Phosphorylation of polyethylene imines in chloroform in the presence of calix[4]resorcinarenes

Solubilities of C-Tetraalkylcalix[4]resorcinarenes in SCCO2: Experimental Measurements, Characterization, and Correlation

“…Infrared spectra of the samples were recorded on an IRAffinity-1 (Shimadzu) FTIR spectrophotometer equipped with a miracle attenuated total reflectance attachment. In the IR spectra of the cyclic oligomer products, an oscillation band at about 3400 cm −1 for the C-tetramethylcalix [4]resorcinarene ( Figure 3a) and at 3200 cm −1 for the C-tetrapentylcalix [4]resorcinarene ( Figure 3b) was observed, which is characteristic of the oscillations of the OH groups of the cyclic calix [4]resorcinarene ring; thus the cyclic structure of the oligomers obtained was confirmed. It should be noted that an amplification in the intensity in the range of (2845 to 2955) cm −1 of the bands characteristic for the alkyl substituent in the spectrum of tetrapentylcalix [4]resorcinarene ( Figure 3b) compared to the band intensity in the spectrum of the C-tetramethylcalix[4]-resorcinarene ( Figure 3a) was observed.…”

“…Recently, Karasek et al 16 reported the solubility of calix [6]arene and 4-tert-butylcalix [4]arene in pressurized hot water. Moreover, to the best of our knowledge, there are no experimental data available in the open literature on the solubility of resorcinarenes in SCCO 2 .…”

“…This paper is organized as follows: In the Experimental Section we will first briefly discuss the synthesis of the two calix [4]resorcinarenes and their characterization. Then, the experimental procedure for measuring their solubility in SCCO 2 and the analyses of the extracts obtained will be presented.…”

“…We will perform a series of studies, and we begin by examining the solubility of two model representatives of C-tetraalkylcalix [4]resorcinarenes, namely C-tetramethylcalix [4]resorcinarene (C 32 H 32 O 8 ) and C-tetrapentylcalix [4]resorcinarene (C 48 H 64 O 8 ). The structures of the two oligomers are shown in Figure 1.…”

Reactions in Supramolecular Systems

“…The complexation of PEI and CR is shown to change the nucleophilicity of the polymer, which is exemplifi ed by the reaction between APEI and phosphinate 12 . 63 Based on the NMR 31 P data a conclusion is drawn that PEI rather than CR functions as a nucleophile towards the substrate in the PEI/CR/chloroform system. CR mediates this reaction as a catalytic species involved in the mixed aggregation.…”