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organic compounds
Cyclododeca-2,8-diyne-1,10-diol, (6), C12H16O2, and 1,10-dimethylcyclododeca-2,8-diyne-1,10-diol, (11), C14H20O2, have been prepared and their structures determined. Both crystallize in centrosymmetric space groups and the molecules have approximate C2 symmetry. For compound (6), the lengths of the triple bonds are 1.184 (3) (C2![[triple bond]](/logos/entities/z-tbnd_rmgif.gif)
C3) and 1.189 (3) Å (C8C9). The bond angles at the triple bonds (C1—C2C3 and C8C9—C10) deviate by less than 6° from 180°. For compound (11), the bond lengths of the triple bonds are 1.190 (3) (C2C3) and 1.188 (3) Å (C8C9), and the bond angles at the triple bonds are close to 175.5°. In both compounds, the two 3-hexyne chains maintain a `crossed' arrangement whereas the two alkylene chains are arranged in a manner similar to that described for unsubstituted cyclododecane.
C3) and 1.189 (3) Å (C8C9). The bond angles at the triple bonds (C1—C2C3 and C8C9—C10) deviate by less than 6° from 180°. For compound (11), the bond lengths of the triple bonds are 1.190 (3) (C2C3) and 1.188 (3) Å (C8C9), and the bond angles at the triple bonds are close to 175.5°. In both compounds, the two 3-hexyne chains maintain a `crossed' arrangement whereas the two alkylene chains are arranged in a manner similar to that described for unsubstituted cyclododecane.
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