In this confermation, the molecules do have a center of symmetry. If you make models of 25a and 26a you will find that they are mirror images and * identical but, as we have said, they have no plane of symmetry. There is another symmetry test for meso configurations that is applicable to staggered conformations and can be illustrated with the tartaric acids. Mations and also whether this tartaric a c ~ d IS meso-tartar~cac~d,an opt~callyactlve tartaric a c ~ dor, racemic a c ~ dGive your reasoning
5-5A Meso Compounds (Achiral Diastereorners)
