✦ LIBER ✦

Present Trends in Polyurethane Chemistry

✍ Scribed by Dr. Helmut Piechota

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 141 KB
Volume: 10
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.197102001

No coin nor oath required. For personal study only.

✦ Synopsis

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 considerably on changing from the solution to the crystalline phase as a reaction system and in one case even changes its direction.

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