High-valency gold complexes with this geometry have been catalyst candidates for enantioselective cyclizations. Ligand substitutions of complexes with this geometry form intermediates that undergo Berry pseudorotation. An addition of methyl iodide (-5[1])to an iridium complex with this geometry is the first step in the Cativa process. Low-spin d8 complexes, which have this geometry, violate the 18-electron rule, as exemplified by group 10 complexes such as Zeise’s salt. Compounds (10[1])with this geometry have D4h point groups. Complexes with this geometry are stabilized by the “trans effect,” which impacts the synthesis of cisplatin, a drug with this geometry. For 10 points, name this geometry of compounds that have four substituents and two lone (10[1])pairs, in which all bond angles are 90 degrees. ■END■ (0[1])