• Title/Summary/Keyword: N-Methyl piperazine

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Absorption Properties of $CO_2$ in Aqueous Solutions of Piperazine, Piperidine, Cyclohexylamine (Piperazine, Piperidine, Cyclohexylamine 수용액에 대한 이산화탄소의 흡수특성)

  • Song Ho-Jun;Lee Seoungmoon;Song Hocheol;Ahn Se-Woong;Park Jin-won
    • Journal of Energy Engineering
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    • v.14 no.4 s.44
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    • pp.219-225
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    • 2005
  • for the removal of carbon dioxide in flue gas, which is the main cause of the global warming, chemical absorption methods were widely used for years. Alkanolamines such as MEA, AMP, MDEA are mainly used as an absorbent. In this study, cyclic amines - Piperazine, Piperidine and Cyclohelylamine are investigated to compare the chemical solubilities, absorption capacities and rate ot reaction. In conclusion, Piperazine is the most effective absorbent of $CO_2$ and ran be the excellent alternative to the former absorbents. Experiments were performed at 5, 10, 15 weight percent, 30, 40, $50^{\circ}C$, and the gas solubilities are determined by back-titration method, and using Gas Chromatography the absorption rate was compared.

Resistive Humidity Sensor Using New N-Methacryloyl-N'-ethyl-N'-propyl Piperazinium Bromide Monomer and Their Properties (새로운 N-Methacryloyl-N'-ethyl-N'-propyl Piperazinium Bromide 단량체를 사용한 습도센서 및 그들의 특성 조사)

  • Lee, In-Ho;Park, Chan-Kyo;Gong, Myoung-Seon
    • Polymer(Korea)
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    • v.33 no.4
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    • pp.326-332
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    • 2009
  • New humidity-sensitive monomer, N-methacryloyl-N'-ethyl-N'-propyl piperazinium bromide (MANEPPB) was prepared by the quaternization reaction of N-methacryloyl-N'-ethyl piperazine (MANEP) with 1-bromopropane. Polyelectrolytes derived from the copolymers composed of MANEPPB/MMN/AA=60/35/5, 70/25/5, 80/15/5, 90/5/5 and 95/0/5 were prepared for the humidity-sensitive membranes, which were fabricated on the gold electrode by dipping method and were crosslinked by reacting copolymers with aziridine crosslinker, trimethylolpropane tris(2-methyl-1-aziridinopropionate) (TTAP). When the resistance dependences on the relative humidity of the sensors were measured, it was found that the resistance varied three orders of magnitude between 20 and 90%RH, which was satisfied with the requirement for the common humidity sensor operating at ambient humidity. Their hysteresis, temperature dependence, frequency dependence, response and recovery time and water durability were measured and evaluated as a humidity-sensing membrane.

Crystal Structure of 3-[4-(2-Ethoxy-2-phenylethyl)-1-piperazinyl]-2-methyl-1-phenyl-1-propanone (Eprazinone) dihydrochloride, $C_{24}H_{32}N_2O_2$·2HCl

  • Euisung Kim;Hyun Song;Choong-Souh Yun;Hyun-So Shin
    • Bulletin of the Korean Chemical Society
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    • v.12 no.4
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    • pp.371-373
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    • 1991
  • The crystal structure of eprazinone dihydrochloride, $C_{24}H_{32}N_2O_2$${\cdot}$2HCl, has been determined from 2102 independent reflections collected on an automated Nonious CAD-4 diffractometer using graphite-monochromated $Mo-K\alpha$ radiation. The crystals are monoclinic, space group P$2_1$/n, with unit cell dimensions a=11.381(2), b=28.318(2), c=7.840(1) $\AA$, $\beta=92.45(2)^{\circ}$, ${\mu}=2.37$ c$m^{-1}$, F(000)=968, and Z=4. Final R value is 0.071 for independent 2102 observed reflections. The molecule assumes an extended conformation. The piperazine ring has a normal chair conformation and the four carbon atom are planar with a maximum displacement of 0.004 $\AA$ for C(18) atom. The two chloride ions are hydrogen bonded to the two piperazine nitrogen atoms [N(14)${\cdot}{\cdot}{\cdot}$Cl(1); 2.986(6) $\AA$ N(17)…Cl(2); 3.084(8) $\AA$].

Absorption Characteristics of Carbon Dioxide in Aqueous AMP Solution Adding HMDA (HMDA 첨가에 따른 AMP 수용액의 이산화탄소 흡수특성)

  • Choi Won-Joon;Cho Ki-Chul;Oh Kwang-Joong
    • Journal of Korean Society for Atmospheric Environment
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    • v.21 no.6
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    • pp.605-612
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    • 2005
  • In this study, the possible use of HMDA (Hexamethylenediamine) as additive to enhance reaction between $CO_{2}$ and AMP (2-amino-2-methyl-1-propanol) which has higher absorption capacity than that of MEA (Monoethanolamine) was investigated. Also, the absorption capacity for $CO_{2}$ was compared with addition of HMDA, piperazine or MDEA (N-methyldiethanolamine) into $30\;wt\%$ AMP at $40^{circ}C$ and $CO_{2}$ partial pressure ranging from 0.5 to 120 kPa. Apparent rate constant ($K_{app}$) and absorption capacity with the addition of $5\∼20\;wt\%$ HMDA into AMP increased $214.2\∼276.3\%$ and $29.9\∼91.7\%$ than those of AMP alone. As a result, when $5\;wt\%$ HMDA added into AMP, the increasing rate of the absorption rate and the absorption capacity was found to be the highest. In addition, the absorption capacity increased $6.8\%,\;9.8\%,\;11.6\%$ with addition of MDEA, piperazine or HMDA respectively as compared to AMP alone at $CO_{2}$ partial pressure of 20 kPa. Consequently, HMDA as additive to improve absorption capacity of AMP was superior to other additives.

Studies on the Synthesis of Pterdine Substituted Pyridonecarboxylic Acids as Potential Antibacterial Agents and their Antimicrobial Activities (항균제로서 Pteridine이 치환된 Pyridonecarboxylic Acids의 합성 및 항균 작용에 관한 연구)

  • Ryu, Seoung Ryuall;Choo, Dong Joon
    • Applied Chemistry for Engineering
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    • v.7 no.6
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    • pp.1096-1104
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    • 1996
  • In order to synthesize a new antibacterial and antitumor agents, we have prepared new analogues pteroic acid(13a, 13b), which means C-9 position of pteroic acid has been replaced by norfloxacin(8) or ciprofloxacin(9) and amino group of C-2 position by $CH_3$. These derivatives were synthesized coupling at N-4 piperazine of norfloxacin and ciprofloxacin with 2-amino-3-cyano-5-chloromethylpyrazine(20) provided 1-alkyl(ethyl, cyclopropyl)-6-fluoro-1,4-dihydro-4-oxo-7-[[4-N-(2-amino-3-cyanopyrazin-5-yl)methyl]piperazin-1-yl]-3-quinoline-carboxylic acid(12a, 12b). It was then cyclized with acetamidine. HCI to obtain new analogues of C-2 desaminomethylpteroic acid(13a, 13b) in yield of 76.2% and 82.8 % respectively. These compounds were tested in vitro on antibacterial activity against Gram-positive and Gram-negative bacteria including Pseudomonas aeruginosa ATCC9027. In general, these synthesized compounds(13a, 13b) showed less potent activities than those of norfloxacin.

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Synthesis, Characterization and Antimicrobial Activity of Bifunctional Sulfonamide-Amide Derivatives

  • Abbavaram, Babul Reddy A.;Reddyvari, Hymavathi R.V.
    • Journal of the Korean Chemical Society
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    • v.57 no.6
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    • pp.731-737
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    • 2013
  • A convenient synthesis of bifunctional sulfonamide-amide derivatives was reported. Amide coupling of 4-methyl benzoic acid 1 followed by reaction with chlorosulfonic acid produce ethyl-4-(3-(chlorosulfonyl)-4-methylbenzoyl)piperazine-1-carboxylate 4. The resulted compound on further treatment with various anilines produces the title sulfonamide-amide derivatives 5a-n. The configurations of these compounds were established by elemental analysis, IR, $^1H$ NMR, mass spectra, and by their preparation from the corresponding 4-methyl benzoic acid 1 and chlorosulfonic acid. All these new compounds demonstrate significant in vitro antibacterial and antifungal activities against all bacterial and fungal strains.

Designing Hypothesis of 2-Substituted-N-[4-(1-methyl-4,5-diphenyl-1H-imidazole-2-yl)phenyl] Acetamide Analogs as Anticancer Agents: QSAR Approach

  • Bedadurge, Ajay B.;Shaikh, Anwar R.
    • Journal of the Korean Chemical Society
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    • v.57 no.6
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    • pp.744-754
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    • 2013
  • Quantitative structure-activity relationship (QSAR) analysis for recently synthesized imidazole-(benz)azole and imidazole - piperazine derivatives was studied for their anticancer activities against breast (MCF-7) cell lines. The statistically significant 2D-QSAR models ($r^2=0.8901$; $q^2=0.8130$; F test = 36.4635; $r^2$ se = 0.1696; $q^2$ se = 0.12212; pred_$r^2=0.4229$; pred_$r^2$ se = 0.4606 and $r^2=0.8763$; $q^2=0.7617$; F test = 31.8737; $r^2$ se = 0.1951; $q^2$ se = 0.2708; pred_$r^2=0.4386$; pred_$r^2$ se = 0.3950) were developed using molecular design suite (VLifeMDS 4.2). The study was performed with 18 compounds (data set) using random selection and manual selection methods used for the division of the data set into training and test set. Multiple linear regression (MLR) methodology with stepwise (SW) forward-backward variable selection method was used for building the QSAR models. The results of the 2D-QSAR models were further compared with 3D-QSAR models generated by kNN-MFA, (k-Nearest Neighbor Molecular Field Analysis) investigating the substitutional requirements for the favorable anticancer activity. The results derived may be useful in further designing novel imidazole-(benz)azole and imidazole-piperazine derivatives against breast (MCF-7) cell lines prior to synthesis.

Effects of a New Selective Phosphodiesterase Type 5 Inhibitor, KJH-1002, on the Relaxation of Rabbit Corpus Cavernosum Tissue

  • Cho, Eun-Young;Chung, Sung-Hyun;Kim, Joong-Hyup;Kim, Dong-Hyun;Jin, Cang-Bae
    • Biomolecules & Therapeutics
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    • v.11 no.4
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    • pp.232-237
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    • 2003
  • The present study examined functional effects of a new selective phosphodiesterase type 5 inhibitor, 1-[4-ethoxy-3-(6,7-dihydro-1-methyl-7-thioxo-3-propyl-1H-pyrazolo[ 4,3]pyrimidin-5-yl)phenylsulphonyl]-4-methyl piperazine (KJH-1002), in the isolated rabbit corpus cavernosum (RCC). Relaxing effects of KJH-1002 were also compared with those of sildenafil, which is currently used as an oral therapy for penile erectile dysfunction. In the isolated RCC precontracted with phenylephrine, both KJH-1002 and sildenafil in the concentration range of 1 to 1000 nM, produced a comparable potentiation of the electical field stimulation-induced relaxation in a concentration-dependent manner. In the sodium nitroprusside (SNP)-induced relaxation, the $IC_{50}$/ values, concentrations of SNP required to produce a 50% relaxation of the phenylephrine-induced contraction, were significantly decreased to the similar extent by treatments with KJH-1002 and sildenafil. The results suggest that a new selective phosphodiesterase type 5 inhibitor, KJH-1002, has an augmentative effect on penile erection comparable to that of sildenafil and can be useful for the treatment of erectile dysfunction.

Synthesis and Inhibition Effects on 5-HT6 Receptor of Benzothiazole Derivatives

  • Hayat, Faisal;Yoo, Euna;Rhim, Hyewhon;ParkChoo, Hea-Young
    • Bulletin of the Korean Chemical Society
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    • v.34 no.2
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    • pp.495-499
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    • 2013
  • A novel series of aryl sulfonylpiperazine derivatives (5-15) were synthesized as 5-$HT_6$ ligands. In vitro assay was evaluated by measuring the 5-HT-induced $Ca^{2+}$ increases using HeLa cell line expressing the cloned human 5-$HT_6$ receptor, and the compound 13 showed potent 5-$HT_6$ receptor antagonistic effect with $IC_{50}$ value of 3.9 ${\mu}M$. Compound 13 also showed good selectivity on the 5-$HT_6$ over 5-$HT_4$ and 5-$HT_7$ receptors.

Analysis of Amine Absorbents Volatility Based on the Chemical Structure (아민 흡수제의 화학구조에 따른 휘발 특성)

  • Lee, Kyung Ja;Lee, Ji Hyun;Kwak, No Sang;Lee, In Young;Kim, Jun Han;Eom, Yong Seok;Jang, Kyung Ryoung;Shim, Jae Goo;Lee, Yongtaek
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.348-352
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    • 2012
  • Amine volatility occurring on the $CO_2$ capture process may result in significant economic losses and environmental impact. In this study, using an volatility measurement apparatus, we measured a amine volatility of various amines including MEA(Monoethanolamine), MDEA(N-Methyldiethanolamine), Pz(Piperazine), AMP(2-Amino-2-methyl-1-propanol), 2-MP(2-Methylpiperazine), DGA(Diglycolamine). For the quantitative analysis of volatility, we analyzed the effects of temperature and $CO_2$ loading using an gas chromatography analysis. The result shows that the amine volatility was increased by increasing Henry's constant(MDEA$-CH_3$)(for AMP).