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The number of alkenes formed when 3-methyl-butan-2-ol is dehydrated with conc H2SO4 at 170°Сis
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Contents Home Bookshelves Organic Chemistry Supplemental Modules (Organic Chemistry) Alcohols Reactivity of Alcohols Expand/collapse global location
Dehydrating Alcohols to Make Alkenes
the dehydration of alcohols in the lab to make alkenes—for example, dehydrating ethanol to produce ethene.
The dehydration of ethanol to give ethene
This is a simple method of making gaseous alkenes such as ethene. If ethanol vapor is passed over heated aluminum oxide powder, the ethanol is essentially cracked to yield ethene and water vapor.
To produce a few test tubes of ethene, the following apparatus can be used:
This system can be scaled up by boiling ethanol in a flask and passing the vapor over aluminum oxide that is heated in a long tube.