epoxidation वाक्य

उदाहरण वाक्य

1. They catalyze isomerisation, alkylation, and epoxidation, and are used in large scale industrial processes, including hydrocracking and fluid catalytic cracking.
2. The generic mechanism for nucleophilic epoxidation of an electron-deficient olefin indicates that the reaction proceeds through a resonance stabilized peroxide enolate intermediate.
3. In particular, if the starting ketone is chiral then the epoxide may be generated enantioselectively, this forms the basis of the Shi epoxidation.
4. 302x302pxThe enantiomeric success of this epoxidation is relatively high compared to metal catalysts, and generally results in a high enantiomeric excess exceeding 80 percent.
5. In the total synthesis of rocaglamide, epoxidation of a vinyl alkoxyallenyl stannane likewise generates a pentadienyl cation via ring opening of the resultant epoxide.
6. Enzymatic epoxidation of phenylalanine-derived diketopiperazine forms the arene oxide, which undergoes a 6? disrotatory ring opening electrocyclization reaction to produce the uncyclized oxepine.
7. In this reaction sequence a Jacobson epoxidation adds an epoxy group to a diene which serves as the leaving group in reaction with the pyrazole nucleophile.
8. Transition metal hypochlorites are generally unheard of, although hypochlorite will briefly coordinate to a Mn ( III )-salen complex during the Jacobsen epoxidation reaction.
9. Epoxidation of barrelene with oxone gives the trioxatrishomobarrelene which on rearrangement with boron trifluoride ( driving force : relief of strain energy ) converts into the trioxatrishomocubane:
10. Little success has occurred with the epoxidation of trans alkenes by manganese compounds but other salen coordination compounds, such as oxochromium complexes, can be used.