SCHEDULED MAINTENANCE
A phosphorus analogue of the Graebe–Ullmann reaction is described in which the carbazoles (4) are formed by photolytic extrusion of PhP(O)(OMe)2 from the oxazaphosphoranes (1); this provides a two-step, complete deoxygenation of the readily available ethers (2) to the carbazoles.
J. I. G. Cadogan, B. S. Tait and N. J. Tweddle, J. Chem. Soc., Chem. Commun., 1975, 847 DOI: 10.1039/C39750000847
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