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Yourlocation:Home >News> 2-Chloroethanol is used alkylation of DEAHP-Starch

2-Chloroethanol is used alkylation of DEAHP-Starch

Time:2015/12/18 5:53:05

Alkylation of DEAHP-Starch with 2-Chloroethanol

Diethylaminohydroxypropyl (DEAHP) starch ion-exchangers (OH- form) were alkylated with aqueous solutions of 2 -chloroethanol. Alkylation on nitrogen resulted in the formation of quarternary ammonium groups in C1- form.Alkylierung von DEAHP-Strke mit 2-Chlorethanol. Diethylaminohydroxypropyl-Strke (DEAHP-Strke) als Ionenaustauscher in der Hydroxylform wurde mit w08rigen L02sungen von 2-Chlorethanol alkyliert. Die Ergebnisse zeigen, da08 bei der Reaktion von DEAHP-Strke mit 2-Chlorethanol eine Alkylierung des Stickstoffs der tertiren Aminogruppen stattfindet, was zu der Bildung von quarternren Ammoniumgruppen in 66%iger Ausbeute führte.

Ab initio calculations on 2-fluoroethanol and 2-chloroethanol with reference to the infrared photorotamerization processes in low-temperature matrices

Ab initio STO-3G optimizations have been carried out on the five conformers of 2fluoro- and 2-chloro-ethanol and on ten saddle point conformations of 2-fluoroethanol. The relative order of the calculated conformer energies is found to be Gg′ 87 Tt < Gt T~ Tg ≈ Gg′ for 2-fluoroethanol and Gg′ 87 Tt < Tg < Gt < Gg for 2-chloroethanol, the Tt 61 Gg′ energy differences being 4.0 and 5.1 kJ mol, respectively. Large variations (4–7°) are found for the angles CCO and OCH from conformer to conformer and a general angle rule is presented for primary alcohols. Neglect of this effect is the main source of error in rigid-rotation calculations on alcohols (as compared with fully optimized calculations), of the order of 5 kJ mol. The use of calculated OH stretching force constants in assigning νOH band fine structure in IR spectra is discussed. Evidence for a weak intramolecular hydrogen-bonding interaction is found, especially in the case of 2-chloroethanol. On the basis of calculated conformer energies, barriers to rotation and force constants it is deduced that for both of these alcohols the photorotamerization process in matrices is either Gg′ → Tt or Gg′ → Gt.