Synthesis of Selenium-Containing Crown Ethers and Related Compounds

Synthesis, Characterization and Coordination Chemistry of Some Selenium‐Containing Macrocyclic Schiff Bases

“…[29] Jackson and co-workers have designed and synthesized a novel macrobicyclic cage incorporating N/Se (N 3 Se 3 ) atoms and its Co III complex. [30] Meunier et al have reported the synthesis of a diselena crown ether [31] and tetraselena crown ethers of three different sizes incorporating several oxygen atoms in the bridge. [32] The complexation of these selenoethers has been achieved by their reaction with mercury(ii) iodide.…”

Tetraselena crown ethers: synthesis and complexation with mercury salts. Crystal structure of a macrocycle and a mercury(II) complex

“…It is well known that mercury(), HgX 2 , molecules have a strong tendency to form linear structures which may be deformed in the solid state by secondary Hg ؒ ؒ ؒ X interactions 1)᎐C(7) 97.5 (6), C(2)᎐Se( 2)᎐C( 14) 97.5 (5) or by their complexation to neutral molecules. These interactions may be covalent or van der Waals in nature, thus covering the geometries from pseudo-linear to nearly tetrahedral.…”

“…4 However, in general, macrocyclic ligands exhibit different co-ordination properties compared to their acyclic counterparts. 5 In parallel to our preliminary work 6 concerning diselenacrown ethers, a few examples have been recently described 7 and some of their complexes synthesized. 8 Only recently, ligands able to complex two or more different metal cations, such as transition metal and alkali metal or alkaline-earth-metal cations, in close proximity have been reported.…”

Stepwise synthesis of selenium coronands containing an odd number of selenium atoms: 1,5,9-triselenacyclododecane and 1,5,9,13,17-pentaselenacycloeicosane

“…Since our initial disclosure, we have reported the one-step syntheses of other prototype selenium coronands (6) and there There have been relatively few reports of the synthesis of selehave been reported syntheses of other macrocyclic diselena nium cOrOnands. the best Our prior Our ethers (7), selenium porphyrin derivatives (8), tetraselena-3.4-report of the serendipitous discovery of the simple selenium benzocyclooctadecane, (9) mixed selena oxa macrocyclic coronands in 1988 (1,2), the only macrocyclic seleno ethers ethers (9)(10)(11)(12), and a tetraselenacyclohexadecine bis-naphthareported were the cyclic oligomers of selenaformaldehyde (3), lene derivative (13). diselenacyclophanes (4), and a selenium porphyrin derivative It is also surprising, given the current interest in chalcogen macrocycles as models for metalloenzymes and metallopro-…”