Formation of bifluorenylidene from 9-mercaptofluorene via a sulfide autoxidation-anionic autoxidation-elimination sequence
摘要:
Bifluorenylidene 1 was formed quantitatively when 9-mercaptofluorene 3 was treated with base and exposed to air. The initial step was established to be an intermolecular autoxidation of sulphide ion to form the disulphide 6. An intramolecular autoxidation of the dianion 8 derived from 6 was expected to afford a 1,2-dithietane derivative 9 which eliminated sulphur to give bifluorenylidene 1.
A very simple method for the preparation of symmetrical disulfides
作者:Reko Leino、Jan-Erik Lönnqvist
DOI:10.1016/j.tetlet.2004.09.100
日期:2004.11
of symmetrical aliphatic, aromatic and heteroaromatic disulfides is reported. Addition of sulfurylchloride to an alkyl- or arylthiol in a 1:2 ratio under solventfree conditions or in dichloromethane solution produces the corresponding disulfides in nearly quantitative yields with the concomitant elimination of gaseous SO2 and 2 equiv of HCl. Thus, optimally the reaction needs no work-up at all leaving