Synthetic Route of 33282-15-4, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33282-15-4, Name is 5-(4-Hydroxyphenyl)isoxazole-3-carboxylic acid, molecular formula is C10H7NO4. In a Article，once mentioned of 33282-15-4
A novel cycloaddition reaction of alpha-diazo-gamma-amido ketones catalyzed by rhodium(II) acetate. Scope and mechanistic details of the process
alpha-Diazo ketones containing an amido group in the gamma-position have been found to underdo a novel rhodium(II)-catalyzed cycloaddition reaction. Intramolecular cyclization of the keto carbenoid onto the oxygen atom of the amide group generates a carbonyl ylide dipole as a transient species. This highly stabilized dipole does not readily undergo 1,3-dipolar cycloaddition but ruther transfers a proton to produce a cyclic ketene N,O-acetal. The ketene acetale is unstable to moisture and upon standing is readily hydrolyzed to a gamma-keto-delta-lactone and an amine. In the absence of any significant amount of water, the ketene N,O-acetal undergoes conjugate addition with the activated ?-bond of the dipolarophile to give a zwitterion intermediate. The anionic portion of the zwitterion adds to the neighboring carbonyl group. This is followed by epoxide ring formation with charge dissipation leading to an amido-substituted spiro cyclopentenyl epoxide. In certain cases a hydroxyl lactone was also isolated and its formation can be attributed to the competitive hydrolysis of the zwitterionic intermediate. The Rh(II)-catalyzed reaction of the diazo ketoamide derived from N-benzylpiperidone with DMAD afforded two different types of cyloadducts. In addition to the spiro cyclopentenyl epoxide, a product derived from trapping of the carbonyl ylide dipole was also obtained, thereby providing additional support for the proposed mechanism.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Synthetic Route of 33282-15-4. In my other articles, you can also check out more blogs about 33282-15-4
Reference：
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem