中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
1,2-二氢乙酰萘-5-醇 | acenaphthen-5-ol | 6373-33-7 | C12H10O | 170.211 |
5-苊醛 | acenaphthene-5-carbaldehyde | 5345-46-0 | C13H10O | 182.222 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
1,2-二氢乙酰萘-5-醇 | acenaphthen-5-ol | 6373-33-7 | C12H10O | 170.211 |
—— | 5-Hydroxyacenaphthen-4-carbaldehyd | 16804-09-4 | C13H10O2 | 198.221 |
Aryl formates 4a-u, 6 , 8 , 10, 12, 14, 16, 18, 20, 22, 24, 26 are prepared by formylation of hydroxyarenes 3a-u, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 with N,N-diformylacetamide (1) or triformamide (2), respectively, in fairly good yields. The reactions can be catalyzed by sodium diformamide or praseodymium(III) triflate. The thiolformate 28 was obtained analogously from 1-thionaphthol (27).
芳香基甲酸酯4a-u、6、8、10、12、14、16、18、20、22、24、26是通过羟基芳香化合物3a-u、5、7、9、11、13、15、17、19、21、23、25分别与N,N-二甲酰乙酰胺(1)或三甲酰胺(2)甲酰化反应得到的,产率相当不错。这些反应可以通过二甲酰胺钠或镨(III)三氟甲磺酸催化。巯基甲酸酯28是类似地从1-硫代萘酚(27)得到的。
The aromatic hydroxyaldehydes 3a-3g, 5a-5f, 8 , 10 can be prepared by the action of BCl3, BBr3 or trifluoromethanesulfonic acid, on the aryl formates 1a-1f, 4a-e, 7, 9 via Fries rearrangement. BBr3 is more effective than BCl3. The activating ability of BBr3 can be improved by addition of FeCl3. Rearrangements which are induced by trifluoromethanesulfonic acid can give rise to the formations of regioisomers, which might be different from the products formed when the reaction is performed with Lewis acids. The yields of the aldehydes are lowered by subsequent condensation reactions. This view was confirmed by the isolation of a condensation product, which was characterized as a dibenzo[a,j]xanthene derivative 6 by crystal structure analysis. For the Fries rearrangement of formyl groups a new mechanism is proposed. 2-Hydroxy-1-naphthaldehyde 5c can be obtained in good yield from formic acid, BBr3, and 2 -naphthol.