نتایج جستجو برای: Prototropic shift
تعداد نتایج: 136852 فیلتر نتایج به سال:
Structural properties, energies behavior and NBO analysis was performed for1-5 prototrophic shift endinelboran where substitutions like H, CH3 and CF3 that were placed on Benzene were investigated by usingDFT-B3LYP/6-311+G** level of theory. The Results show that, -BH2 shift doesn’t take place and a kind of[1,3] shift for borotrophic occured. In prototrophic shift, however, [1,5] transition eas...
A catalytic enantioselective vinylogous domino reaction has been achieved from ketone-derived benzylidene Meldrum's acid and ?-ketolactones to provide spirolactone dihydropyranones with more than 99% ee. An Auto Tandem Catalysis (ATC) process resulting dual complementary role of (DHQ)2PHAL organocatalyst resulted in a sequence involving an asymmetric formal (4+2) cycloaddition the subsequent ki...
Fisetin, a bioflavonoid, has important biological relevance. It exhibits intramolecular excited state proton transfer (ESIPT), analogous to the structurally similar flavonoids. The presence of multiple prototropic forms of fisetin was observed at various concentrations of different bile salt molecules. The presence of ground state fisetin anion (FA)(GS) (λ(ex) 418 nm; λ(em) 490 nm) in alcohols ...
Lanthanide(III) chelates of DOTA-tetraamide ligands have been an area of particular interest since the discovery that water exchange kinetics are dramatically affected by the switch from acetate to amide side-chain donors. More recently these chelates have attracted interest as potential PARACEST agents for use in MRI. In this paper we report the results of studies using chemical exchange satur...
امروزه ، استراتژی ها و روشهای مختلفی توسط مترجمان در زمینه ترجمه متون به کار گرفته می شود. یکی از این روشهای رایج، استفاده از شیفت ها است. مطالعه ی پیش رو کاربرد استراتژی شیفت ها در ترجمه بروشورهای تبلیغاتی مربوط به محصولات مراقبت شخصی از زبان انگلیسی به فارسی را بر اساس مدل کتفورد (1965) مورد بررسی قرار داده است. هدف این مطالعه بررسی میزان استفاده از این استراتژی از طریق مقایسه متون زبان مبدا ...
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