The sulfuric acid-promoted reaction of benzo-15-crown-5 O) and benzo-18-crown-6 (6) with aliphatic aldehydes, leading to the formation of anthracene crown et~rs, was studied. A substantial substiment effect on the reaction comse was found. For the isdmtyi group the highest yield was obtained, while
The discovery of crown ethers
โ Scribed by Charles J. Pedersen
- Book ID
- 105051833
- Publisher
- Springer Netherlands
- Year
- 1992
- Tongue
- English
- Weight
- 178 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0923-0750
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The Synthesis of Anthracene Crown Ethers Derived from Benzo-Crown Ethers. -A method to obtain anthracene crown ethers starting from benzo-15-crown-5-ether and benzo-18-crown-6-ether and various aldehydes is described. The yield strictly depends on the aldehyde. Cyclohexanone leads to a new class of
3-Phenyl-and 3-(p-methoxyphenyl)-7,8-dihydroxy and -6,7-dihydroxychromenones were prepared from ethyl 3-oxo-2-phenylpropanoate, ethyl 3-oxo-2-(4-methoxyphenyl)-propanoate and the trihydroxy benzenes in H 2 SO 4 . 3-Aryl-7,8-and3-aryl-6,7-dihydroxy-2H-chromenones reacted with the bis-dihalides of pol