## Abstract Platinum metal catalysed exchange in [^3^H]acetic acid is a satisfactory method for generally labelling cyclopenta[a]‐phenanthrenes at very high specific activity.
Synthesis of Cyclopenta[a]phenanthrenes
✍ Scribed by Aldo Taticchi; Lucio Minuti; Assunta Marrocchi; Daniela Lanari
- Publisher
- John Wiley and Sons
- Year
- 2005
- Weight
- 8 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0931-7597
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## Abstract We report an efficient synthesis of cyclopenta[__b__]phenanthrenes functionalized at C‐3 and C‐8 from an optically pure Hajos–Parrish ketone. The key step is a neutral alumina‐catalyzed Michael addition of a Hajos–Parrish ketone derivative (**4**) to 1,7‐octadien‐3‐one (**2**) in 98% yi
Novel blue emitters, oligo-MCPPs (tri-MCPP, tetra-MCPP, and penta-MCPP), have been synthesized and characterized. The introduction of cyclopenta[def]phenanthrene (CPP) units into the structure of oligo-MCPPs gave LEDs with high efficiency and pure blue emission. UV-visible absorption spectra of the