Attempts to Synthesize a Thiirane, Selenirane, and Thiirene by Dealkylation of Chalcogeniranium and Thiirenium Salts
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Thiiranium salts [Ad SR] X (5, 8, 9, 11, 12; X =Tf N (Tf=CF SO ), SbCl ) and seleniranium salts [Ad SeR] X (14, 16, 17, 23-25; X =Tf N , BF , CHB Cl , SbCl ) are synthesized from strained alkene bis(adamantylidene) (1). The disulfides and the diselenides (Me SiCH CH E) (4, 13), (tBuMe SiCH CH E) (7, 22), and (NCCH CH E) (10, 15; E=S, Se) have been used. The thiirenium salts [tBu C SR] X (34) and [Ad C SR] X (35, 36) are prepared from the bis-tert-butylacetylene (2) and bis-adamantyl-acetylene (3) with R=Me SiCH CH and tBuMe SiCH CH . Attempts to cleave off the groups Me SiCH CH , tBuMe SiCH CH , and NCCH CH resulted in thiiranes 27, 30. No selenirane Ad Se (33) is formed from seleniranium salts, instead cleavage to the alkene (1) and diselenide (13, 15) occurs. The thiirenium salt [Ad C SCH CH SiMe ] Tf N (35) does not yield the thiirene Ad C S (37), the three-membered ring is cleaved, forming the alkyne (3) and disulfide (4). All compounds are characterized by ESI mass spectra, NMR spectra, and by quantum chemical calculations. Crystal structures of the salts 8, 12, 25, 17, 26, 36 and the thiiranes 27, 30 are presented.
Poleschner H, Seppelt K Chemistry. 2020; 27(2):649-659.
PMID: 32737908 PMC: 7821244. DOI: 10.1002/chem.202003461.