The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1,3,5,7-Tetramethyl-6-phenyl-2,4,8-trioxa-6-phosphaadamantane, is researched, Molecular C16H21O3P, CAS is 97739-46-3, about Palladium-Catalyzed Carbonylative Cyclization of Terminal Alkynes and Anilines to 3-Substituted Maleimides, the main research direction is phenylmaleimide preparation; terminal alkyne aniline carbon monoxide palladium oxidative carbonylative cyclization.Application of 97739-46-3.
Palladium-catalyzed carbonylative synthesis of 3-substituted maleimides were discussed. By annulation of simple anilines with terminal alkynes under carbon monoxide pressure, the desired 3-substituted maleimides were obtained in 50-85% yields. Addnl., with the addition of phosphine ligand, maleic acid isoimide were obtained from the same substrates as well. With the presence of K2S2O8, the obtained maleic acid isoimide were transformed to the corresponding maleimide.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics