NMR parameters, isomerism, and conformational analysis of 3-methyl-2-phenyl-5-(3-methyl-2-phenyl-3,4-dehydropiperid-6-yl)-pyridine

The configurational and conformational features of the trans and cis isomers of 3-methyl-2-phenyl-5-(3-methyl-2-phenyl-3,4-dehydropiperid-6-yl)pyridine, formed as by-products in the phenylation of β-picoline by phenyllithium, were established. The revealed stereospecificity of the 5JHH and 1JCH SSCCs may be utilized as an independent criterion in the conformational analysis of piperideine systems. © 1993 Plenum Publishing Corporation

Peculiarities of metal balls deformation by quasi-spherical shock waves

The paper presents results of experimental studies of metal balls deformation by quasi-spherical shock waves. With use of sequential increase of explosive layer thickness characterizing level of shock-wave loading for ball surface, we recorded various extents of ball : from saving of material continuity to fragmentation. Results of explosive loading of metals with different strength and plastic properties are discusse