2 → 4I15/2/4S3/2 → 4I15/2 transitions and the red UC emissions of Sr2ScF7:Yb3+,Er3+ at 660 nm from 4F9/2 → 4I15/2 transition of Er3+ were observed. Based on the generation of red, green, and blue emissions, the Sr2ScF7:Yb3+,Er3+,Tm3+ nanocrystals could produce multicolor, particularly in the white region (0.320, 0.330) by controlling the doping concentration of Tm3+ in the Sr2ScF7:Yb3+,Er3+,Tm3+ nanocrystals. Controlling the doping concentration of Tm3+ is an effective way of modulating the luminescence properties of Sr2ScF7:Ln3+ by controlling its size and morphology. The as-synthesized phosphors might be potentially applied in the fields of color displays, light, photonics and biological imaging.
Refractive indices and molar refractivities of molten rare-earth trichlorides and their mixtures with alkali chlorides
Kochedykov, Victor A.,Khokhlov, Vladimir A.
, p. 44 - 51 (2017/12/02)
New experimental data on the refractive indices and molar refractivities of molten cerium, neodymium, samarium, and gadolinium trichlorides and CeCl3-ACl, SmCl3-ACl, Gd3Cl-ACl (A = Na, 0.5Na-0.5K, K, and Cs) mixtures depending on the temperature and composition are reported. It is shown that the relative deviations of the molar refractivity of mixtures from their magnitudes inherent to the hypothetic ideal solutions increase as the radii of alkali metal cations rises. The difference in variation of the Ln3+-ions electron polarizability with the atomic number or ionic radius is revealed for cerium and yttrium subgroups of the lanthanide row.
Stereoelectronic factors in bridgehead C-H bond insertion: Studies toward the total synthesis of maoecrystal v
Jansone-Popova, Santa,May, Jeremy A.
, p. 3734 - 3747 (2016/06/06)
A strategy for the total synthesis of maoecrystal V is presented. The key interior vicinal quaternary carbon centers will be formed via sequential bridgehead C-H bond insertion and enolate functionalization. Studies herein validate the C-H bond insertion as feasible in model studies, though there are significant effects on the selectivity for the bridgehead position from neighboring groups. Both inductive electron withdrawing elements and sterics play a role in deactivating that position, with the former having a greater effect. Forming the second quaternary carbon is possible via enolate acylation and alkylation. Lastly, an approach to synthesize the cyclohexenone ring of maoecrystal V is described.
