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Cycloalkanes are types of hydrocarbon compounds that have one or more rings of carbon atoms in the chemical structure of their molecules. Alkanes are types of organic hydrocarbon compounds that have only single chemical bonds in their chemical structure. Cycloalkanes consist of only carbon (C) and hydrogen (H) atoms and are saturated because there are no multiple C-C bonds to hydrogenate (add more hydrogen to). A general chemical formula for cycloalkanes would be CnH2(n+1-g) where n = number of C atoms and g= number of rings in the molecule. Cycloalkanes with a single ring are named analogously to their normal alkane counterpart of the same carbon count: cyclopropane, cyclobutane, cyclopentane, cyclohexane, etc. The larger cycloalkanes, with greater than 20 carbon atoms are typically called cycloparaffins.
Cyclohexane Preparation
1.Freunds Method
In this method 1, 3 to 1,6-dihalo alkanes react with Na metal ‘or’ Zn metal to form corresponding
cycloalkanes:-
1,6 dibromo hexane Zn or Na> cyclohexane
2. Diels - Alder reaction
Diene + Dienophile ---------> 1,3 butadiene + 2-butene------> 4,5dimethyl 1-cyclo hexene----->1,2dimethyl cyclohexane
3. By the reduction of aromatic hydrocarbons in presence of Ni
Benzene + 3H2 -----> cyclohexane
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Aarti gupta
askiitians Faculty
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