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Ultra-high pressure direct syntheses of bis(imidazolium-3-yl)alkane dichlorides

Harwood, L. M., Pitt, P., Scott, J. L. and Sousa, D. (2019) Ultra-high pressure direct syntheses of bis(imidazolium-3-yl)alkane dichlorides. Tetrahedron, 75 (44). 130639. ISSN 0040-4020

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To link to this item DOI: 10.1016/j.tet.2019.130639

Abstract/Summary

The ultra-high pressure Menshutkin reaction of N-substituted imidazoles and α,ω-dichloroalkanes provides access to a wide variety of bis(imidazoliumyl)alkane dichlorides in an efficient, one-pot process. Although the substitution reactions of dichloromethane at ambient pressure can be exceedingly slow, at 1.9 GPa, syntheses are usually quantitative in under 24 h. Reactions involving congested imidazole starting materials, that otherwise terminate after formation of the mono-imidazolium salt, are driven to the bis-imidazolium salt at 1.9 GPa. The rates of reaction increase with α,ω-dichloroalkane chain length, decrease with increasing bulk and imidazole N-substituent length, and the reactions of the more hindered imidazoles are more sensitive to the pressure-rate enhancement.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:86833
Publisher:Elsevier

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