Phenanthrene-9-carboxylic acid chloride

Several helical polycyclic hydrocarbons bearing aryl substituents in the most hindered positions were synthesized in this way. The starting material 2-benzo[c]phenanthrenyl-rerr-butylketone 3.601 was prepared as follows (Scheme 3.50) [279]. Treatment of 2-benzo[c]phenanthrene-2-carboxylic acid 3.600 with thionyl chloride formed the corresponding acyl chloride. Reaction of the latter with er -butyl copper (obtained... 

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