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Mechanism of reactions of unsaturated ethers and thioethers II: Dipole moment and charge shift in acetylenic ethers

โœ Scribed by W. Drenth; G. L. Hekkert; B. G. Zwanenburg


Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
383 KB
Volume
79
Category
Article
ISSN
0165-0513

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๐Ÿ“œ SIMILAR VOLUMES


Mechanism of reactions of unsaturated et
โœ W. Drenth; A. Loewenstein ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 450 KB

## Abstract The position of the acetylenic hydrogen in the n.m.r. spectra of several acetylenic ethers and thioethers was measured in carbon tetrachloride, benzene and dioxan. 1โ€Hexyne and 1,5โ€hexadiyne were taken as reference compounds. The results prove the existence of a large charge shift in ac

Mechanism of reactions of unsaturated et
โœ W. Drenth; H. Hogeveen ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 420 KB

## Abstract The acid catalyzed addition of water to ethylthioethyne has been studied in aqueous solution. The reaction is general acid catalyzed and it is faster in H~2~O than in D~2~O. Substitution of a tertiary butyl group for the ethyl group results in a rate enhancement. The entropies of activa

Mechanism of reactions of unsaturated et
โœ E. J. Stamhuis; W. Drenth ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 504 KB

## Abstract The kinetics of the addition of water to ethynyl ethers in aqueous solution were investigated: equation image The reaction is general acid catalyzed. This indicates, that a proton transfer is the rate determining step of the reaction: equation image

Mechanism of reactions of unsaturated et
โœ E. J. Stamhuis; W. Drenth ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 360 KB

## Abstract Additional evidence for the occurrence of a rate determining proton transfer in the hydration of 1โ€alkynyl ethers is afforded by the value of the solvent deuterium isotope effect, k/k = 1.7. The addition of water to 1โ€ethoxyโ€1โ€propyne was investigated in a series of alcoholโ€water mixtu

Mechanism of reactions of unsaturated et
โœ E. J. Stamhuis; W. Drenth ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 426 KB

## Abstract As in the formation of esters from alkyl ethynyl ethers with primary alkyl groups by addition of water, isopropyl and __tert__.โ€butyl acetate are produced from isopropoxyโ€ and __tert__.โ€butoxyethyne. In addition, the latter ethers show formation of an acidic product and an olefin. A me