It has also been showed that the reaction can be carried in the solvent of PEG-1000 or peregal-15 without adding sodium hydrate or in the solvent of OP-10 with adding small amount of sodium hydrate.

• 研究还表明，以PEG-1000和平平加-15为溶剂时，合成中不需要加入氢氧化钠，以OP-10为溶剂时只需要加入少量氢氧化钠。