Re
,
Si
A
stereoheterotopic
face of a trigonal atom is designated
Re
if the
ligands
of the trigonal atom appear in a clockwise sense in order of
CIP
priority
when viewed from that side of the face. The opposite arrangement is termed
Si
.
See also:
enantiotopic
, and illustrated under
prochirality
.
Source:
PAC, 1996,
68
, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2216