ring closure वाक्य
उदाहरण वाक्य
मोबाइल
- :Ring closure in sugars is a type of hemiacetal or hemiketal reaction, see also Furanose which is the 5-membered ring of which you speak .-- 32 " "'18 : 28, 6 November 2009 ( UTC)
- Stepwise mechanism from the s-" trans "-conformation with sequential extrusion of nitrogen to give the ketocarbene, which can either undergo 1, 2-alkyl shift to form the carbene or 4? electrocyclic ring closure to give an oxirene intermediate.
- The silyl protecting group is removed with hydrogen fluoride to alcohol "'14 "'and then activated as an mesyl leaving group by reaction with mesyl chloride in pyridine which enables the third ring closure to "'15 " '.
- Corroles can be prepared through organic synthesis by condensation reaction of a benzaldehyde with pyrrole in a water / methanol / hydrochloric acid mixture to an open-ring bilane ( or tetrapyrrane ) followed by oxidation and ring closure with " p "-chloranil:
- When the alkene is not symmetric, the major product depends on the nature of the alkene, and is consistent with initial formation of the more stable radical ( among the two carbons of the alkene ) followed by ring closure onto the more stable conformation of the intermediate.
- The A ring closure required two ketone groups for a pinacol coupling which were realized by oxidation of the C11 alcohol ( TPAP, NMO ) to ketone "'36 "'and Wacker oxidation of the allyl group to diketone "'37 " '.
- Ring closure is optimized for 5-and 6-membered ring products; smaller rings suffer from ring strain, while longer chains suffer from entropic effects ( the ends can't " find " each other ) .-- 32 " "'16 : 59, 18 March 2010 ( UTC)
- In Piancatelli's proposed mechanism, the formation of the carbocation due to a protonation-dehydration sequence results in the two hydroxy groups being " anti " allowing for the " trans "-4hydroxy-5-substituted-cyclopent-2-enone from a 4? electrocylization ring closure . center
- This rearrangement reaction takes place in several steps : "'A "'ring opening to the diketone, "'B "'bond rotation with formation of a favorable acetylacetone-like phenyl-ketone interaction and "'C "'hydrolysis of two methoxy groups and ring closure.
- The ring closure step may use a different-OH group than the one recreated by the opening step ( thus switching between pyranose and furanose forms ), or the new hemiacetal group created on C-1 may have the same or opposite handedness as the original one ( thus switching between the ? and ? forms ).
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