Have you already thought about all the ligands? The majority of these are C2- symmetric but why?
Oxazaborlidine of Corey is not symmetric nevertheless has so much applications. It’s only for some years that asymmetric ligands have begun to be design. Did it was a fashion model ? It’s right ….symmetric molecules seems more beautiful than asymmetric molecules but in the chemistry’s field we don’t work with one or an other molecule because we prefer an enjoyable molecule.