中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2,4,6-Tri-tert-butyl-benzoesaeure-methylester | 57198-99-9 | C20H32O2 | 304.473 |
—— | 2,4,6-tri-tert-butylbenzoyl chloride | 20208-55-3 | C19H29ClO | 308.892 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2,4,6-tri-tert-butylacetophenone | 22744-29-2 | C20H32O | 288.473 |
—— | 2,4,6-tri-tert-butylbenzoyl chloride | 20208-55-3 | C19H29ClO | 308.892 |
—— | 2',4',6'-tri-tert-butylstyrene | 33241-82-6 | C20H32 | 272.474 |
A series of yttrium, ytterbium, and lanthanum hexa-or heptacoordinate complexes were prepared and their catalytic activities tested in the hetero Diels–Alder reaction between crotonaldehyde and ethyl vinyl ether. It was found that a pKa below 7 of the ligand was necessary but not sufficient for catalytic activity. It was determined that the ligand should possess a perfluoromethyl-β-diketonate functionality. Other factors such as bite angle and hinging motion may also play a determining role. Keywords: lanthanide, catalyst, hetero Dielsis–Alder, yttrium, ytterbium, lanthanum.