The fourteen-membered ring of 7,7,12,12-tetramethyl-1,4-(R,S) isomer 18a revealed a transannular interaction between the dioxaethane bridge and the dicarbonyl moiety. dioxacyclotetradecane-8,9,10,11-tetrone (4) was built up from 1,2-bis(2Π-chloroethoxy)ethane, two units derived from Calculations (HF
Synthesis and Properties of 4,4,9,9-Tetramethyl-1-oxa-cycloundecane-5,6,7,8-tetrone and 5,5,10,10-Tetramethyl-1-oxa-cyclotridecane-6,7,8,9-tetrone
β Scribed by Prof. Dr. Rolf Gleiter; Dr. Uwe Ackermann; Dr. Thomas Oeser; Prof. Dr. Hermann Irngartinger
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 850 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0947-6539
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract The synthesis of 5,5,10,10βtetramethylβ1βoxacyclotridecanβ6,7,8,9βtetrone (12) was achieved via a multistep procedure involving an oxidation known as the Rubottom reaction. The key intermediates were the dialdehyde (25), the diacid (33), the cyclic diketone (39) and the bis(silyl enol e
Fifteen title compounds, e.g. (I)-(III), are prepared essentially as described previously. Evaluation of their absorption, emission and laser properties shows that N-allyl substituted derivatives (Ia) and (IIa) have high fluorescence quantum yields and laser efficiencies of 137 and 140%, respectivel