267900-98-1

Upstream product

• 19249-03-7 triethylene glycol di-(p-toluenesulfonate) 
• 247049-50-9 p-tert-butyl-calix[6]-1,4-crown-4 
• 189832-67-5 5,11,17,23,29,35-hexakis(tert-butyl)-37,38,39,40,41-hexakis(hydroxy)calix[6]arene 

Relevant academic research and scientific papers

Synthesis of p-tert-butylcalix[6]-1,4-2,5-bis-crowns

The synthesis and complexation properties of the first example of p- tert-butylcalix[6]-1,4-2,5-bis-crowns are reported. Their complexation abilities and selectivities are different from that of analogous calix[6]crown. Compound 2b exhibits high complexat

Stereoisomerism and complexation behaviour of functionalized p-tert-calix[6]-1,4-2,5-biscrown-4

p-tert-Calix[6]-1,4-2,5-biscrown-4 was subjected to functionalization by benzyl bromide or ethyl bromoacetate. Two pairs of disubstituted calix[6]biscrown stereoisomers were obtained. Their structures had been deduced from 1H NMR and ESI-MS (el

Syntheses of novel types of calix [6]bis-crowns and related compounds

The syntheses of novel types of p-tert-butylcalix[6]bis-crowns and related compounds is described. By reacting p-tert-butylcalix[6]-1,4-crown-4 with ethylene glycol ditosylate or polyethylene glycol ditosylates using NaH as a base in DMF, p-tert-butylcalix[6]-2,3-ethylene-1,4-crown-4, p-tert-butylcalix[6]-1,4-crown-4-2,6-crown-3, monotosyloxyethoxyethyl-p-tert-butylcalix[6]-1,4-crown-4, p-tert-butylcalix[6]-1,4-crown-4-2,5-benzocrown-4 and p-tert-butylcalix[6]-1,4-crown-4-2,6-crown-5 were obtained in reasonable yields under selective conditions.