Diethyl diglycollate condenses with furan -2-aldehyde and thiophene-2- aldehyde in pre¬sence of sodium hydride to give predominantly the (Z)-half ester (la, b) together with small amo- unts of the (E)-half ester (2a, b). The structure of the (E)-half esters was based on their cycliza- tion to cyclopenteno-furan and cyclopentenothiophene derivatives (5a, b) respectively, as well as on spectroscopic evidence.
The ratio of isomers has been interpreted in terms of the relative ease of formaticn of the S-lactone intermediates.
Diethyl diglycollate condenses with furan-2-aldehyde and thiophene -2-aldehyde in presence of sodium hydride to give predominantly the (Z) half ester (la, b) together with small amounts of the (E)-half ester (2a, b). The structure of the (E)-half esters was based on their cycliza- tion to cyclopenteno-furan and cyclopentenothiophene derivatives (5a, b) respectively, as well as on spectroscopic evidence.
Primary Language | English |
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Subjects | Chemical Engineering |
Journal Section | Research Article |
Authors | |
Publication Date | January 1, 1985 |
Published in Issue | Year 1985 Volume: 31 |
Communications Faculty of Sciences University of Ankara Series B Chemistry and Chemical Engineering
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