نتایج جستجو برای: samarium

تعداد نتایج: 1033  

Journal: :Journal of Phase Equilibria 2001

Journal: :Fizika i tehnika poluprovodnikov 2022

We study crystallographically textured thermoelectric materials with electronic conductivity based on bismuth telluride doped samarium (Bi 2-x Sm x Te 2.7 Se 0.3 , where x=0, 0.05, 0.02, 0.05) obtained by the method of solvothermal synthesis and double pressing spark plasma sintering. The crystallographic texture was achieved sintering plate-like nanoparticles. texturing axis [001] coincided di...

2016
Xavier Just‐Baringo Jemma Clark Matthias J. Gutmann David J. Procter

Seven-membered lactones undergo selective SmI2 -H2 O-promoted radical cyclization to form substituted cyclooctanols. The products arise from an exo-mode of cyclization rather than the usual endo-attack employed in the few radical syntheses of cyclooctanes. The process is terminated by the quenching of a chiral benzylic samarium. A labeling experiment and neutron diffraction study have been used...

Journal: :The Journal of organic chemistry 2008
Jin-Hwan Kim Fei Huang Mellisa Ly Robert J Linhardt

C-linked neuraminic acid disaccharide was synthesized in a diastereoselective manner from a sulfone donor and aldehyde acceptor, which was protected as a propargyl ether, through a samarium-mediated coupling reaction. The resulting disaccharide has acetal and phenyl sulfide functional groups that can be easily converted into aldehyde and phenyl sulfone groups by photolysis and oxidation reactio...

Journal: :Chemical communications 2015
Pei-Qiang Huang Qi-Wei Lang Ai-E Wang Jian-Feng Zheng

We report the first one-pot reductive homocoupling reaction of secondary amides and cross-coupling reaction of secondary amides with ketones to give secondary vicinal diamines and amino alcohols. This method relies on the direct generation of α-amino carbon radicals from secondary amides by activation with trifluoromethanesulfonic anhydride, partial reduction with triethylsilane and samarium di...

Journal: :The Journal of organic chemistry 2005
Jose Luis Chiara Angela García Gabriella Cristóbal-Lumbroso

[reaction: see text] The intramolecular 1,6-ketone/imide reductive coupling promoted by samarium diiodide competes favorably with an alternative 1,5-ketone/oxime ether coupling in a keto-oxime substrate derived from D-glucosamine N-protected with a phthalimido group. This pinacol coupling reaction affords new homochiral alpha-hydroxylactam scaffolds that could be useful in diversity-oriented sy...

Journal: :The Journal of chemical physics 2004
Jozef Paulovic Laura Gagliardi John M Dyke Kimihiko Hirao

The Sm+O chemiionization reaction has been investigated theoretically using a method that allows for correlation and relativistic effects. Potential energy curves have been calculated for several electronic states of SmO and SmO+. Comparison with available spectroscopic and thermodynamic values for these species is reported and a mechanism for the chemiionization reaction Sm+O is proposed. The ...

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