Synthesis and Molecular Structure of 4′,9′,4^″,9^″-Tetra-tert-butyl-1′,6′,1^″,6^″-tetramethoxy-2,5-dioxa[3.3]metabiphenylophane

Figure 1

(a) Top and (b) side views of 4′,9′,4′′,9′′-Tetra-tert-butyl-1′,6′,1′′,6′′-tetramethoxy-2,5-dioxa[3.3]metabiphenylophane 3. Only one of the two 1,2-alternate isomers is shown. Displacement ellipsoids are drawn at the 50% probability level. All hydrogen atoms are omitted for clarity. The red and grey ellipsoids represent O and C atoms, respectively.

(a)

(b)