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Application of modified clays in diazotization and azo coupling reactions in water
Alireza Najafi Chermahini,Maryam Doukheh,Hassan Zadeh Hassan,Mehdi Bostanian 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Diazotization and diazo coupling reaction of a series of aromatic amines and activated aromatic compounds over eco-friendly modified clay catalysts are described. The reaction was catalyzed by modified montmorillonite K-10 including Cu2+, Fe3+, and Zn2+ metal ions. The versatility of this method was checked by using various amines and phenols, which showed reasonable yields of products. These inexpensive, noncorrosive and reusable catalysts were found to exhibit bifunctional catalytic properties for diazotization and diazo coupling reactions. The catalysts could be reused several times without significant loss of their catalytic reactivity.
Rahimizadeh, Mohammad,Eshghi, Hossein,Shiri, Ali,Ghadamyari, Zohreh,Matin, Maryam M.,Oroojalian, Fatemeh,Pordeli, Parvaneh Korean Chemical Society 2012 대한화학회지 Vol.56 No.6
Diazo coupling reactions of aromatic amines with 2-naphthol in a green, efficient and easy procedure is described. Ferric hydrogensulfate catalyses this reaction in water at room temperature and short reaction time with high yields. The antibacterial activities of the synthesized compounds against four pathogenic bacteria are also investigated.
Moustafa, Osama S.,Badr, Mahmoud Z.A.,El-Emary, Talaat I. Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.4
Diazotization of 3-amino-2-ethoxycarbonylthieno[2,3-b]quinoxaline 1 gave the diazonium salt 2 which was reacted with SO2 and N-methylaniline to give sulfamoylquinoxaline derivatives 3-5. Imidazothienoquinoxaline 8 was obtained from the reaction of carboxylic acid hydrazide 6 with nitrous acid and followed by boilling the carboazide 7 in dry xylene. Also, compound 6 react with CH(OEt)3 to give aminopyrimidine 9 which was reacted with arylidene malonodinitrile, furfural and/or dimethoxy-tetrahydrofuran to afford compounds 10, 11 and/or 12 respectively. Refluxing of 6 with CS2 gave oxadiazolylthienoquinoxaline 13, reaction of 13 with hyrazine hydrate, CH(OEt)3, nitrous acid, CS2 and a-halocompounds to give 14-19.
Lee, Keunsik,Yoon, Yeoheung,Cho, Yunhee,Lee, Sae Mi,Shin, Yonghun,Lee, Hanleem,Lee, Hyoyoung American Chemical Society 2016 ACS NANO Vol.10 No.7
<P>Although there are numerous reports of high performance supercapacitors with porous graphene, there are few reports to control the interlayer gap between graphene sheets with conductive molecular linkers (or molecular pillars) through a pi-conjugated chemical carbon-carbon bond that can maintain high conductivity, which can explain the enhanced capacitive effect of supercapacitor mechanism about accessibility of electrolyte ions. For this, we designed molecularly gap-controlled reduced graphene oxides (rGOs) via diazotization of three different phenyl, biphenyl, and para-terphenyl bis-diazonium salts (BD1-3). The graphene interlayer sub-nanopores of rGO-BD1-3 are 0.49, 0.7, and 0.96 nm, respectively. Surprisingly, the rGO-BD2 0.7 nm gap shows the highest capacitance in 1 M TEABF(4) having 0.68 nm size of cation and 6 M KOH having 0.6 nm size of hydrated cation. The maximum energy density and power density of the rGO-BD2 were 129.67 W h kg(-1) and 30.3 kW kg(-1), respectively, demonstrating clearly that the optimized sub-nanopore of the rGO-BDs corresponding to the electrolyte ion size resulted in the best capacitive performance.</P>
Synthesis of Some Biologically Active Halogenopurines
Hu, Yu Lin,Liu, Xiang,Lu, Ming,Ge, Qiang,Liu, Xiao Bin Korean Chemical Society 2010 대한화학회지 Vol.54 No.4
A series of some biologically active halogenopurines were synthesized from commercially available guanine (1). The reaction of guanine with acetic anhydride yielded 2,9-diacetylguanine (2-1) by acetylation reaction. Further treatment of 2-1 with $POCl_3$ by PEG-2000 phase transfer catalysis furnished the important compound 3a, then 2-amino-6-halogenopurines (3b-d) were obtained through chlorine-exchange halogenations between KX and 3a by TPPB phase transfer catalyst. Further, 2-halogenopurines (2-2a-d, 4-2a-d, 5a-d) were efficiently prepared from 2-amino-6-substituted purines (1, 3a, 4-1) via a diazotization catalyzed by their corresponding CuX, and some new compounds 2-2a, 2-2c, 2-2d, 4-2c, 4-2d, 5b, 5c and 5d have been discovered. The structures of synthesized compounds were mainly established on the basis of their elemental analysis, $^1H$ NMR, as well as their mass spectral data. All the title compounds were screened for their antifungal activities, and some of the compounds showed promising activity. Guanine (1)으로부터 생물활성이 있는 halogenopurines계 화합물을 합성하였다. Guanine을 acetic anhydride와 반응시켜서 2,9-diacetylguanine (2-1)을 합성하여 얻어진 화합물을 $POCl_3$와 반응시켜서 화합물 3a를 합성하고, 다음 단계에서 2-amino-6-halogenopurines (3b-d)를 합성하였다. 2-Halogenopurines (2-2a-d, 4-2a-d, 5a-d)을 2-amino-6-substituted purines (1, 3a, 4-1)로부터 효율적으로 합성한 후에, 새로운 화합물인 2-2a, 2-2c, 2-2d, 4-2c, 4-2d, 5b, 5c 및 5d를 합성하였다. 합성한 화합물의 구조를 원소분석, $^1H$ NMR, mass spectral data로 확인하였으며, 합성한 화합물에 대한 항균 활성을 시험하였다.
맹찬영,고기훈,이경섭,노희찬,박대수,이필호 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.8
Reaction of B(4)‐acylmethyl o ‐carborane with 2‐azido‐1,3‐dimethylimidazolinium hexafluorophosphate (ADMP) in the presence of 1,8‐diazabicyclo[5.4.0]‐undec‐7‐ene (DBU) in acetonitrile at 25 °C for 3 h produced a wide range of o ‐carboranyl‐acyl‐substituted diazo compounds in high yields with good functional group tolerance.
암모니아 산화 세균 Xanthomonas maltophilia SU6 와 Achromobacter sp. 12A에 의한 nitrite 생성의 비교
최미경,한효영,정영희,민경희 숙명여자대학교 환경과학연구소 1995 환경과학 Vol.2 No.-
암모니아를 NO_2^-로 산화, 이용하는 미생물 균주들을 한강 주변의 토양에서 분리하였으며, 이들은 Xanthomonas maltophilia SU6와 Achromobacter sp. 12A로 동정하였다. 이 균주들을 암모니아가 첨가된 액체 최소 배지에서 2주 동안 배양한 후, 생성되는 NO_2^-의 양을 측정하여 암모니아 산화의 활성을 조사하였다. 생장 최적 pH는 Xanthomonas maltophilia SU6 와 Achromobacter sp. 12A 균주가 7.0-8.0 이었으며, 생장에 필요한 무기질소원으로서 NH_4Cl 의 최적 기질 농도는 두 균주가 모두 10mM 이었다. 암모니아 산화 균주의 활성을 높이기 위하여 Xanthomonas maltophilia SU6와 Achromobacter sp. 12A를 12시간 배양한 후에 50mM의 hydroxylamine을 배지에 첨가하였을 때 각각 467㎍/1, 641㎍/1 의 NO_2^-를 유도 생성하였다. Hydroxylamine oxidase 의 활성에 미치는 기질의 영향을 규명하기 위하여 Xanthomonas maltophilia SU6 와 Achromobacter sp. 12A를 8시간 동안 암모니아가 포함된 최소배지에서 배양한 후에, hydroxylamine 을 첨가한 결과 hydroxylamine oxidase 의 비활성은 109units/㎎ protein 와 132 units/㎎ protein 으로 증가하였다. Hydroxylamine oxidase 의 최적 pH는 7.5, 최적 온도는 30℃ 였으며, 열에 대한 안정성에서는 Xanthomonas maltophilia SU6 와 Achromobacter sp. 12A 는 50℃, 60분에서 각각 30%와 25%의 안정성을 보여주었다.