222549-99-7Relevant academic research and scientific papers
Selective bridging of p-tert-butylcalix[6]arene with polyethylene glycol ditosylates
Li, Jiansen,Chen, Yuanyin,Lu, Xueran
, p. 10365 - 10374 (1999)
A convenient method for preparing various p-tert-butylcalix[6]crowns and related compounds has been developed. By refluxing p-tert-butylcalix[6]arene with ethylene glycol ditosylate or polyethylene glycol ditosylates using K2CO3 as a base in acetonitrile, 1,2-ethylenecalix[6]arene, 1,3-and 1,4- calix[6]crown-3, 1,3-and 1,4-calix[6]crown-4, 1,4-calix[6]benzocrown-4, 1,2- and 1,3-calix[6]crown-5 were obtained selectively. A rather flattened (o, o, o, o, o, o) conformation, adopted by the constrained 1,4-calix[6]crown-3 at ambient temperature, was observed for the first time.
Syntheses of lower-rim-1,3-crowned calix[6]arenes and their complexation abilities toward cations
Chen, Yuanyin,Li, Jiansen,Xin, Jun,Zhong, Zhenlin,Gong, Shulin,Lu, Xueran
, p. 705 - 711 (2007/10/03)
An approach to lower-rim-1,3-crowned calix[6]arene and its derivatives in one-pot process has been accomplished. In the presence of very excess Na2CO3 (27-150 equivalent per mole p-tert-butylcalix[6]arene 1) in acetonitrile, the lowe
