The Use of Amberlite IRA-410 for Preparation of Terminal Chlorodeoxy Sugars

1993 ◽  
Vol 58 (4) ◽  
pp. 902-908 ◽  
Author(s):  
Nada Vukojevic ◽  
Dušan Miljković ◽  
Mirjana Popsavin ◽  
Velimir Popsavin
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Nucleophilic Displacement ◽  
Selective Reagent ◽  
Derivatives Of

Anion-exchange resin Amberlite IRA-410 was found to be an effective and selective reagent for the nucleophilic displacement of primary tosyloxy (mesyloxy) groups in 3,5-disulfonates of xylofuranose derivatives I and III, as well as in 3,5,6-trisulfontes and 3,6-ditosyl derivatives of glucofuranose V, VII and IX. In all examined cases only the primary sulfonyloxy groups were replaced with chloride anions, whereupon the corresponding terminal chlorodeoxy derivatives were obtained in good yields.

Synthesis of isomeric and enantiomeric O-phosphonylmethyl derivatives of 9-(2,3-dihydroxypropyl)adenine

1987 ◽  
Vol 52 (11) ◽  
pp. 2775-2791 ◽  
Author(s):  
Antonín Holý ◽  
Ivan Rosenberg
Keyword(s):  
Acid Hydrolysis ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Triethyl Phosphate ◽  
Gel Treatment ◽  
Derivatives Of ◽  
Pure Isomer

Reaction of 9-(S)-(2,3-dihydroxypropyl)adenine (I) with chloromethanephosphonyl chloride (VII) in pyridine or triethyl phosphate, or with chloromethyl(pyridinio)phosphonate (IX) in pyridine, afforded a mixture of 2'-(IV) and 3'-O-chloromethanephosphonate (V) which were separated on anion exchange resin or alkylsilica gel. Treatment of compounds IV and V with aqueous alkaline hydroxide, followed by deionization, gave 9-(S)-(2-hydroxy-3-phosphonylmethoxypropyl)adenine (VI) and 9-(S)-(3-hydroxy-2-phosphonylmethoxypropyl)adenine (III) (HPMPA), respectively. The (R)- and (RS)-forms of III and VI were prepared analogously from the respective (R)-enantiomer and racemate of I. 9-(S)-(2,3-Dihydroxypropyl)-N6-benzoyladenine (XIV) was converted into 3'-O-(dimethoxytrityl) derivative XVII and further into 2',N6-dibenzoyl derivative XIX. Reaction of compound XVII with IX, followed by acid hydrolysis and alkaline cyclization, afforded pure isomer VI whereas pure III was prepared from XIX by reaction with VII in triethyl phosphate and subsequent alkaline cyclization.

PEMODELAN MATEMATIS ADSORPSI CO2 DENGAN STRONG BASE ANION EXCHANGE RESIN SEBAGAI ADSORBEN UNTUK PURIFIKASI BIOGAS

2015 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Anies Mutiari ◽  
Wiratni Wiratni ◽  
Aswati Mindaryani
Keyword(s):  
Anion Exchange ◽  
Pilot Plant ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Scale Up ◽  
Sum Of Squares ◽  
Strong Base ◽  
Model Transfer ◽  
Plant Parameter

Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2  dan meningkatkan kandungan CH4  yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model  matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental   kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2  dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.Kata kunci: model matematis, adsorpsi CO2, pemurnian biogas

Catalysis of the Photodecomposition of Chloroform by a Polystyrene Anion Exchange Resin

2013 ◽  
Vol 2 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Laura A. Pena ◽  
Alissa M. Chan ◽  
Larissa R. Cohen ◽  
Karen Hou ◽  
Brent M. Harvey ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin

Anion exchange resin removal of per- and polyfluoroalkyl substances (PFAS) from impacted water: A critical review

2021 ◽  
pp. 117244
Author(s):  
Treavor H. Boyer ◽  
Yida Fang ◽  
Anderson Ellis ◽  
Rebecca Dietz ◽  
Youn Jeong Choi ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Critical Review ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Polyfluoroalkyl Substances
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