Pyrolytic elimination Chugaev

Double bonds can be created by a number of available stereospecific reactions (E2 elimination, pyrolytic elimination, e.g. Cope, Chugaev reactions), stereoselective Wittig and related reactions, reduction of triple bonds, by cisitrans isomerisation of existing double bonds either photochemically or by wet chemistry, e.g. the Corey-Winter procedure. [17]... 

Some intramolecular eliminations that occur thermally are known as pyrolytic eliminations, and many of these reactions result in syn elimination. Often these reactions are carried out in the gas phase, where they are not affected by solvent, counterions, or other species that can affect reactions in solution. One of the most-studied pyrolytic eliminations is the Chugaev reaction (equation 10.70). Reaction of an alcohol having a j8-hydrogen atom with sodium or potassium metal or with a strong base... 

---