Darstellung von Bis(1-phenoxy-propen-2-yl)-sulfanen aus Bis(1-chlor-3-phenoxy-prop-2-yl)-sulfanen mit Kalium-tert.-butylat - Zuordnung der E,E-Konfiguration
摘要:
Bis(1-chloro-3-phenoxy-prop-2-yl)-sulfanes (1), anti-MARKOVNIKOV 2:1-adducts of allylphenyl ethers with sulfur dichloride at low temperature are transformed in the presence of potassium-tert.-butoxid by dehydrohalogenation / prototropic rearrangement to phenoxyvinyl sulfanes, the E,E-bis(1-phenoxy-propen-2-yl)sulfanes 3. Sulfanes 3 are of special interest as a model for unsaturated macrocycles B derivated from dithiacrown ethers A. The configuration was assigned using H-1-n.m.r.- and C-13-n.m.r.-spectroscopy. The molecular structure was determinded by X-ray diffraction techniques. Rearrangement of sulfur-substituted allyl ethers 2 to the propenyl isomers 3a proceeds in a stereospecific manner as for common allyl ethers described in the literature.
Darstellung von Bis(1-phenoxy-propen-2-yl)-sulfanen aus Bis(1-chlor-3-phenoxy-prop-2-yl)-sulfanen mit Kalium-tert.-butylat - Zuordnung der E,E-Konfiguration
Bis(1-chloro-3-phenoxy-prop-2-yl)-sulfanes (1), anti-MARKOVNIKOV 2:1-adducts of allylphenyl ethers with sulfur dichloride at low temperature are transformed in the presence of potassium-tert.-butoxid by dehydrohalogenation / prototropic rearrangement to phenoxyvinyl sulfanes, the E,E-bis(1-phenoxy-propen-2-yl)sulfanes 3. Sulfanes 3 are of special interest as a model for unsaturated macrocycles B derivated from dithiacrown ethers A. The configuration was assigned using H-1-n.m.r.- and C-13-n.m.r.-spectroscopy. The molecular structure was determinded by X-ray diffraction techniques. Rearrangement of sulfur-substituted allyl ethers 2 to the propenyl isomers 3a proceeds in a stereospecific manner as for common allyl ethers described in the literature.