 In the simplest model, a conformationally constrained cyclohexanone is reduced to the corresponding alcohol.Reducing agents add a hydride to the carbonyl carbon via attack along the Burgi–Dunitz angle, which can come from the top along a pseudo-axial trajectory or from below, along a pseudo-equatorial trajectory.It has long been known that large reducing agents add hydride to the equatorial position to avoid steric interactions with axial hydrogens on the ring.