Das Maitra - Cryptanalysis of Optimal Differential Energy by Tanmoy Kanti Das and Subhamoy Maitra

By Tanmoy Kanti Das and Subhamoy Maitra

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By Tanmoy Kanti Das and Subhamoy Maitra

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Additional info for Das Maitra - Cryptanalysis of Optimal Differential Energy Watermarking (DEW) and a Modified Robust Scheme

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Control of the sense of HBr addition to a dissymetr ic C=C double bond). iii) Stereoselectivity(preferential formation of either one diastereomer or one enantiomer). It is also interesting to discover reactions which open new synthetic schemes which can apply to processes or academic works. The traditional organic synthesis has often used auxiliaries based on alkali metals. A large variety of reagents or catalysts now takes advantage of introducing a transition-metal either in a reagent or a catalyst (1,2).

Bonding characteristics: The f_orbitals do not seem to contributesignificantly to bonding. However these orbitals (filled or empty) should be able to modulate some electronic properties of the metal center. The coordination number around a lanthanide can be very high (up to 12),with various stereochemistries dictated by electrostatic bonding and ligand repulsions. The high coordination numbers and chelate formation should find some applications for controling organic reactions. g. La(III), are considered as hard acids in the HSAB classification of Pearson (7), located between Sr (II) and Ti(IV).

By the use of l3 C labelled methane it could be shown that the first step in the substitution reaction is the following exchange reaction in which a four-centered transition state is suggested (88): Ln = Y, Lu; R = H, CHg 40 H. SCHUMANN The latest investigations show, that (CsMe~)2ScCH3 also possesses the ability to activate methane. The "agostic" methyl group shall De the active center (58): ~H ~c~-), ~H The reaction of (CsHs)zLu-t-C 4 Hg (THF) wit CO ~n THF, which yields an acyl complex, proves that even CO is activated by organolanthanoides (161).

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