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Solid-State Photocyclodimerization of 1-Thiocoumarin (= 2H-1-Benzothiopyran-2-one)

✍ Scribed by Christian P. Klaus; Carolin Thiemann; Jürgen Kopf; Paul Margaretha


Publisher
John Wiley and Sons
Year
1995
Tongue
German
Weight
189 KB
Volume
78
Category
Article
ISSN
0018-019X

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📜 SIMILAR VOLUMES


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## Abstract Irradiation (λ = 350 nm) of 1__H__‐[2]benzothiopyran‐1‐one (2) in the solid state affords selectively and in good yield 6aα, 6bα, 12bα, 12cα ‐tetrahydrocyclobuta[1, 2‐__c__:4, 3‐__c__′]bis([2]benzothiopyran)‐5, 8‐dione (3), the head‐to‐head (HH) __cis__‐__cisoid__‐__cis__‐cyclodimer of

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## Abstract **Summary:** Advanced ^1^H solid‐state NMR methods are applied for studying the hydrogen bond formation occurring in polymer hydrogels based on __N__‐isopropylacrylamide (NIPAAm) and methacrylic acid (MAA). For P(NIPAAm‐__co__‐MAA) copolymers collapsed at low pH, two populations of wate