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2005
Phenanthrene derivatives
Q 1090
Ring-Closing Olefin Metathesis of 2,2'-Divinylbiphenyls: A Novel and General
to Phenanthrenes. — The title reaction is proven to be a general method
04- 106 Approach
for obtaining high yields of substituted phenanthrenes. Using the first- or second-generation Grubbs catalysts gives results that depend on the conformational rigidity of the
biphenyl moiety as well as the electronic properties of the substituents. The second-generation Grubbs catalyst affords quantitative yields of the phenanthrene derivative
independent of the structure of the starting biphenyl. The sole limitation of this method
is the impossibility to obtain phenanthrenes having substituents at positions 9 and 10.
— (IULIANO*, A.; PICCIOLI, P.; FABBRI, D.; Org. Lett. 6 (2004) 21, 3711-3714;
Dip. Chim. Chim. Ind., Univ. Pisa, I-56126 Pisa, Italy; Eng.) — Steudel
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