Hydrosilylation of various sulfur-containing olefins with (RO)3SiH has been achieved using iridium catalysts [IrX(cod)]2 (X = Cl, SPh). The catalysis is applicable to the chemoselective hydrosilylation of thioacetate, which enables the preparation of an industrially important silane coupling agent.
The Regiochemistry of Cyclization of α-Sulfenyl-, α-Sulfinyl-, and α-Sulfonyl-5-hexenyl Radicals: Procedures Leading to Regioselective Syntheses of Cyclic Sulfones and Sulfoxides
作者:Ernest W. Della、Sean D. Graney
DOI:10.1021/jo0497306
日期:2004.5.1
quantities of 6-endo product, the α-sulfinyl species cyclizes with high selectivity (95.5:4.5) via a 5-exo mode. By contrast, ringclosure of the 5-methyl-5-hexenyl radicals is found to give substantially the 6-endo product in all cases. It is the α-sulfonyl-5-methyl-5-hexenyl radical that now exhibits high regioselectivity (97.5:2.5) for 6-endo closure: an illustration of the synthetic value of this observation
作者:Marie E. Krafft、Carmelinda A. Juliano、Ian L. Scott、Colin Wright、Michael D. McEachin
DOI:10.1021/ja00005a038
日期:1991.2
The regioselectivity of the cobalt-mediated cocyclization of an alkene, an alkyne, and carbon monoxide has been shown to be directed by the use of a soft atom, either sulfur or nitrogen, tethered to the alkene partner by a carbon chain. Direction from the homoallylic position is more efficient thant from the allylic or bishomoallylic position. A rationale is proposed to explain this observation. Studies
Regiocontrol in the intermolecular cobalt-catalyzed olefin-acetylene cycloaddition
作者:Marie E. Krafft
DOI:10.1021/ja00211a048
日期:1988.2.3
Reactions de complexes de Co 2 (CO) 6 a coordinat acetylenique avec des sulfures ou amines homoallyliques: obtention de methylthio-2'- et dimethylamino-2' ethyl-5 cyclopentene-2ones
反应 de Co 2 (CO) 6 a coordinat acetylenique avec dessulfes ou amines homoallyliques: obtention demethylthio-2'- et dimethylamino-2'ethyl-5 cyclopentene-2ones
Ring closure of 2-thia- and 2-sulfonyl-5-hexenyl radicals
作者:Ernest W. Della、Sean D. Graney
DOI:10.1016/s0040-4039(00)01377-0
日期:2000.10
Reductive cyclisation of the 2-sulfonyl-5-hexenyl radical with tributyltin hydride in benzene at 80°C affords a 73:23 mixture of the sulfones derived from 5-exo- and 6-endo- ringclosure with a small quantity (4%) of reduced material; under identical conditions, the 2-thia-5-hexenyl radical gives a 70:13:17 mixture of the corresponding sulfides.