Present Trends in Polyurethane Chemistry
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Dr. Helmut Piechota
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Article
📅
1971
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John Wiley and Sons
🌐
English
⚖ 141 KB
As a result of the restricted internal mobility of the intermediate species formed from the confi urationally isomeric ketone pairs (la)l(Za) and ( 1b)i(2b)1'zf on UV irradiation, the configurational selectivity of the subsequently isolated benzocyclobutene derivatives (3) and (4) increases consider