Abstract
( R, R)-1,1′-Bis(2-chloroformyl-1-phenylethyl)ferrocene undergoes SnCl 4 promoted intramolecular Friedel-Crafts cyclisation to give a 1.5:1 ratio of singly bridged ferrocenophane isomers. After separation of their corresponding methyl esters, the major isomer is converted into the novel C 2-symmetric ferrocenophane ( R, R, p S, p S)-1,1′-(1-phenyltrimethylene)-3,3′-(3-phenyltrimethylene)ferrocene, as determined by an X-ray crystal structure analysis.
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