1: With sulfuric acid; water
T=60°C; 24 h;
2: With hydrogenchloride in water
T=90°C; 5 h;
参考文献
Barber, Christopher Gordon; Bunnage, Mark Edward; Harvey, John Wilson; Mathias, John Paul
Patent: US2005/20611 A1, 2005 ;
Location in patent: Page/Page column 28 ;