نتایج جستجو برای: ring opening of epoxides
تعداد نتایج: 21178628 فیلتر نتایج به سال:
the effect of the presence of perforations on he stresses of a plate is a problem which is of great interest in structural design and in the mathemattical theory of elasticity. among the many hole patterns that are likely to require consideration is the ring of equally spaced circular holes. the present worke investigates stress & strain analysis of a thin isotropic circular plate containing a ...
?-Hydroxy hydroperoxides (?-hydroperoxy alcohols) are interesting chemical platforms, notably for the preparation of 1,2,4-trioxanes, that key features numerous bioactive products such as artemisinin. In this review, main synthetic methods to prepare ?-hydroxy presented, photooxidation allylic alcohols with singlet oxygen and ring-opening epoxides H2O2. The applications also detailed, including...
We report an effective strategy for the synthesis of semi-crystalline block copolyethers with well-defined architecture and stereochemistry. As an exemplary system, triblock copolymers containing either atactic (racemic) or isotactic (R or S) poly(propylene oxide) end blocks with a central poly(ethylene oxide) mid-block were prepared by anionic ring-opening procedures. Stereochemical control wa...
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