centrum chiralności

With two chiral centres, you can form 4 different isomers.

When only one chiral centre is changed at a time, sets of diastereoisomers are formed.

It also means that the sulfur can be a chiral centre.

Still other enzymes produce new chiral centers, always with a high specificity.

Why isn't it possible to orient the groups around the chiral center to achieve more forms?

This is due to the extra chiral center at C-2.

This is a very good way to create new chiral centres.

A meso compound need not even have a chiral center.

This is particularly the case in the synthesis of molecules with chiral centres.

The 2-ketopentoses have two chiral centers, and therefore four different stereoisomers are possible.