合成这些 de dioxolannes-1,2 par 反应 de trioxolannes-1,2,4 avec des alcenes-1 在 de BF 3 -Et 2 O 的存在下;分解 en alcanones、alcanophenones、cetols 等。par 热解,par LiAlH 4 ou en 存在 de TiCl 4 ou FeSO 4
Electronic effects in the reaction of carbonyl oxides with aldehydes
摘要:
Electronic effects in the third step of the Criegee mechanism of ozonolysis, i.e., the reaction of a carbonyl oxide with a carbonyl compound, were studied by using a non-ozone source of carbonyl oxides as well as by an ozonolysis method. Benzophenone oxide, produced by photosensitized oxidation of diphenyldiazomethane or ozonolysis of tetraphenylethylene, was reacted with a series of para-substituted benzaldehydes. The relative rates of triaryl ozonide formation were treated with the Hammett relationship to give rho = 0.48 or 0.76, respectively, for the photooxidation and ozonolysis reactions. These results indicate that electron-withdrawing substituents in the aldehyde increase the rate of ozonide formation and are consistent with those reported earlier by Kuczkowski and co-workers for stilbene ozonide and with the long held view that ozonide formation involves reaction of a dipolar carbonyl oxide with the carbonyl partner.
Highly efficient biphasic ozonolysis of alkenes using a high-throughput film-shear flow reactor
作者:Alexander J. Kendall、Justin T. Barry、Daniel T. Seidenkranz、Ajay Ryerson、Colin Hiatt、Chase A. Salazar、Dillon J. Bryant、David R. Tyler
DOI:10.1016/j.tetlet.2016.02.042
日期:2016.3
A new method for ozonolysis of alkenes using a continuous flow film-shear reactor was developed. The reactor uses a shearing microfluidic mixing chamber to provide biphasic mixing of an organic phase and aqueous phase with ozone gas. The H2O acts as an in situ reducing agent for the carbonyl oxide intermediate, providing ketones and aldehydes directly from the reaction mixture. Flow rates of up to
The reactions of a number of ozonides and olefins in the presence of boron trifluoride–diethyl ether gave the corresponding 1,2-dioxacyclopentanes in 21–77% yield.
The photochemical preparation of ozonides by electron-transfer photo-oxygenation of epoxides
作者:A. Paul Schaap、Shahabuddin Siddiqui、Girija Prasad、Eduardo Palomino、Mark Sandison
DOI:10.1016/s0040-4020(01)96597-4
日期:1985.1
electron-transfer photo-oxygenation of epoxides in oxygen-saturated acetonitrile to form ozonides. Epoxides with oxidation potentials lower than 2 V vs SCE quench the fluorescence of DCA and are converted to the ozonides with DCA alone. Epoxides which do not quench the singlet excited state of DCA are unreactive under these conditions. However, the photo-oxygenation of these epoxides can be effected by addition
Reactivity of aromatic compounds toward diphenylcarbonyl oxide
作者:A. M. Nazarov、G. A. Yamilova、S. L. Khursan、V. D. Komissarov
DOI:10.1007/bf02494266
日期:1998.11
The reactivity of organic compounds (PhH, PhMe, PhF, PhCl, PhOH, PhOEt, PhCHO, Ph2CO, PhCN, Ph2S, Ph2SO, Ph2SO2, andp-Me2C6H4) toward diphenylcarbonyl oxide Ph2COO was characterized by thek33/k31 ratio, wherek33 andk31 are the rate constants for the reactions of Ph2COO with the arene and diphenyldiazomethane Ph2CN2, respectively. The values ofk33/k31 vary from 2.6·10−3 (PhCN) to 0.65 (Ph2S) (70°C,