1. Synthesis and crystal structures of two 1,3-di(alk-yloxy)-2-(methyl-sulfan-yl)imidazolium tetra-fluorido-borates.
- Author
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Gelbrich T, Lampl M, Laus G, Kahlenberg V, Huppertz H, and Schottenberger H
- Abstract
Two salts were prepared by methyl-ation of the respective imidazoline-2-thione at the sulfur atom, using Meerwein's salt (tri-methyl-oxonium tetra-fluorido-borate) in CH
2 Cl2 . 1,3-Dimeth-oxy-2-(methyl-sulfan-yl)imidazolium tetra-fluorido-borate ( 1 ), C6 H11 N2 O2 S+ ·BF4 - , displays a syn conformation of its two meth-oxy groups relative to each other whereas the two benz-yloxy groups present in 1,3-dibenz-yloxy-2-(methyl-sulfan-yl)imidazolium tetra-fluorido-borate ( 2 ), C18 H19 N2 O2 S+ ·BF4 - , adopt an anti conformation. In the mol-ecules of 1 and 2 , the methyl-sulfanyl group is rotated out of the plane of the respective heterocyclic ring. In both crystal structures, inter-molecular inter-actions are dominated by C-H⋯F-B contacts, leading to three-dimensional networks. The tetra-fluorido-borate counter-ion of 2 is disordered over three orientations (occupancy ratio 0.42:0.34:0.24), which are related by rotation about one of the B-F bonds., (© Gelbrich et al. 2020.)- Published
- 2020
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