Synthesis, characterization, and X‐ray crystallographic structure of 1,3‐dimethyl‐2(3<i>H</i>)‐<i>imidazoleselone</i>

Abstract

Abstract The reaction of elemental Se with 1,3‐dimethylimidazolium iodide in methanolic K 2 CO 3 yields 1,3‐dimethyl‐2(3H)‐imidazoleselone for which three addition products, two with bromine and one with iodomethane, have been synthesized and for which X‐ray crystallographic analysis shows the structure to consist of a selenium‐substituted planar heterocyclic ring with bond distances and angles significantly different from those noted for the previously reported sulfur analog [1,3‐dimethyl‐2(3H)‐imidazolethione, dmit]. Crystal data: C 5 H 8 N 2 Se, space group C mcm, M = 175.03, a = 8.625(3), b = 11.447(6), c = 6.900(4) Å, V = 681.24 Å 3 , Z = 4, D c = 1.707 g cm −3 , D 0 = 1.68 g cm −3 , λ = 0.71073 Å (Mo‐K α ), μ = 5.35 mm −1 , R = 0.034, and R w = 0.031.