** (0:0 adduct with 00-cr-0). Thermal ellipsoids are depicted at the 00% probability level. Hydrogen atoms are omitted for clarity.](om0c00000_0000){#fig0}  ![ORTEP diagram for compound **0b** (0:0 adduct with 00-cr-0). Thermal ellipsoids are depicted at the 00% probability level. Hydrogen atoms are omitted for clarity.](om0c00000_0000){#fig0}  ###### Selected Bond Lengths *d* (Å) and Sum of Valence Angles ∑α