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Regioselectivity in [π2 + π2] photocycloaddition reactions between cyclopent-2-enones and β-oxysubstituted acrylates

✍ Scribed by Martine Van Audenhove; Daniel Termont; Denis De Keukeleire; Maurits Vandewalle; Magda Claeys


Publisher
Elsevier Science
Year
1978
Tongue
French
Weight
218 KB
Volume
19
Category
Article
ISSN
0040-4039

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Azo Bridges from Azines, XXII. [2 + 2] P
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## Abstract The known 1,5‐lacticyclic interaction between parallel CC/ NN bridges in 1 in expressed by a bathochromic shift of the azo n‐π^\*^ transition of +7–10 nm. A CCCN bridge (2, 6) increases the bathochromic shift slightly, whereas a CC–OSiR~3~ bridge (3) cases a hypsochromic shift of −