𝔖 Bobbio Scriptorium
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SYNTHESES OF CHROMANES AND COUMARANES.

✍ Scribed by Rindfusz, R. E.


Book ID
120441780
Publisher
American Chemical Society
Year
1919
Tongue
English
Weight
521 KB
Volume
41
Category
Article
ISSN
0002-7863

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## Abstract magnified image This review intends to explore synthetic methodologies for the preparation of 2__H‐__chromenes and their analog chromanes through __ortho__‐quinone methide (__o__‐QM) intermediates associated with inter and intramolecular hetero‐Diels‐Alder and electrocyclization reactio

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Monunorillonite clays catalyze the rearrangement of substituted ally1 phenyl ethers to provide onho-ally1 phenols, chromans and coumaran s under mild conditions. The [3,33 sigmatropic shift (Claisen rearrangement) of ally1 aryl ethers provides convenient access to ortho-ally1 phenols, precursors to