Fig. 6. Displacement ellipsoid (50%) representation of (top) 2-Na and (b) the anion of 
. For clarity, H-atoms are omitted and tBu groups are shown as sticks. There are two THF ligands to Na+ that are disordered, as shown (S: 24.5%, R: 75.5%); see the ESI.† Select bond distances (Å) for 2-Na: Ti1–O8 1.7796(25), Ti1–O1 1.8090(24), Ti2–O1 1.8090(25), Ti2–O2 1.7939(24), Ti3–O2 1.8285(24), Ti3–O3 1.7660(25), Ti4–O3 1.8634(25), Ti4–O4 1.7456(27), Ti5–O4 1.9075(26), Ti5–O5 1.7451(28), Ti6–O5 1.9473(27), Ti6–O6 1.9556(26), Ti7–O6 1.7346(27), Ti7–O7 1.8830(26), Ti8–O7 1.7571(25), Ti8–O8 1.8459(25). Select bond distances (Å) for 
: Ti1–O2 1.8445(1), Ti1–O1 1.7990(1), Ti2–O1′ 1.8514(1), Ti2–O2 1.7666(1).
