To determine which is the re and which is the si face of a planar organic group, we simply use the same priority rankings that we are familiar with from the R/S system, and trace a circle: re is clockwise and …

The face on which the arrows curve clockwise is designated the Re face (similar to R), and the face on which the arrows curve counterclockwise is designated the Si face (similar to S).

These three atoms are assigned their atomic numbers by the CIP convention. If they are arranged in descending order (8 --> 6 --> 1) in a clockwise fashion, the face is defined as Re. If the arrangement …

A trigonal planar sp 2 -hybridized atom can be converted to a chiral center when a substituent is added to the re or si (from Latin rectus 'right' and sinister 'left') face of the molecule.

The sequence order is then determined to be a right or left turn (light blue arrow), and the viewing face is given the designation re or si, corresponding to the turn.

Oct 15, 2014 · I am considering the hydrogenation of 2-butanone with respect to its Re and Si faces. So if we look at 2-butanone as I've drawn below from above we are looking at its rectus face.

This orientation is crucial in determining the stereochemical outcome of a reaction, as the re face and si face (the opposite side) dictate the spatial arrangement of the incoming group or the leaving group.

To determine which is the re and which is the si face of a planar organic group, we simply use the same priority rankings that we are familiar with from the R/S system, and trace a circle: re is clockwise and …

When trigonal planar sp 2 carbons are considered, the priorities are evaluated and if the movement from highest priority to lowest priority is clockwise when viewed from a specific face this face is described …

If the order of increasing priority goes clockwise around the molecule, that's the "re" face. If it goes counter-clockwise, that's the "si" face. This distinction between re and si faces is crucial because it …