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5. Student Paper Contest on Information Security SIBINFO

Author

Stoukatch, Oleg, Shelupanov, Alexander, and Golovin, Evgeniy

Subjects
United States. Department of Defense -- Subsidiaries, divisions and units, United States. Department of Defense -- Conferences, meetings and seminars
Published
2004

8. Boride Coatings Structure and Properties, Produced by Atmospheric Electron-Beam Cladding

Author

Teplykh, Alexandr, Golkovskiy, Mikhail, Bataev, Anatoly, Drobyaz, Ekaterina, Veselov, Sergey, Golovin, Evgeniy, Bataev, Ivan A., and Nikulina, Aelita

Abstract

Structure, microhardness and fracture features of coatings produced by atmospheric electron-beam cladding of amorphous boron were investigated. The coatings were produced by cladding of one, two and three layers of powder. Produced coatings thickness is 550, 750 and 900 μm respectively. The peak level of microhardness is 14000…16000 MPa. By the means of XRD analysis it is stated that the main phases of strengthened layers are FeB and Fe2B borides and eutectic (α-Fe + Fe2B). The coatings after one layer cladding have non-uniform structure with microvolumes having lack of borides. Three-layered coatings are noted for their high brittleness. The best properties are presented by two-layer coatings.

Published
2011
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9. Convenient access to pyrrolidin-3-ylphosphonic acids and tetrahydro-2 H -pyran-3-ylphosphonates with multiple contiguous stereocenters from nonracemic adducts of a Ni(II)-catalyzed Michael reaction.

Author

Reznikov AN, Nikerov DS, Sibiryakova AE, Rybakov VB, Golovin EV, and Klimochkin YN

Abstract

A new synthetic strategy toward nonracemic phosphoryl-substituted pyrrolidines and tetrahydropyranes with three and five contiguous stereocenters is presented. Readily available β-keto phosphonates react with conjugated nitroolefins in the presence of a chiral Ni(II) complex to give nitro keto phosphonates with two stereocenters with excellent enantioselectivity and moderate to high diastereoselectivity. These products were used for a reductive cyclization leading to pyrrolidin-3-ylphosphonic acid and for reactions with aldehydes yielding tetrahydropyranylphosphonates as individual stereoisomers. These nonracemic heterocycles containing phosphoryl moieties are useful for designing new pharmacologically active compounds., (Copyright © 2020, Reznikov et al.; licensee Beilstein-Institut.)

Published
2020
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