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. Related Products of 31608-22-7Related Products of 31608-22-7, , Name is 2-(4-Bromobutoxy)tetrahydro-2H-pyran, molecular formula is C9H17BrO2. In a patent, introducing its new discovery.
A series of 5-alkenyl and 6-alkenyl aldehydes bearing aryl and ester functionality on the alkene and with and without 1,3-dioxolane substitution at the 3-position has been prepared.The N-methyl and N-benzyl nitrones derived by the condensation of the aldehydes with the corresponding hydroxylamines undergo intramolecular 1,3-dipolar cycloaddition on heating (or at room temperature in two instances) to give either bridged or fused isoxazolidines depending on the regiochemistry of the cycloaddition reaction.The 6-alkenyl nitrones give fused products in all cases except those bearing an aryl group at C-6, which give bridged products.All of the 5-alkenyl nitrones prepared in this study cyclized to afford fused isoxazolidines.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics