Summary
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1.
The dehyration of α,α-dimethylcyclopropanemethanol over acidic catalysts goes considerably more readily than the opening of the cyclopropane ring of the 2-cyclopropylpropene formed. Over alumina and calcium phosphate almost pure 2-cyclopropylpropene is obtained in yields of 60 and 78% respectively.
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2.
The 2-cyclopropylpropene formed by the dehydration of the alcohol is isomerized into cis-2-methyl-1,3-pentadiene and 2-methyl-1,4-pentadiene. The latter is converted into cis-2-methyl-1,3-pentadiene, which is further isomerized into the trans form.
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Freidlin, L.K., Sharf, V.Z., Abidov, M.A. et al. Dehydration of α,α-dimethylcyclopropanemethanol and accompanying transformations of the hydrocarbons formed over acidic catalysts. Russ Chem Bull 12, 1673–1676 (1963). https://doi.org/10.1007/BF00845799
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DOI: https://doi.org/10.1007/BF00845799