inversion

It''s not very clear question, but i guess you''re talking about inversion from dextro rotatory compound to levo rot. or vice versa...

Explaination

Suppose a compound is optically active i.e. it rotates plane polarised light (light waves having oscillation in one plane) in some direction i.e clockvise(dextro) or anticlockvise (levo).

Now, when it reacts with certain compound , forms two products which are also optically active but have opposite direction of rotation, in case the major product has same rotation as of initial compound, the mixture would obviously have the net rotation of major product and there would be no inversion, but if the major product have the opposite rotation than initial product than the net rotation is of major product which has opposite rotation, resulting inversion.

Also if only single product is formed which rotates the plane polarised light in opposite direction than initial compound , leads to inversion.

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