نتایج جستجو برای: substituent effects
تعداد نتایج: 1548409 فیلتر نتایج به سال:
Substituent effects on iminoboranes XBNH, HBNX and XBNX (X = H, CH3, NH2, OH, F) have been analyzed in the framework of the NBO, AIM and ELF approaches, using B3LYP/6-311++G(d,p) optimized geometries and electron densities. Boron-substituted derivatives, XBNH, are more stable than the corresponding nitrogen-substituted isomers HBNX, with the energy difference increasing as the electron withdraw...
A self-promoted glycosylation method for the stereoselective formation of β-glucosides from a substrate library glycosyl trichloroacetimidate donors and acceptors is presented. The simple two-component reaction takes place at elevated temperatures, without addition any additives or catalysts. After basic workup, N-glycosides were obtained in good yields with high β-selectivity hence this allows...
Recently we reported the preparation and properties of some 2-(2or · 3-furyl)benzothiazoles1• Like many other thiazoles2 , due to their weak basic character they can give quaternary salts. Comparing 2-(2-methyl-3-furyl)benzothiazoles with the 2-(5-methyl-2-furyl) analogue it was observed that the nucleophilicity (and basicity) of benzothiazole nitrogen is influenced by the position of the methy...
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