niobium bromide; dibenzoyl peroxide in acetonitrile
T=60°C; oxidation with trityl tetrafluoroborate less yield; Yield given. Yields of byproduct given;
参考文献
Doyle, Michael P.; Dow, Robert L.; Bagheri, Vahid; Patrie, William, J.
Journal of Organic Chemistry, 1983 , vol. 48, # 4 p. 476 - 480