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71.
Righi MC Pignedoli CA Di Felice R Bertoni CM Catellani A 《Physical review letters》2003,91(13):136101
We present first-principle calculations on the initial stages of SiC homoepitaxial growth on the beta-SiC(111)-(sqrt[3]xsqrt[3]) surface. We show that the nonstoichiometric reconstruction plays a relevant role in favoring the attainment of high-quality films. The motivation is twofold: On one hand, we find that the reconstruction controls the kinetics of adatom incorporation; on the other hand, we observe that the energy gain upon surface stability can induce the reorganization of the deposited material into a crystalline structure, thus revealing that a surface-driven mechanism is able to stabilize defect-free layer deposition on Si-rich surfaces. 相似文献
72.
α,β-Epoxy esters are opened by NaX (X = I, Br) in a regio and stereoselective fashion to β-hydroxy-α-halo esters, which represent suitable precursors of syn α-amino-β-hydroxy esters and β-hydroxy esters. 相似文献
73.
Marotta E Foresti E Marcelli T Peri F Righi P Scardovi N Rosini G 《Organic letters》2002,4(25):4451-4453
[reaction: see text] Cerium(III) chloride heptahydrate and sodium iodide in boiling acetonitrile promote cyclization of 3-hydroxyalkenoic acids esters giving 5-substituted tetrahydrofuranacetic acid esters and 6-substituted tetrahydropyranacetic acid esters in fair to good yield and with complete retention of the absolute configuration of the starting 3-hydroxy ester. 相似文献
74.
Rosini G Borzatta V Boschi F Candido G Marotta E Righi P 《Chemical communications (Cambridge, England)》2007,(26):2717-2719
The occurrence of p(1),n(1) salt when accompanied by substrate self-association can have profound effects on enantiomer separation processes of non-racemic mixtures, impeding the complete recovery of the major enantiomer through formation of an inescapable racemate cage. 相似文献
75.
Helio G. Bonacorso Rogério V. Lourega Fernando J. Righi Everton D. Deon Nilo Zanatta Marcos A. P. Martins 《Journal of heterocyclic chemistry》2008,45(6):1679-1686
76.
E. Muñoz W.K. Maser A.M. Benito M.T. Martínez G.F. de la Fuente A. Righi J.L. Sauvajol E. Anglaret Y. Maniette 《Applied Physics A: Materials Science & Processing》2000,70(2):145-151
The production of single-walled carbon nanotubes (SWNTs) using the cw CO2-laser ablation technique is reported. Different metals and metal concentrations in the carbon targets as well as different buffer gases and gas pressures have been used in order to study their influence on the formation of SWNTs. It is shown that the conditions near the evaporation zone, i.e. especially the local temperature environment induced by the laser radiation as well as the used metals play a key role in the formation process of SWNTs. Employing a very simple experimental setup the cw CO2-laser ablation technique easily provides the environment favorable for the growth of high quality SWNT material under a wide range of experimental conditions. 相似文献
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Starting from 2,3-aziridine alcohols, a novel and versatile preparation of optically active amino polyol was achieved using a simple strategy with few purification steps and a good overall yield. 相似文献