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A chiral guanidinium ion is shown to catalyze enantioselective Claisen rearrangements of O-allyl beta-ketoesters in 78-87 % ee (see scheme). The pericyclic nature of the process allows products containing vicinal stereogenic centers to be accessed with both enantio- and diastereocontrol. Copyright
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 127956-11-0 is helpful to your research., Reference of 127956-11-0
Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics