Suprafacial is a synonym of disrotatory.

As adjectives the difference between suprafacial and disrotatory

is that suprafacial is (chemistry) of a chemical reaction, involving two simultaneous changes in bonding to the same face of a common centre (or related centres) of a molecular fragment while disrotatory is (organic chemistry) describing an electrocyclic reaction in which the substituents at the interacting termini of the conjugated system rotate in opposite senses.