The ring opening step may be catalyzed by His99 and Asp270, and isomerization is likely a cis-enediol mechanism.
22.
Casuarictin is transformed into pedunculagin via loss of a gallate group, and further into castalagin via glucose pyranose ring opening.
23.
Torquoselectivity is also used to describe selective electrocyclic ring openings, in which different directions of rotation produce distinct structural isomers.
24.
Ring opening metathesis usually involves a strained alkene ( often a norbornene ) and the release of ring strain drives the reaction.
25.
Next, an oxygenation step follows by a ring opening reaction leads to " atrop "-abyssomicin C formation.
26.
Ring opening as a means of ring expansion can also be applied to larger systems to give access to even larger ring syscyclization.
27.
A 4n electron electrocyclic ring opening reaction can be considered to have 2 components the ?-system and the breaking ?-bond.
28.
In the total synthesis of rocaglamide, epoxidation of a vinyl alkoxyallenyl stannane likewise generates a pentadienyl cation via ring opening of the resultant epoxide.
29.
Enzymatic epoxidation of phenylalanine-derived diketopiperazine forms the arene oxide, which undergoes a 6? disrotatory ring opening electrocyclization reaction to produce the uncyclized oxepine.
30.
Phe-Aziridine-Me can then undergo a simple ring opening reaction to form dextroamphetamine and levoamphetamine ( the two active ingredients in Adderall ).
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