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[2 + 2] Cycloaddition of ethyl propiolate and silyl enol ethers

✍ Scribed by Clark, Robin D.; Untch, Karl G.


Book ID
121334449
Publisher
American Chemical Society
Year
1979
Tongue
English
Weight
824 KB
Volume
44
Category
Article
ISSN
0022-3263

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## Abstract Methylation of ethyl 2, 4‐dioxopentanoate with diazomethane gives a mixture of two enol ethers, the 2‐methoxy and the 4‐methoxy isomer, with a product ratio which depends upon reaction temperature. Both enol ethers, initially (__Z__)‐configurated, isomerize to the corresponding (__E__)‐