Synthesis of electron-poor N-Vinylimidazole derivatives catalyzed by Silica nanoparticles under solvent-free conditions

International Journal of Nano Dimension

مقاله 5، دوره 7، شماره 1، فروردین 2016، صفحه 41-48   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.7508/ijnd.2016.01.005

نویسندگان

A. Ramazani^{* 1}؛ A. Farshadi²؛ A. Mahyari³؛ F. Sadri⁴؛ S. W. Joo⁵؛ P. Azimzadeh Asiabi⁶؛ S. Taghavi Fardood¹؛ N. Dayyani¹؛ H. Ahankar^{1، 7}

¹Department of Chemistry, University of Zanjan, P O Box 45195-313, Zanjan, Iran

²Department of Chemistry, Islamshahr Branch, Islamic Azad University, Tehran, Iran

³Young Researchers Club, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran

⁴Department of Chemistry, Payame Noor University, P O BOX19395-4697 Tehran, Iran

⁵School ofMechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea

⁶Nuclear Science and Technology Research Institute, P.O Box 11365-3486, Tehran, Iran

⁷Department of Chemistry, Abhar Branch, Islamic Azad University, P O Box 22, Abhar, Iran

چکیده

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by thermal decomposition of rice hulls) was found to catalyze the conversion of the phosphorus ylides to electron-poor N-vinyl imidazoles in solvent-free conditions under thermal (90◦C, 30 min) conditions. It may be speculated that the polar amphoteric surface (OH groups of the silica NPs) facilitates the interaction of adsorbed weak acidic and basic components due to stabilization of the corresponding transition states and intermediates by H-bonding. It seems that the interactions with the neighboring silanol groups are plausible factors in the rate acceleration. Participation of two proximate silanol groups (one as an H-bond donor and the other as an H-bond acceptor) in the reaction mechanism also seems to be plausible.

کلیدواژه‌ها

Acetylenic Esters؛ N-Vinyl Imidazole؛ Phosphorus ylides؛ Silica Nanoparticles؛ Solvent-free conditions؛ Vinyltriphenylphosphonium salts

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