Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps. 40191-32-0, Name is Tetrahydro-2H-pyran-4-carbonyl chloride, molecular formula is C6H9ClO2. In a Article，once mentioned of 40191-32-0, Synthetic Route of 40191-32-0
A series of 1,2,3,4,6,7,8,12b-octahydropyrazino<2,1-a><2>benzazepine derivatives was prepared and the cestocidal activity of the compounds evaluated in an in vitro Taenia crassiceps screen.Many of these derivatives proved to be highly active, and 2-(cyclohexylcarbonyl)-4-oxo-1,2,3,4,6,7,8,12b-octahydropyrazino<2,1-a><2>benzazepine, epsiprantel (BAN) (22), was selected for further development.The structure-activity relationships are discussed.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics