Помогите ознакомиться с материалом:
Paul Dowd, Soo-Chang Choi, "Free radical ring-expansion leading to novel six- and seven-membered heterocycles", Tetrahedron, Vol. 47, Iss. 27, стр. 4847-4860 (1991).
- DOI:
http://dx.doi.org/10.1016/S0040-4020(01)80951-0