On treatment with tellurium tetrachloride in dichloromethane at room temperature, 1,3-dithiolanes and 1,3-oxathiolanes undergo smooth ring expansion to give dihydro-1,4-dithiin and dihydro-1,4-oxathiin derivatives respectively in good to moderate yields.
A one-pot synthesis of 1,4-dithiins and 1,4-benzodithiins from ketones using the recyclable reagent 1,1′-(ethane-1,2-diyl)dipyridinium bistribromide (EDPBT)
作者:Siva Murru、Veerababurao Kavala、C.B. Singh、Bhisma K. Patel
DOI:10.1016/j.tetlet.2006.12.003
日期:2007.2
the corresponding ketones in one-pot using the recyclable reagent, 1,1′-(ethane-1,2-diyl)dipyridinium bistribromide (EDPBT) is described. This method is mild, simple, environmentally benign and is applied successfully for the ringexpansion of 1,3-dithiolane to 1,4-dithiins and the ringexpansion associated with aromatisation of cyclicketones with or without double bonds in the ring. The main feature
Chemistry of ethanediyl S,S-acetals 6- An example of vicarious nucleophilic substitution of hydrogen in 1,4-benzodithians
作者:Romualdo Caputo、Mauro De Nisco、Giovanni Palumbo、Carlo Adamo、Vincenzo Barone
DOI:10.1016/s0040-4020(01)81819-6
日期:1993.1
1,4-Benzodithians, when treated with bromine in anhydrous chloroform, undergo very fast monobromination at the aromatic ring. By the use of quantum mechanical semiempirical calculations, the reaction is shown to proceed most likely via a vicarious nucleophilic substitution of hydrogen.
TANI, HIROYUKI;INAMASU, TOKUO;TAMURA, RUI;SUZUKI, HITOMI, CHEM. LETT.,(1990) N, C. 1323-1326
The crystal and molecular structure of the title compound, C12H10O2S2, has been determined, The most relevant features are the tuans disposition of the sulfinyl groups and the distorted 1,3-diplanar form of the 1,4-dithiane 1,4-dioxide ring.