76390-48-2Relevant articles and documents
Le (chlorodiisopropyl)silyl fluorenyllithium: un equivalent synthetique du diisopropyl(fluorenylidene)silene
Couret, C.,Escudie, J.,Delpon-Lacaze, G.,Satge, J.
, p. 233 - 242 (1992)
The metalation of chlorodiisopropylfluorenylsilane 1 with n-butyllithium leads to the α-silylthio compound 3.Compound 3 has a surprising stability and does not afford the diisopropyl(fluorenylidene)silene but behaves as its synthetic equivalent; i.e. it is a useful reagent for "Wittig-Peterson" reactions with various carbonyl compounds leading readily to diisopropylsilanone and fluorenylidene derivatives.
Organosulfur Compounds, L. - 2H-Thiopyrans and Dihydro-2H-thiopyrans, Synthons for Thiophenes
Praefcke, Klaus,Weichsel, Christian
, p. 1604 - 1619 (2007/10/02)
2H-Thiopyran derivatives yield thiophenes on pyrolysis at 240-260 deg C.The influence of substitution in positions 3 to 6 of the 2H-thiopyrans on these new thermal rearrangement and fragmentation reactions is dealt with, and some proposed mechanisms are discussed in detail.A novel three-step synthesis of thiophenes from carbonyl compounds via the corresponding thiones, their -cycloaddition with 1,3-dienes with formation of dihydro-2H-thiopyrans and subsequent thermal conversion is described.In this reaction sequence, whose scope and limitations are outlined, t he thiocarbonyl compound contributes the sulfur and the 1,3-diene the carbon skeleton of the desired thiophenes.
