1073-91-2Relevant articles and documents
The Ozonolysis of Tetramethylethylene. Concentration and Temperature Effects
Murray, Robert W.,Kong, Wei,Rajadhyaksha, Shirish N.
, p. 315 - 321 (2007/10/02)
The products of the ozonolysis of tetramethylethylene in hexane or methylene chloride are remarkably dependent on the concentration of tetramethylethylene.Ozonolysis in neat tetramethylethylene gives mostly tetramethylene epoxide as product.As the concentration of tetramethylethylene is reduced, more acetone diperoxide is formed until it becomes the major product.The reaction also produces 3-hydroperoxy-2,3-dimethyl-1-butene.The product distribution is also quite dependent on reaction temperature.At a given concentration of the alkene the epoxide yield decreases as the temperature is lowered.Simultaneously the acetone diperoxide yield increases with lower temperature.The results are explained by postulating that energy-rich acetone oxide can be partially converted to dimethyldioxirane which is primarily responsible for the epoxidation.The proposed reaction scheme also has acetone oxide dimerize in a stepwise manner to give an intermediate which can either close to give diperoxide or lose singlet oxygen.The singlet oxygen would then react with tetramethylethylene to give the hydroperoxide.
Thromboxane A2 Analogues from 8-Oxabicyclooct-6-en-3-ones
Bowers, Kevin G.,Mann, John,Walsh, E. Brian,Howarth, Oliver W.
, p. 1657 - 1666 (2007/10/02)
We describe approaches to thromboxane A2 analogues (3), (4), and (32) which contain 2,6-dioxabicyclooctane and 2,6-dioxatricyclo3,7>nonane ring system.Both were derived from 2-substituted 8-oxabicyclooct-6-en-3-
Synthesis and X-Ray Analysis of 2,3,5,6,11-Pentaoxabicycloundecanes
Miura, Masahiro,Ikegami, Akio,Nojima, Masatomo,Kusabayashi, Shigekazu,McCullough, Kevin J.,Walkinshaw, Malcolm D.
, p. 1657 - 1664 (2007/10/02)
The reactions of bicyclic ozonides and aldehyde- or ketone-derived peroxides, performed or generated in situ, in the presence of chlorosulphonic acid afford the corresponding 2,3,5,6,11-pentaoxabicycloundecanes.In addition, 1,2,4,5-tetraoxans are often isolated from the product mixture.Mechanisms are proposed to account for the observed peroxidic products.An X-ray analysis of the crystalline product (4b) confirms the general structure and reveals that it is solely the exo-isomer.