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From QCA (Quantum Cellular Automata) to Organocatalytic Reactions with Stabilized Carbenium Ions 下载免费PDF全文
Andrea Gualandi Luca Mengozzi Elisabetta Manoni Pier Giorgio Cozzi 《Chemical record (New York, N.Y.)》2016,16(3):1228-1243
What do quantum cellular automata (QCA), “on water” reactions, and SN1‐type organocatalytic transformations have in common? The link between these distant arguments is the practical access to useful intermediates and key products through the use of stabilized carbenium ions. Over 10 years, starting with a carbenium ion bearing a ferrocenyl group, to the 1,3‐benzodithiolylium carbenium ion, our group has exploited the use of these intermediates in useful and practical synthetic transformations. In particular, we have applied the use of carbenium ions to stereoselective organocatalytic alkylation reactions, showing a possible solution for the “holy grail of organocatalysis”. Examples of the use of these quite stabilized intermediates are now also considered in organometallic chemistry. On the other hand, the stable carbenium ions are also applied to tailored molecules adapted to quantum cellular automata, a new possible paradigm for computation. Carbenium ions are not a problem, they can be a/the solution!
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The experimental re-investigation of a reported synthesis of a macrocyclic pseudopeptide promoted by bis(tetrabutylammonium)terephthalate allowed us to elucidate the nature of the non-bonding interactions between the reagents and the template; while the involvement of aromatic-aromatic interactions could be ruled out, the relevance of the role of the carboxylate ion was confirmed. 相似文献
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The existence and uniqueness of solutions to the Euler equations for initial vorticity in BΓ∩Lp0∩Lp1 was proved by Misha Vishik, where BΓ is a borderline Besov space parameterized by the function Γ and 1<p0<2<p1. Vishik established short time existence and uniqueness when Γ(n)=O(logn) and global existence and uniqueness when . For initial vorticity in BΓ∩L2, we establish the vanishing viscosity limit in L2(R2) of solutions of the Navier-Stokes equations to a solution of the Euler equations in the plane, convergence being uniform over short time when Γ(n)=O(logn) and uniform over any finite time when Γ(n)=O(logκn), 0?κ<1, and we give a bound on the rate of convergence. This allows us to extend the class of initial vorticities for which both global existence and uniqueness of solutions to the Euler equations can be established to include BΓ∩L2 when Γ(n)=O(logκn) for 0<κ<1. 相似文献
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S. Cecchini M. Cozzi D. Di Ferdinando M. Errico F. Fabbri G. Giacomelli R. Giacomelli M. Giorgini A. Kumar J. McDonald G. Mandrioli S. Manzoor A. Margiotta E. Medinaceli L. Patrizii J. Pinfold V. Popa I. E. Qureshi O. Saavedra Z. Sahnoun G. Sirri M. Spurio V. Togo C. Valieri A. Velarde A. Zanini 《The European Physical Journal C - Particles and Fields》2008,57(3):525-533
The SLIM experiment at the Chacaltaya high altitude laboratory was sensitive to nuclearites and Q-balls which could be present
in the cosmic radiation as possible Dark Matter components. It was sensitive also to strangelets, i.e. small lumps of Strange
Quark Matter predicted at such altitudes by various phenomenological models. The analysis of 427 m2 of Nuclear Track Detectors exposed for 4.22 years showed no candidate event. New upper limits on the flux of downgoing nuclearites
and Q-balls at the 90% C.L. were established. The null result also restricts models for strangelets propagation through the
Earth atmosphere. 相似文献