Articles about 42900-54-9

 "Ruthenium-Catalyzed Selective Hydrogenation of Epoxides to Secondary Alcohols Thiyagarajan, Subramanian,Gunanathan, Chidambaram supporting information, p. 9774 - 9778 (2019/12/02) A ruthenium(II)-catalyzed highly selective Markovnikov hydrogenation of terminal epoxides to secondary alcohols is reported. Diverse substitutions on the aryl ring of styrene oxides are tolerated. Benzylic, glycidyl, and aliphatic epoxides as well as diepoxides also underwent facile hydrogenation to provide secondary alcohols with exclusive selectivity. Metal-ligand cooperation-mediated ruthenium trans-dihydride formation and its reaction involving oxygen and the less substituted terminal carbon of the epoxide is envisaged for the origin of the observed selectivity." https://www.lookchem.com/CASDataBase_42900-54-9.htm

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1023-17-2 Syntheses, structures, and catalytic activity in Friedel–Crafts acylations of substituted tetramethylcyclopentadienyl molybdenum carbonyl complexes

Reactions of the substituted tetramethylcyclopentadienes [C 5 HMe 4 R] [R?=? t Bu, Ph, CH 2 CH 2 C(CH 3 ) 3 ] with Mo(CO) 3 (CH 3 CN) 3 in refluxing xylene gave a series of dinuclear molybdenum carbonyl complexes [(η 5 -C 5 Me 4 R)Mo(CO) 3 ] 2 [R?=? t Bu (1), Ph (2), CH 2 CH 2 C(CH 3 ) 3 (3)], [(η 5 -C 5 Me t Bu)Mo(μ-CO) 2 ] 2 (4)], and [(η 5 -C 5 Me 4 ) t Bu] 2 Mo 2 O 4 (μ-O) (5)], respectively. Complexes 1–5 were characterized by elemental analysis, IR, 1 H NMR, and 13 C NMR spectroscopy. In addition, their crystal structures were determined by X-ray crystal diffraction analysis. The catalytic activities of complexes 1–3 in Friedel–Crafts acylation in the presence of o-chloranil has also been investigated; the reactions were achieved under mild conditions to give the corresponding products in moderate yields. https://www.lookchem.com/CASDataBase_1023-17-2.htm
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7440-47-3 Influence of pulse plating on the crystal structure and orientation of chromium

Chromium deposits with various structures and orientations were prepared by pulse plating from a sulfate-catalyzed chromic acid solution and without formic acid addition. The influences of the puls duration, off-time, curent density, formic acid concentration, and plating time on the structure and orientation were studied by X-Ray diffraction and transmition electron microcsopy. https://www.lookchem.com/CASDataBase_7440-47-3.htm
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42399-49-5 Enantiomer associations in the crystal structures of racemic and (2S,3R)-(-)-3-hydroxy-2-(4-methoxyphenyl)-2,3-dihydro-1,5-benzothiazepin-4(5H)- one

The crystal structures of racemic and (2S,3R)-(-)-3-hydroxy-2-(4-methoxyphenyl)-2,3-dihydro-1,5-benzothiazepin-4(5H)- one (C 16 H 15 NO 3 S) have been determined in order to compare the interactions between molecules of the same and opposite chirality. The enantiomeric associations observed in these two crystal structures are analysed, relating the differences to those found in the equivalent diastereomers, (2R, 3R) and/or (2S, 3S). Single-crystal X-ray diffraction data were collected at low temperature with Cu Kα radiation (λ = 1.54184 A). Optically active: monoclinic, space group C2, with a = 24.726(3), b = 5.2426(5), c =12.0726(12) A, β - 112.979(9)°, V = 1440.8(5) A 3 , Z = 4, D x = 1.389 g cm -3 , μ = 20.35 cm-1, the refinement on 2918 observed reflections gave R=0.0271. Racemic: monoclinic, space group P2 1 /n, with a = 13.308(3), b = 4.8474(8), c = 22.130(4) A, β = 91.782(14), V= 1426.9(5) A 3 , Z=4, D x = 1.403 g cm -3 , μ= 20.54 cm -1 , refined to R = 0.0318 for 2753 observed ...
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