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Microwave and NMR studies of the structure and the conformational isomerization of 3,6-dihydro-1,2-dioxin

✍ Scribed by Toshihiko Kondo; Masakatsu Matsumoto; Mitsutoshi Tanimoto

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

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✦ Synopsis

Structures of fundamental organic peroxides such as 1,2,4-trioxolanes , peracetic acid2, and dioxirane3 have been well established by microwave spectroscopy. 3,6-Dihydro-1,2-dioxins (1,4-endoperoxides) are also fascinating peroxides which are easily obtained by the reaction of 1,3-dienes with singlet oxygen' and are utilized as versatile intermediates in organic syntheses.

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## Abstract A variable‐temperature ^1^H‐NMR study and X‐ray structural analysis show that the most stable conformational isomer of [3.3](2,6)pyridinophane 2 is the __syn__(boat‐boat) conformer, and the relative stability order of the three stable conformers is __syn__(boat‐boat) > __syn__(chair‐boa