In the reaction of 2-ethoxy-1,3-oxathiolane with carbonylcompounds in the presence of ZnCl2 or HgCl2, it has been found that only the breaking of the endocyclic bond (C–O or C–S bond) occurs, while the breaking of the exocyclic C–O bond to give the 1,3-oxathiolan-2-ium ion is unfavorable. This behavior is different from that of 2-ethoxy-1,3-dithiolane, in which the breaking of the endocyclic C–S bond
Photochemically initiated reactions of substituted 1,3-dioxolanes and 1,3-oxathiolanes in CFCl3
作者:J.W. Hartgerink、L.C.J. van Der Laan、J.B.F.N. Engberts、Th.J. de Boer
DOI:10.1016/s0040-4020(01)91643-6
日期:1971.1
from the substrate to give intermediate cyclic (thio)acetal radicals which can be trapped efficiently by 2-nitroso-2-methylpropane in inert solvents. The resulting nitroxides are identified by their ESR hfs-constants. No ring-opened (thio)ester radicals could be trapped. The course of photolysis of optically active 2RS,4R-(−)-2-methyl-4-phenyl-1,3-dioxolane and other (racemic) 2,4-disubstituted-1,3-dioxolanes
Facile protection of carbonyl compounds as oxathiolanes and thioacetals promoted by PEG1000-based dicationic acidic ionic liquid as chemoselective and recyclable catalyst
作者:Yi-Ming Ren、Juan-Juan Shao、Zhi-Chuan Wu、Shuai Zhang、Ting-Xian Tao
DOI:10.1016/j.molliq.2014.04.020
日期:2014.8
and thioacetalization of carbonylcompounds have been achieved in high yields employing PEG1000-based dicationic acidic ionic liquid as a catalyst. The PEG ionic liquid and toluene have the advantages of both homogeneous and heterogeneous phases at different temperatures (biphasic conditions at lower temperatures and monophasic at higher temperatures) with the ease of product as well as catalyst separation
Scandium(III) Triflate as an Efficient and Recyclable Catalyst for Chemoselective Conversion of Carbonyl Compounds to 1,3-Oxathiolanes
作者:Babak Karimi、Leila Ma’mani
DOI:10.1055/s-2003-42436
日期:——
A variety of carbonyl compounds can be easily and rapidly converted to the corresponding 1,3-oxathiolanes in the presence of a catalytic amount of scandium(III) triflate [Sc(OTf)3] in CH2Cl2. After completion of the reaction, the catalyst can straightforwardly be recovered using standard methods. Moreover, by employing this protocol, chemoselective oxathioacetalization of aldehydes in the presence of ketones can be achieved.
Nickel(II) chloride hexahydrate catalyzed reaction of aromatic aldehydes with 2-mercaptoethanol: formation of supramolecular helical assemblage of the product
作者:Rajibul A. Laskar、Naznin A. Begum、Mohammad Hedayetullah Mir、Md. Rumum Rohman、Abu T. Khan
DOI:10.1016/j.tetlet.2013.08.070
日期:2013.10
Various aromatic aldehydes on reaction with 2-mercaptoethanol provided an unanticipated product, bis(2-hydroxyethyl)dithioacetals (3) as the major product along with the expected product 1,3-oxathiolanes (4) in the presence of 0.05 equiv amount of nickel(II) chloride hexahydrate (NiCl2·6H2O) under solvent-free conditions. Products 3c and 3e exhibit an interesting hydrogen-bonded infinite supra-molecular