Transdithioacetalization of acetals, ketals, oximes, enamines and tosylhydrazones catalysed by natural kaolinitic clay
作者:G. K. Jnaneshwara、N. B. Barhate、A. Sudalai、V. H. Deshpande、R. D. Wakharkar、A. S. Gajare、M. S. Shingare、R. Sukumar
DOI:10.1039/a706475f
日期:——
Natural kaolinitic clay efficiently catalyses the transdithioacetalization of acetals, ketals, oximes, enamines and tosylhydrazones with ethane-1,2-dithiol and propane-1,3-dithiol to produce the corresponding dithiolanes in high yields.
I<sub>2</sub>-Mediated Photochemical Preparation of 2-Substituted 1,3-Dioxolanes and Tetrahydrofurans from Alcohols with Polymer-Supported Hypervalent Iodine Reagent, PSDIB
作者:Hideo Togo、Tomomasa Teduka
DOI:10.1055/s-2005-864802
日期:——
Various 2-substituted 1,3-dioxolanes, 1,3-dioxanes, and tetrahydrofurans were obtained selectively in good to moderate yields from the corresponding alcohols with PSDIB in the presence of iodine under irradiation conditions. Moreover, PSDIB was repeatedly used for the same reactions keeping good yield of the cyclic product.
Salmi, Chemische Berichte, 1938, vol. 71, p. 1803,1807
作者:Salmi
DOI:——
日期:——
Photochemical reaction of benzene-1,2,4,5-tetracarbonitrile with the ketals of cyclic and bicyclic ketones
作者:Mariella Mella、Mauro Freccero、Angelo Albini
DOI:10.1021/jo00084a021
日期:1994.3
The radical cations of the ethylene ketals of some cyclic and bicyclic ketones are generated by single electron transfer to excited benzene-1,2,4,5-tetracarbonitrile (TCB). Their fragmentation yields 1,5- and 1,6-distonic radical cations, which add to TCB-. to give [omega-[(2-hydroxyethoxy)carbonyl] alkyl]benzenetricarbonitriles. The reduction of the radical center occurs only to a small extent, and is enhanced in the presence of dodecylmercaptan, in the case of hindered radicals. The reaction of the camphor ethylene ketal (both alkylation of TCB and reduction) occurs with total diastereoselectivity at the reacting radical center.