نتایج جستجو برای: preparation of ethers
تعداد نتایج: 21171003 فیلتر نتایج به سال:
based on the latest records of typhlops vermicularis merrem, 1820 from iran, this species is distributed in the northern and southern regions of the country. in this study, new records of typhlops vermicularis are presented and it is shown that distribution range of this species is extended towards the eastern and western iran, and according to the new distribution map, it can be assumed that t...
A method previously developed for the regiospecific synthesis of polysubstituted indolines and indoles has been investigated for its utility in organic synthesis. The method relies on the regiospecific generation of zirconocene-stabilized benzyne complexes from N-allyl-2-bromoaniline derivatives. These complexes undergo an intramolecular olefin insertion to provide 5,5,6-tricyclic indoline zirc...
there are two major theories of measurement in psychometrics: classical test theory (ctt) and item-response theory (irt). despite its widespread and long use, ctt has a number of shortcomings, which make it problematic to be used for practical and theoretical purposes. irt tries to solve these shortcomings, and provide better and more dependable answers. one of the applications of irt is the as...
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