Poly ethylenimine s

Murakami, A. Nakano, R. Miyata, and Y. Matsuda,. Chem. Soc., Perkin Trans. 1, 1979,1669. 

The rate of acylation of 4-nitrophenyl acetate by hydrophobic hydroxamate anions is increased by more than 100-fold in the presence of poly(ethylenimine)s partially quatemized by stearyl bromide.  

An acylated pyridinium intermediate, indicating nucleophilic catalysis, can be detected in the catalysed hydrolysis of 4-nitrophenyl carboxylates by a dialkylated pyridine attached to laurylated poly(ethylenimine).  

The rate of hydrolysis of 4-nitrophenyl caproate decreases with an increasing amount of imidazole residues on poly(ethylenimine). This is attributed to the aggregation of the imidazoles in a hydrophobic cavity while reaction occurs on the polymer surface.  

The rate of hydrolysis of 4-nitrophenyl caproate catalysed by poly(ethyl-enimines) containing imidazole residues is markedly enhanced in the presence of divalent metal ions. The order of effectiveness is Cu Co Zn Ni Mn , with copper(ll) increasing the rate ca. 20-fold. The acceleration by the metal ion is much greater in the presence of acetate and chloride ions than in the presence of perchlorate ions.  

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The CROP of N-tetrahydropyranylazlridine results in the tetrahydropyran-protected linear poly(ethylenimine) and, thus, provides straightforward access to linear poly(ethylenimine) by acidic removal of the tetrahydropy-ran groups (Scheme 8.23) [136]. As discussed previously, linear poly(ethylenimine) cannot be prepared by simply polymerizing ethylenimine because of transfer reactions resulting in branched polymers. Poly(ethylenimine)s with polymerizable methacrylate side groups have been reported based on the CROP of 2-(l-aziridinyl)ethyl methacrylate (Scheme 8.23) [137]. Subsequent radical polymerization of the methacrylate moieties results in densely crosslinked... 

The rate of animolysis of acyl salicylates by poly(ethylenimine)s is 10 —lO -fold faster than that by methylamine. ... 

Poly(ethylenimine S-alkyldithiocarbamate) polymers were prepared from respective poly(ethylenimine sodium dithiocarbamate) and alkyl chlorides, aralkyl chlorides, substituted alkyl esters of chloroacetic acid, p-chloroethyl esters of carbamic and carboxylic acids, and N-substituted chlorocarboxamides. The derivatives thus obtained were decomposed both physically and chemically to release sulfur and sulfur-containing substances which acted as controlled-release herbicides or fungicides. One author has proposed reactions of the pesticide 2,6-dichlorobenzaldehyde with diols and amines to form polyamide polycondensation products. ... 

Christensen LV, Chang CW, Kim WJ et al (2006) Reducible poly(amido ethylenimine) s designed for triggered intracellular gene delivery. Bioconjug Chem 17 1233-1240... 

E. S. Tillman and N. S. Lewis, Mechanism of enhanced sensitivity of linear poly(ethylenimine) - carbon black composite detectors to carboxylic acid vapors , Sensors And Actuators B - Chemical 96, 329 (2003). 

Jeong, J.H., Song, S.H., Lim, D.W., Lee, H., and Park, T.G. (2001) DNA transfection using linear poly(ethylenimine) prepared by controlled acid hydrolysis of poly(2-ethyl-2-oxazoline). Journal of Controlled Release 73 391-399. 

Result to 1 Reaction of methylpheophorbide-a (S b) with poly(ethylenimine) leads under splitting of a 5-membered ring to the water soluble polymer chlorin derivative 14) (Eq. 7) containing one porphyrin per 10 - 10 units of the polymer. Reaction with epichlorhydrin produces unsoluble materials with network structure. The reaction is controlled by electronic spectra (typical red shift frmn 632 to 644 nm while turning 8 b to 14). 

Kobayashi S, Hiroishi K, Tokunoh M, Saegusa T. Chelating properties of hnear and branched poly(ethylenimines). Maeromolecules 1987 20 1496-1503. 

Dowhng S. Binding of sulfonated fiuorophors by metal-poly (ethylenimine) complexes. Maeromolecules 1986 19 344-354. 

NOR Norman, A.I., Manvilla, B.A., Frank, E.L., Niamke, J.N., Smith, G.D., and Greer, S.C., Partitioning of poly(ethylene oxide), poly(ethylenimine), and bovine serum albumin in isobutyric acid + water, Macromolecules, 41, 997, 2008. 

J. H. Jeong, S. H. Kim, S. W. Kim and T. G. Park, Polyelectrolyte complex micelles composed of c-raf antisense oligodeox)mu-cleotide-poly(ethylene glycol) conjugate and poly(ethylenimine) effect of systemic administration on tumor growth. Bioconjugate Chem., 16,1034-1037 (2005). 

L. Antonietti, C. Aymonier, U. Schlotterbeck, V. M. Garamus, T. Maksimova, W. Richtering and S. Mecking, Core-shell-structured highly branched poly(ethylenimine amide)s synthesis and structure. Macromolecules, 38,5914-5920 (2005). 

Bisht, H. S., Manickam, D. S., You, Y. Z. and Oupicky, D. (2006) Temperature-controlled properties of DNA complexes with poly(ethylenimine)-grafl-poly(N-isopropylactylamide), Biomacromolecules, 7, 1169 78. 

YORK s, FRECH R, SNOW A and GLATZHOFER D, A comparative vibrational spec-troscopicstudy of lithium triflate and sodium triflate in linear poly(ethylenimine) , Electrochim Acta, 2001, 46,1533-1537... 

Analogous to the vinyl polymers which contain imidazole, poly-(ethylenimine-g-L-histidine) exhibits large rate enhancements due to hydrophobic interactions. This effect may be seen if one examines the rate of hydrolysis of a series of 4-acyloxy-3-nitrobenzoic acids (S -). As the length of the acyloxy group increases, the rate initially drops from 82 to S " and then increases dramatically (Figure 11). The kinetics of the hydrolysis of were complicated... 

S.3.2.2 Azetidines The CROP of azetidines without the N-substituent is very similar to the CROP of ethylenimine as discussed in the previous section. As such, the CROP of azetidine is accompanied by a large number of hydrogen transfer, chain transfer, and termination reactions resulting in the formation of branched poly(propylenimine) comprising a mixture of primary, secondary, and tertiary amines [141]. 

Dimethyl-, Diethyl-, Diisopropyl-, Di-butyl-, Dicyclohexyl-, Dibenzylamine, Poly-S-isobutyl-ethylenimine Amines, tert.. Trialkyl-amines... 

The discovery CNs by lijima in 1991 [1] captured the attention of researchers in a wide range of areas. The CNTs have high tensile strength (100 GPa), high Yotmg s modulus (0.6 TPa) [12] and exceptional electrical conductivity (5000 S/cm) [13]. CNTs have been used as a reinforcement filler in polyvinyl alcohol [14], epoxy [15],poly-(propionylethylenimine-co-ethylenimine) [16] host matrices. The addition of CNTs has also been foimd to increase the strength and condnctivity of polypyrrole (PPy) [17]. The addition of CNTs to polyoctylthiophene (POT) has been shown to enhance the conductivity by 5 orders of magnitude with an 11% (w/w) percolation threshold... 

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