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Abstract o ‐Quinone methanide N ‐methoxyimines 6a‐c, 7a‐c, 11a‐b and 12a , easily prepared from the reaction of 10‐(methoxyimino)phenanthrene‐9‐one ( 3 ) with phosphonium salts 5a‐c, 10a‐b in the presence of lithium hydroxide, are thermally converted into dibenzo[f,h]quinolino[2,3‐ x ]fused compounds 9a‐c and 13a‐b , in high yield.
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Nicolaides et al. (1991) studied this question.
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