Stable restricted rotation isomers about the SP3-SP3 carbon-carbon bonds in 9,9′:9′,9″-terfluorenyls at room temperature

✍ Scribed by Kazuo Suzuki; Masahiro Minabe

• Publisher: Elsevier Science
• Year: 1974
• Tongue: French
• Weight: 227 KB
• Volume: 15
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)93131-4

✦ Synopsis

During the syntheses of fluorene derivatives, we have obtained by the following reactions two kinds of rotational isomers which are stable at room temperature in solution. Compound (A) mp 293'C(dec) was first obtained by Pinck and Hllbert 1) on the Michael reaction of 9,9'-blfluorenylidene (1) with fluorene, and compound (B) mp 257°C(dec)2) was also obtained by treatment of fluorene with sodamide. Both compounds C3gH26 give fluorenone by oxidation and fluorene by reduction.