| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| 2,3-萘二酮,1,4-二氢-1,1,4,4-四甲基- | 1,1,4,4-tetramethyltetralin-2,3-dione | 17471-49-7 | C14H16O2 | 216.28 |
| —— | 2-Hydroxy-1.1.4.4-tetramethyl-3-oxo-tetralin | 29020-99-3 | C14H18O2 | 218.296 |
| —— | 1-Acetyl-1,3,3-trimethylindan | 42041-91-8 | C14H18O | 202.296 |
| 1,1,3,4-四甲基-2-茚酮 | 1,1,3,3-tetramethylindane-2-one | 5689-12-3 | C13H16O | 188.269 |
| —— | 1,1,3,4-Tetramethyltetralin | 196615-46-0 | C14H20 | 188.313 |
| —— | 3-Acetoxy-1,1,4,4-tetramethyl-2-tetralon | 62157-69-1 | C16H20O3 | 260.333 |
| —— | β-Methyl-β-(2'-isopropyl-phenyl)-buttersaeure | 92300-81-7 | C14H20O2 | 220.312 |
| 1,1,4,4-四甲基-1,2,3,4-四氢-[2]萘酚 | 1,1,4,4-Tetramethyl-2-tetralol | 67756-34-7 | C14H20O | 204.312 |
2-(Dichloromethylidene)-1,1,3,3-tetramethylindane was “hydrolyzed” by solid KOH in DMSO as the solvent at ≥100 °C through an initial chlorine particle transfer to give a Cl,K-carbenoid. This short-lived intermediate disclosed its occurrence through a reversible proton transfer which competed with an oxygen transfer from DMSO that created dimethyl sulfide. The presumably resultant transitory ketene incorporated KOH to afford the potassium salt of 1,1,3,3-tetramethylindan-2-carboxylic acid (the product of a formal hydrolysis). The lithium salt of this key acid is able to acylate aryllithium compounds, furnishing one-sidedly overcrowded ketones along with the corresponding tertiary alcohols. The latter side-products (ca. 10%) were formed against a substantially increasing repulsive resistance, as testified through the diminished rotational mobility of their aryl groups. As a less troublesome further side-product, the dianion of the above key acid was recognized through carboxylation which afforded 1,1,3,3-tetramethylindan-2,2-dicarboxylic acid. Brominative deoxygenation of the ketones furnished two one-sidedly overcrowded bromoalkenes. Some presently relevant properties of the above Cl,K-carbenoid are provided in Supporting Information File 1.