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[1] For a recent review cfr. , «Angew. Chem. Int. Ed.», 6, 897 (1967).
[2] Decalin has been used as solvent for the study of decomposition of aryl-azides: et al., «J. Amer. Chem. Soc.», 84, 480 (1962); see et al., «J. Org. Chem.», 33, 4286 (1968) too.
[3] Some urethanes are new compounds: all gave correct IR and NMR spectra and satisfactory elemental analysis: cfr. «C. A.», 31, 46444 (1937).
[4] See ref. 1.
[5] Compare et al., «J. Amer. Chem. Soc.», 91, 5107 (1969).
[6] et al., «J. Amer. Chem. Soc.», 90, 7097 (1968) and ref. 1.
[7] , Free radical in solution, 418-436, J. Wiley, New York 1957.
[8] However, recent evidence, cfr. ref. 5, support the concerted nature of the process.
[9] et al., «J. Amer. Chem. Soc.», 87, 2590 (1965).