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Ketene Acetals. XXXV. Cyclic Ketene Acetals and Orthoesters from 2,2-Dimethoxy-2,3-dihydropyran

✍ Scribed by McElvain, S. M.; McKay, G. Robert


Book ID
120830860
Publisher
American Chemical Society
Year
1955
Tongue
English
Weight
850 KB
Volume
77
Category
Article
ISSN
0002-7863

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πŸ“œ SIMILAR VOLUMES


ZnCl2-catalysed cycloadditions between k
✍ C. G. Bakker; J. W. Scheeren; R. J. F. Nivard πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 665 KB

## Abstract 2,2‐Dialkoxy‐3,4‐dihydropyrans (3) can be obtained under mild conditions and in good yields from ketene acetals (1) and Ξ±,β‐unsaturated carbonyl compounds (**2**) in the presence of ZnCl~2~. At low temperatures (< βˆ’20Β°C) the reaction between **1** and **2** proceeds as a (2 + 2)‐cycload

First [2+2]-cycloaddition of a 3,4-dideh
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The 3-or 4-halopyridines and a ketene dialkyl acetal were shown to permit the synthesis of pyrido[b]cyclobutene derivatives. This finding constitutes the first published report of cycloadditions involving an olefin and a 3,4-pyridyne partner. The reaction is totally regioselective and the structure