By use of blocked ortho-positions in the starting 2-nitrenoaryl aryl ethers, the first successful conversions of these into phenoxazines and 5,11-dihydrodibenzo[b,e][1,4]oxazepines have been achieved.
J. I. G. Cadogan and P. K. K. Lim, J. Chem. Soc. D, 1971, 1431 DOI: 10.1039/C29710001431
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