Urea-containing polyurethane reaction systems, based on ethylene oxide-capped poly(propy1ene oxide) polyether diol, 1,4-butyldiol, uretonimine liquefied 4,4'-diphenylmethane diisocyanate, and a biurea compound, were used to investigate the effect of urea groups on polyurethane bulk polymerization by
Effect of four neighboring groups in kinetics of polymer reactions
β Scribed by P. Krishnaswami; D. P. Yadav
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- English
- Weight
- 384 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0021-8995
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Directing Effect of a Neighboring Aromatic Group in the Cyclopropanation of Allylic Alcohols. -Various racemic allylic alcohols are stereoselectively transformed to cyclopropanes with I-CH 2 -Cl in the presence of either zinc or samarium reagent. Alcohols bearing an aryl group at the stereocenter a