中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
四甲基环丁烷-1,3-二酮 | 2,2,4,4-tetramethyl-1,3-cyclobutanedione | 933-52-8 | C8H12O2 | 140.182 |
3-羟基-2,2,4,4-四甲基环丁烷-1-酮 | 3-hydroxy-2,2,4,4-tetramethylcyclobutanone | 4916-59-0 | C8H14O2 | 142.198 |
Because the postulated non-planarity of sym-tetramethylcyclobutanedione is based on a small value of electrical polarization, the cis- and trans-2,2,4,4-tetramethylcyclobutane-1,3-diisocyanides have been prepared and stereospecifically rearranged to the analogous dicyanides. These substances show sufficiently large polarizations that the explanation of ring non-planarity is substantiated. Calculations in terms of the expected and observed dipole moments show that the ring deviates 20–30° from planarity. Although this non-planarity is not static, according to consideration of the cis geoisomers it would appear that one conformation is more prevalent than any others.