it contain preparation or synthesis of cycloalkanes

1. Preparation of cycloalkanes

2. It is regarded as internal wurtz
reaction

3. • When dihlogen derivative of paraffin are
treated with zinc or sodium, corresponding
cyclopropane is formed.
• In dihalogen atoms two halogens are apart in
1: 6 then rings wont form. But it undergoes
wurtz reaction to form long chain alkanes.

4. When calcium or barium salt of
dicarboxylic acid is distilled a ketone is
formed
Barium adipate Cyclopentanone

5. Cyclic ketones can be directly
converted into cyclo alkanes by
clemmenson reduction
Cyclohexanone
Cyclohexane

6. By using acetoacetic ester, it is possible to
prepare rings containing 3,5,6 and 7 carbon
atoms but not four; all attempts to prepare a
four membered ring result in the formation of
dihydropyran derivative

7. Certain cyclic ketones obtained by
Dieckmann reaction. This reaction is
intramolecular acetoacetic ester
condensation [claisen condensation].
This raction is carried out by treating
the esters of adipic acid with sodium.

9. Hydroxy cyclic compound may be
prepared by reducing certain diketnes
with magnesium amalgam; the
reaction is pinacol reduction.
Heptane-2:6-dione
1:2 dimethyl cyclo pentane 1;2 diol

10. Diel’s alder reaction