what is saytzeff's rule - Chemistry - Hydrocarbons

Question

what is saytzeff's rule????

Urvashi Yadav · Accepted Answer

In dehydrogenation reaction (removal of
Hydrogen and Halogen atoms) from alkyl halide,

This is saytzeff rule
states:

halogen atom is removed from alpha carbon
(the carbon with with halogen is attached) and
hydrogen is removed from beta carbon (the
carbon attached to the alpha carbon directly) which is itself
attached with more no of alkyl groups
The product is alkene which has greater no of
alkyl groups attached to the doubly bonded carbon
atoms

Hence, 2-Bromopentane gives Pent-2-ene as the
major product

The second carbon from right is alpha carbon
while 1st and 3rd is beta carbon 3rd carbon is attached with other
ethyl group (C-4 ), so hydrogen is removed from this to get alkene
according to above said rule

This rule is for alkyl halides
only