Novel Bis-(N-alkyl-N ,N-dimethyl-ammonium) Polyethyleneglycol Ether Salts as Phase Transfer Catalysts in the Condensation of l,4-Diacetyl-2,5-piperazinedione and Aldehydes

WANG Li-xin, XU Ming-hua, SHI Yao-zeng, HU Hong-wen

Chemical Research in Chinese Universities . 1995, (2): 178 -184 .