Pure and Applied Chemistry

CrossRef Cited-by Linking

• Srivani A., Parameswaram G., Sai Prasad P. S., Lingaiah N.: Metal exchanged heteropolytungstate: an efficient catalyst for the synthesis of formylated amines. Reac Kinet Mech Cat 2014. <http://dx.doi.org/10.1007/s11144-014-0702-6>
• Sani Yahaya Muhammad, Daud Wan Mohd Ashri Wan, Abdul Aziz A.R.: Activity of solid acid catalysts for biodiesel production: A critical review. Applied Catalysis A: General 2014, 470, 140. <http://dx.doi.org/10.1016/j.apcata.2013.10.052>
• Bamoharram Fatemeh F., Heravi Majid M., Ebrahimi Javad, Tavakoli-Hoseini Nilofar: Esterification of Salicylic Acid Using Brønsted Acidic Ionic Liquid based on Keggin Heteropoly Acid. Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry 2014, 44, 36. <http://dx.doi.org/10.1080/15533174.2013.768639>
• Op de Beeck Beau, Geboers Jan, Van de Vyver Stijn, Van Lishout Jonas, Snelders Jeroen, Huijgen Wouter J. J., Courtin Christophe M., Jacobs Pierre A., Sels Bert F.: Conversion of (Ligno)Cellulose Feeds to Isosorbide with Heteropoly Acids and Ru on Carbon. ChemSusChem 2013, 6, 199. <http://dx.doi.org/10.1002/cssc.201200610>
• Liu Yan, Liu Chun-Ling, Wu Hai-Zhen, Dong Wen-Sheng: An Efficient Catalyst for the Conversion of Fructose into Methyl Levulinate. Catal Lett 2013, 143, 1346. <http://dx.doi.org/10.1007/s10562-013-1094-3>
• Sani Yahaya Muhammad, Daud Wan Mohd Ashri Wan, Abdul Aziz A.R.: Solid acid-catalyzed biodiesel production from microalgal oil—The dual advantage. Journal of Environmental Chemical Engineering 2013, 1, 113. <http://dx.doi.org/10.1016/j.jece.2013.04.006>
• Anjibabu R., Sau Samaresh, Reddy B. Jagan Mohan, Banerjee Rajkumar, Reddy B.V. Subba: Heteropoly acid catalyzed synthesis of 8-methyl-2-aryl/alkyl-3-oxabicyclo[3.3.1]non-7-ene derivatives through (3,5)-oxonium-ene reaction. Tetrahedron Letters 2013, 54, 7160. <http://dx.doi.org/10.1016/j.tetlet.2013.10.103>
• Hsu Keng-Chang, Sun Chien-Che, Ling Yong-Chien, Jiang Shiuh-Jen, Huang Yeou-Lih: An on-line microfluidic device coupled with inductively coupled plasma mass spectrometry for chromium speciation. J. Anal. At. Spectrom. 2013, 28, 1320. <http://dx.doi.org/10.1039/c3ja50030f>
• Bamoharram Fatemeh F., Heravi Majid M., Omidinia Raheleh, Tavakoli-Hoseini Niloofar: Tetrabutylammoniumhexatungstate (VI), [(n-C4H9)4N]2[W6O19] : As a Green and Recylable Isopolyanion Catalyst in Oxidation of Benzaldehydes. Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry 2013, 43, 125. <http://dx.doi.org/10.1080/15533174.2012.680122>
• Heravi Majid M., Vazin Fard Mahdiyeh, Faghihi Zeinab: Heteropoly acids-catalyzed organic reactions in water: doubly green reactions. Green Chemistry Letters and Reviews 2013, 6, 282. <http://dx.doi.org/10.1080/17518253.2013.846415>
• Yan Shiqiang, Ding Ning, Zhang Wei, Wang Peng, Li Yingxia, Li Ming: An efficient and recyclable catalyst for the cleavage of tert-butyldiphenylsilyl ethers. Carbohydrate Research 2012, 354, 6. <http://dx.doi.org/10.1016/j.carres.2012.02.021>
• Masteri-Farahani M., Movassagh J., Taghavi F., Eghbali P., Salimi F.: Magnetite–polyoxometalate hybrid nanomaterials: Synthesis and characterization. Chemical Engineering J 2012, 184, 342. <http://dx.doi.org/10.1016/j.cej.2011.12.094>
• Ciftci Aysegul, Varisli Dilek, Cem Tokay Kenan, Aslı Sezgi N., Dogu Timur: Dimethyl ether, diethyl ether & ethylene from alcohols over tungstophosphoric acid based mesoporous catalysts. Chemical Engineering Journal 2012, 207-208, 85. <http://dx.doi.org/10.1016/j.cej.2012.04.016>
• Shin Hee-Yong, An Seung-Hwan, Sheikh Rizwan, Park Yeung Ho, Bae Seong-Youl: Transesterification of used vegetable oils with a Cs-doped heteropolyacid catalyst in supercritical methanol. Fuel 2012, 96, 572. <http://dx.doi.org/10.1016/j.fuel.2011.12.076>
• Fernandes Sergio Antonio, Cardoso Abiney Lemos, da Silva Márcio José: A novel kinetic study of H3PW12O40 - catalyzed oleic acid esterification with methanol via 1H NMR spectroscopy. Fuel Proc Techn 2012, 96, 98. <http://dx.doi.org/10.1016/j.fuproc.2011.12.025>
• Masteri-Farahani M., Shahbazi S.: Preparation of Keggin-type polyoxometalate hybrid nanomaterial with one pot multicomponent reaction in reverse micelle nanoreactors. J Inorg Chem Commun 2012, 15, 297. <http://dx.doi.org/10.1016/j.inoche.2011.11.007>
• Subba Reddy B.V., Narasimhulu G., Subba Lakshumma P., Vikram Reddy Y., Yadav J.S.: Phosphomolybdic acid: a highly efficient solid acid catalyst for the synthesis of trans-4,5-disubstituted cyclopentenones. Tetrahedron Letters 2012, 53, 1776. <http://dx.doi.org/10.1016/j.tetlet.2012.01.115>
• Lv Hongjin, Geletii Yurii V., Zhao Chongchao, Vickers James W., Zhu Guibo, Luo Zhen, Song Jie, Lian Tianquan, Musaev Djamaladdin G., Hill Craig L.: Polyoxometalate water oxidation catalysts and the production of green fuel. Chem. Soc. Rev. 2012, 41, 7572. <http://dx.doi.org/10.1039/c2cs35292c>
• Gharib Ali, Jahangir Manouchehr, Roshani Mina, Scheeren J. (Hans) W.: Catalytic Synthesis of Fused 1,4-Dihydropyridines and 1,4-Dihydropyridine Derivatives Using Preyssler Heteropolyacids Catalyst. Synthetic Communications 2012, 42, 3311. <http://dx.doi.org/10.1080/00397911.2011.581405>
• Sharma Yogesh C., Singh Bhaskar, Korstad John: Advancements in solid acid catalysts for ecofriendly and economically viable synthesis of biodiesel. Biofuels Bioprod Bioref 2011, 5, 69. <http://dx.doi.org/10.1002/bbb.253>
• Emer Enrico, Sinisi Riccardo, Capdevila Montse Guiteras, Petruzziello Diego, De Vincentiis Francesco, Cozzi Pier Giorgio: Direct Nucleophilic SN1-Type Reactions of Alcohols. Eur J Org Chem 2011, 2011, 647. <http://dx.doi.org/10.1002/ejoc.201001474>
• Fan Chunyan, Guan Hongyu, Zhang Hang, Wang Jianghua, Wang Shengtian, Wang Xiaohong: Conversion of fructose and glucose into 5-hydroxymethylfurfural catalyzed by a solid heteropolyacid salt. Biomass and Bioenergy 2011, 35, 2659. <http://dx.doi.org/10.1016/j.biombioe.2011.03.004>
• Saenz Lina R., Carreto-Vazquez Victor H., Rogers William J., Papadaki Maria, Mannan M. Sam: Thermal decomposition of 2-methylpyridine N-oxide: Effect of temperature and influence of phosphotungstic acid as the catalyst. Catal Commun 2011, 12, 1370. <http://dx.doi.org/10.1016/j.catcom.2011.03.036>
• Heravi Majid M., Bamoharram Fatemeh F., Tavakoli-Hoseini Niloofar: Generation of Brønsted Acidic Ionic Liquid by Keggin Heteropoly Acid and its Application in the Synthesis of 14-Aryl-14H-dibenzo[a,j]xanthenes. Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry 2011, 41, 616. <http://dx.doi.org/10.1080/15533174.2011.568449>
• Rafiee Ezzat, Khodayari Maryam, Joshaghani Mohammad: Direct benzylation of 1,3-dicarbonyl compounds catalyzed by Cs_2.5H_0.5PW₁₂O₄₀ in solvent-free conditions. Can J of Chem 2011, 89, 1533. <http://dx.doi.org/10.1139/v11-134>
• Aouissi Ahmed: Cationic polymerization of 2,3-dihydro-4H-pyran using 12-tungstophosphoric acid as a solid acid catalyst. J Appl Polym Sci 2010, NA. <http://dx.doi.org/10.1002/app.31967>
• Godói Silva Vinícius Wilker, Laier Letícia Oliveira, Silva Márcio José da: Novel H3PW12O40: Catalysed Esterification Reactions of Fatty Acids at Room Temperature for Biodiesel Production. Catal Lett 2010, 135, 207. <http://dx.doi.org/10.1007/s10562-010-0294-3>
• Ruiz Diego M., Romanelli Gustavo P., Vázquez Patricia G., Autino Juan C.: Preyssler catalyst: An efficient catalyst for esterification of cinnamic acids with phenols and imidoalcohols. CATAL A GENERAL 2010, 374, 110. <http://dx.doi.org/10.1016/j.apcata.2009.11.037>
• Strigul Nikolay: Does speciation matter for tungsten ecotoxicology?. Ecotoxicology and Environmental Safety 2010, 73, 1099. <http://dx.doi.org/10.1016/j.ecoenv.2010.05.005>
• Fontananova Enrica, Trotta Francesco, Jansen Johannes C., Drioli Enrico: Preparation and characterization of new non-fluorinated polymeric and composite membranes for PEMFCs. J Membr Sci 2010, 348, 326. <http://dx.doi.org/10.1016/j.memsci.2009.11.020>
• Srivani A., Venkateswar Rao K.T., Sai Prasad P.S., Lingaiah N.: An efficient synthesis of benzoxazoles using silica-supported tin exchanged silicotungstic acid catalyst. Journal of Molecular Catalysis A 2010, 328, 119. <http://dx.doi.org/10.1016/j.molcata.2010.06.009>
• Murugan Kaliyappan, Srimurugan Sankareswaran, Chen Chinpiao: A mild, catalytic and efficient Nazarov cyclization mediated by phosphomolybdic acid. Chem Commun 2010, 46, 1127. <http://dx.doi.org/10.1039/b918137g>
• Heravi Majid M., Sadjadi Samaheh, Haj Negar Mokhtari, Oskooie Hossein A., Bamoharram Fatemeh F.: Efficient Three-Component Synthesis of 4-Aminoquinazolines. Synth Comm 2010, 40, 861. <http://dx.doi.org/10.1080/00397910903019967>
• Kadam Santosh T., Lee Hanbin, Kim Sung Soo: Direct coupling reaction between alcohols and allyltrimethylsilane catalyzed by phosphomolybdic acid. Appl Organometal Chem 2009, n/a. <http://dx.doi.org/10.1002/aoc.1527>
• Keri Rangappa S., Hosamani Kallappa M., Seetharama Reddy Harisha R.: A Solvent-Free Synthesis of Coumarins Using Phosphotungstic Acid as Catalyst. Catal Lett 2009, 131, 321. <http://dx.doi.org/10.1007/s10562-009-9940-z>
• Keri Rangappa S., Hosamani Kallappa M., Seetharama Reddy Harisha R., Shingalapur Ramya V.: Wells–Dawson Heteropolyacid: An Efficient Recyclable Catalyst for the Synthesis of Benzimidazoles Under Microwave Condition. Catal Lett 2009, 131, 552. <http://dx.doi.org/10.1007/s10562-009-9966-2>
• Yadav J.S., Reddy B.V. Subba, Chaya D.N., Kumar G.G.K.S. Narayana, Naresh P., Jagadeesh B.: Heteropoly acid-catalyzed aza-Prins-cyclization: an expeditious synthesis of 4-hydroxypiperidines. Tetrahetron Lett 2009, 50, 1799. <http://dx.doi.org/10.1016/j.tetlet.2009.01.148>
• Li Kexin, Hu Jianglei, Li Wei, Ma Fengyan, Xu Leilei, Guo Yihang: Design of mesostructured H3PW12O40-silica materials with controllable ordered and disordered pore geometries and their application for the synthesis of diphenolic acid. J Mater Chem 2009, 19, 8628. <http://dx.doi.org/10.1039/b910416j>
• Ninomiya Wataru, Sadakane Masahiro, Matsuoka Shinji, Nakamura Hiroki, Naitou Hiroyuki, Ueda Wataru: An efficient synthesis of α-acyloxyacrylate esters as candidate monomers for bio-based polymers by heteropolyacid-catalyzed acylation of pyruvate esters. Green Chem 2009, 11, 1666. <http://dx.doi.org/10.1039/b914515j>
• Bamoharram Fatemeh F., Heravi Majid M., Roshani Mina, Mir Hamzeh: Catalytic Performance of Divanadium-Substituted Molybdophosphate Acid, H₅PMo₁₀V₂O₄₀, in Liquid-Phase Esterification of Hexanoic Acid. Phosphorus Sulfur Silicon Relat Elem 2009, 184, 3119. <http://dx.doi.org/10.1080/10426500802625784>
• Bhatt Nikunj, Patel Anjali: Nonaqueous isopropylation and sec-butylation of phenol over supported 12-tungstosilicic acid. Kinet Catal 2009, 50, 401. <http://dx.doi.org/10.1134/S0023158409030100>
• Wang Guan-Wu, Shen Ye-Bing, Wu Xue-Liang: Phosphotungstic Acid Catalyzed Amidation of Alcohols. Eur J Org Chem 2008, 2008, 4367. <http://dx.doi.org/10.1002/ejoc.200800413>
• Wang Guan-Wu, Shen Ye-Bing, Wu Xue-Liang: Phosphotungstic Acid Catalyzed Direct Benzylation of β-Dicarbonyl Compounds. Eur J Org Chem 2008, 2008, 4999. <http://dx.doi.org/10.1002/ejoc.200800624>
• Kumar Ponminor Senthil, Kumar Gaddale Devanna Kishore, Baskaran Sundarababu: Truly Catalytic and Chemoselective Cleavage of Benzylidene Acetal with Phosphomolybdic Acid Supported on Silica Gel. Eur J Org Chem 2008, 2008, 6063. <http://dx.doi.org/10.1002/ejoc.200800963>
• Cardoso Abiney L., Augusti Rodinei, Silva Márcio J.: Investigation on the Esterification of Fatty Acids Catalyzed by the H3PW12O40 heteropolyacid. J Amer Oil Chem Soc 2008, 85, 555. <http://dx.doi.org/10.1007/s11746-008-1231-0>
• Yadav J.S., Reddy B.V. Subba, Reddy A. Srinivas: Phosphomolybdic acid-supported silica gel as efficient and cost-effective solid acid for the benzylation of indoles with benzylic alcohols. Journal of Molecular Catalysis A 2008, 280, 219. <http://dx.doi.org/10.1016/j.molcata.2007.10.004>
• Yadav J.S., Reddy B.V. Subba, Purnima K.V., Nagaiah K., Lingaiah N.: Cu-exchanged phosphotungestic acid: An efficient and reusable heteropoly acid for the cyclopropanation of alkenes via C-H insertion. Journal of Molecular Catalysis A 2008, 285, 36. <http://dx.doi.org/10.1016/j.molcata.2007.12.029>
• Yadav J.S., Reddy B.V. Subba, Aravind S., Kumar G.G.K.S. Narayana, Madhavi C., Kunwar A.C.: Three-component, one-pot diastereoselective synthesis of 4-amidotetrahydropyrans via the Prins–Ritter reaction sequence. Tetrahedron 2008, 64, 3025. <http://dx.doi.org/10.1016/j.tet.2008.01.038>
• Yadav J.S., Subba Reddy B.V., Pandurangam T., Raghavendra Rao K.V., Praneeth K., Narayana Kumar G.G.K.S., Madavi C., Kunwar A.C.: Heteropoly acid-catalyzed highly efficient alkylation of 1,3-dicarbonyl compounds with benzylic and propargylic alcohols. Tetrahetron Lett 2008, 49, 4296. <http://dx.doi.org/10.1016/j.tetlet.2008.04.126>
• Wang Guan-Wu, Shen Ye-Bing, Wu Xue-Liang, Wang Lei: Solvent-free hydroalkylation of olefins with 1,3-diketones catalyzed by phosphotungstic acid. Tetrahetron Lett 2008, 49, 5090. <http://dx.doi.org/10.1016/j.tetlet.2008.06.029>
• Srihari P., Shyam Sunder Reddy J., Bhunia Dinesh C., Mandal S. S., Yadav J. S.: PMA‐SiO₂: A Heterogenous Catalyst for O‐, S‐, and N‐Nucleophilic Substitution Reactions of Aryl Propargyl Alcohols. Synth Comm 2008, 38, 1448. <http://dx.doi.org/10.1080/00397910801914335>
• Kumar M. Anil, Krishna A. Bala, Babu B. Hari, Reddy C. Bhupendra, Reddy C. Suresh: Phosphomolybdic Acid/SiO₂ as Heterogeneous Solid Acid Catalyst for the Rapid Synthesis of N-Substituted Pyrroles. Synth Comm 2008, 38, 3456. <http://dx.doi.org/10.1080/00397910802157843>
• Yadav J. S., Subba Reddy B. V., Pandurangam T., Subba Reddy U. V.: Heteropoly Acid as Efficient, Cost-effective, and Recyclable Solid Acid for the Rapid Synthesis of Substituted Imidazolines. Chem Lett 2008, 37, 824. <http://dx.doi.org/10.1246/cl.2008.824>
• Dias José A., Rangel Maria do Carmo, Dias Sílvia C.L., Caliman Ednéia, Garcia Fillipe A.C.: Benzene transalkylation with C9+ aromatics over supported 12-tungstophosphoric acid on silica catalysts. CATAL A GENERAL 2007, 328, 189. <http://dx.doi.org/10.1016/j.apcata.2007.06.007>
• Reddy Benjaram M., Patil Meghshyam K., Reddy Gunugunuri K., Reddy Baddam T., Rao Komateedi N.: Selective tert-butylation of phenol over molybdate- and tungstate-promoted zirconia catalysts. CATAL A GENERAL 2007, 332, 183. <http://dx.doi.org/10.1016/j.apcata.2007.07.026>
• Das Biswanath, Reddy V. Saidi, Ramu R.: A rapid and high-yielding synthesis of β-hydroxyselenides by regio- and stereoselective ring-opening of epoxides with benzeneselenol using ammonium-12-molybdophosphate. Journal of Molecular Catalysis A 2007, 263, 276. <http://dx.doi.org/10.1016/j.molcata.2006.08.091>
• Das Biswanath, Reddy V. Saidi, Ramu R.: A facile regio- and stereoselective synthesis of β-aminosulfides from aziridines using ammonium-12-molybdophosphate. Journal of Molecular Catalysis A 2007, 266, 40. <http://dx.doi.org/10.1016/j.molcata.2006.10.036>
• Das Biswanath, Reddy Vtukuri Saidi, Krishnaiah Maddeboina, Rao Yerra Koteswara: Highly regio- and stereoselective ring-opening of epoxides and aziridines with sodium azide using ammonium-12-molybdophosphate. Journal of Molecular Catalysis A 2007, 270, 89. <http://dx.doi.org/10.1016/j.molcata.2007.01.040>
• Yadav J. S., Reddy B. V. Subba, Rao T. Srinivasa, Krishna B. Bala. M., Kumar G. G. K. S. Narayana: Heteropoly Acid-catalyzed Direct Substitution of 2-Propynyl Alcohols with Sulfonamides. Chem Lett 2007, 36, 1472. <http://dx.doi.org/10.1246/cl.2007.1472>
• Dias Ana S., Lima Sérgio, Pillinger Martyn, Valente Anabela A.: Acidic cesium salts of 12-tungstophosphoric acid as catalysts for the dehydration of xylose into furfural. Carbohydrates Research 2006, 341, 2946. <http://dx.doi.org/10.1016/j.carres.2006.10.013>
• Das Biswanath, Reddy V. Saidi, Ramu R., Kumar D. Nandan: A rapid regioselective ring-opening of aziridines with potassium thiocyanate using ammonium-12-molybdophosphate. Catal Commun 2006, 7, 997. <http://dx.doi.org/10.1016/j.catcom.2006.05.007>
• Das Biswanath, Saidi Reddy V., Ramu R.: A rapid and high-yielding synthesis of thiazoles and aminothiazoles using ammonium-12-molybdophosphate. Journal of Molecular Catalysis A 2006, 252, 235. <http://dx.doi.org/10.1016/j.molcata.2006.02.065>
• Das Biswanath, Reddy V. Saidi, Thirupathi P.: An improved protocol for regioselective ring opening of aziridines with tetrabutylammonium halides using ammonium-12-molybdophosphate as a catalyst. Journal of Molecular Catalysis A 2006, 255, 28. <http://dx.doi.org/10.1016/j.molcata.2006.03.044>
• Nagaiah K., Sreenu D., Rao R. Srinivasa, Vashishta G., Yadav J.S.: Phosphomolybdic acid-catalyzed efficient one-pot three-component aza-Diels–Alder reactions under solvent-free conditions: a facile synthesis of trans-fused pyrano- and furanotetrahydroquinolines. Tetrahetron Lett 2006, 47, 4409. <http://dx.doi.org/10.1016/j.tetlet.2006.04.085>
• Das Biswanath, Reddy V. Saidi, Tehseen Fouzia: A mild, rapid and highly regioselective ring-opening of epoxides and aziridines with acetic anhydride under solvent-free conditions using ammonium-12-molybdophosphate. Tetrahetron Lett 2006, 47, 6865. <http://dx.doi.org/10.1016/j.tetlet.2006.07.055>
• Clark James H., Macquarrie Duncan J., Tavener Stewart. J.: The application of modified mesoporous silicas in liquid phase catalysis. Dalton Trans 2006, 4297. <http://dx.doi.org/10.1039/b607831a>
• Jafarzadeh Mohammad, Amani Kamal, Nikpour Farzad: Solvent-free and room temperature synthesis of thiochromans in the presence of a catalytic amount of tungstophosphoric acid. Tetrahetron Lett 2005, 46, 7567. <http://dx.doi.org/10.1016/j.tetlet.2005.08.156>
• Jafarzadeh Mohammad, Amani Kamal, Nikpour Farzad: Effective and regioselective iodination of arenes using iron(III) nitrate in the presence of tungstophosphoric acid. Can J Chem 2005, 83, 1808. <http://dx.doi.org/10.1139/v05-187>
• Zhang Yongqiang, Du Zexue, Min Enze: Effect of acidity and structures of supported tungstophosphoric acid on its catalytic activity and selectivity in liquid phase synthesis of ethylbenzene. Catal Today 2004, 93-95, 327. <http://dx.doi.org/10.1016/j.cattod.2004.06.011>
• Sharma Pankaj, Vyas Samir, Patel Anjali: Heteropolyacid supported onto neutral alumina: characterization and esterification of 1° and 2° alcohol. Journal of Molecular Catalysis A 2004, 214, 281. <http://dx.doi.org/10.1016/j.molcata.2003.12.038>
• Matsuhashi Hiromi, Yamagata Keiko, Arata Kazushi: Distinction of Acid-type on Solid Acid Surface by Comparison of Adsorption Heats of Nitrogen and Argon. Chem Lett 2004, 33, 554. <http://dx.doi.org/10.1246/cl.2004.554>
• Dias José A, Caliman Ednéia, Dias Sı́lvia C.L, Paulo Mônica, de Souza Antonio Thyrso C.P: Preparation and characterization of supported H3PW12O40 on silica gel: a potential catalyst for green chemistry processes. Catal Today 2003, 85, 39. <http://dx.doi.org/10.1016/S0920-5861(03)00192-5>
• Okuhara Toshio: Microporous heteropoly compounds and their shape selective catalysis. CATAL A GENERAL 2003, 256, 213. <http://dx.doi.org/10.1016/S0926-860X(03)00401-0>
• Misono Makoto, Ono Izumi, Koyano Gaku, Aoshima Atsushi: ChemInform Abstract: Heteropolyacids. Versatile Green Catalysts Usable in a Variety of Reaction Media. ChemInform 2001, 32, no. <http://dx.doi.org/10.1002/chin.200103240>