Blue LED-Promoted Oxathiacetalization of Aldehydes and Ketones
作者:You-Chen Liu、Daggula Mallikarjuna Reddy、Xin-An Chen、Yi-Chen Shieh、Chin-Fa Lee
DOI:10.1002/ejoc.202000218
日期:2020.5.10
A visible‐light‐promoted oxathiacetalization of aldehydes and ketones with 2‐mercaptoethanol and 3‐mercaptopropan‐1‐ol in the presence of eosin Y as catalyst is described leading to the formation of 1,3‐oxathiolanes and 1,3‐oxathianes at ambient temperature and under metal‐free conditions. The solvent is playing vital role in the protection of carbonyl compounds with mercaptoalcohol.
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
Studies in Organic Sulfur Compounds. VI.<sup>1</sup> Cyclic Ethylene and Trimethylene Hemithioketals
作者:Carl Djerassi、Marvin Gorman
DOI:10.1021/ja01111a029
日期:1953.8
Facile protection of carbonyl compounds as oxathiolanes and transoxathioacetalization of oxyacetals promoted by iron(III) trifluoroacetate or trifluoromethanesulfonate as chemoselective and recyclable catalysts
作者:Hadi Adibi、Hadi Jafari
DOI:10.1016/j.jfluchem.2007.04.002
日期:2007.6
Oxathioacetalization of carbonyl compounds and transoxathioacetalization of O,O-acetals/ketals are reported under nearly neutral conditions promoted by iron(III) trifluoroacetate [Fe(CF3CO2)(3)] or trifluoromethanesulfonate [Fe(CF3SO3)(3)] as recyclable and highly efficient Lewis acid catalysts. (c) 2007 Elsevier B.V. All rights reserved.
Electron impact induced fragmentations of some 2,2-disubstituted 1,3-oxathiolanes
作者:Pirjo Vainiotalo、Vesa Nevalainen
DOI:10.1002/oms.1210210804
日期:1986.8
AbstractThe electron impact induced fragmentations of nine 2,2‐disubstituted 1,3‐oxathiolanes have been studied by means of exact mass measurement and metastable ion analysis. The ring cleavage almost always takes place so that the C(2)S and C(5)O bonds are broken, leading to the most stable products. The nature of the substituents determines the primary fragmentations of molecular ions. Ring cleavage is important only if both substituents are alkyl groups or if the carbon attaching to the ring has an alkyl character. The loss of the substituent becomes the most favourable process if it is attached to the ring through the electron‐deficient carbon atom.