sulfuric acid in dichloromethane mixed on constant stirring for 1 h; chromd. (CH2Cl2/cyclohexane = 20/80);
参考文献
Foulds, Gary A.; Johnson, Brian F. G.; Lewis, Jack; Sorrell, Robert M.
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1986 , p. 2515 - 2518
