Bayer's strain theory

1. Adolf bayer proposed the relative stability of cycloalkanes.

2. The normal bond angle between any two adjacent Sp³carbon atoms in the ring structure is 109° 28'

3. Any deviation (+ve -ve) designation from the normal tetra bond angle 109° during the formation of a ring produces strain in the resulting molecule unstable form.

4. The greater the deviation form the normal angle for greater is a strain and therefore lesses in the stability.

5. The strain is directly proportional to the distortion (twisting) of the normal valency angles. Byer's calculated angle strain of cycloalkanes of various ring sizes of the following formula.

Angle strain = 1/2 [ 109° 28' ]

VARIOUS ANGLE STRAIN:-

Bayer's strain theory could explain the relative stability of cycloalkanes upto six carbon atom rings. bayer's postulated that any deviation of bond angles from the normal tetrahedral value should impose a condition of internal strain.

EX:- Cyclohexane............

Puvvukonvict.........