## Abstract New 1,1‐disubstituted 2‐vinylcyclopropanes were synthesized by reaction of the corresponding malonyl diesters with __trans__‐1,4‐dibromo‐2‐butene and of sodium hydride. The structure of the 2‐vinylcyclopropanes could be confirmed by elemental analysis, IR, ^1^H NMR and ^13^C NMR spectro
Polymerization of cyclic monomers, 1. Radical polymerization of unsaturated spiro orthocarbonates
✍ Scribed by Norbert Moszner; Frank Zeuner; Volker Rheinberger
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 312 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1022-1336
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
7‐Methyl‐2‐methylene‐ (1) and 7‐methyl‐2,3‐dimethylene‐1,4,6,9‐tetraoxaspiro[4.4]nonane (2) were synthesized and characterized by elemental analysis, IR, ^1^H NMR and ^13^C NMR spectroscopy. Radical polymerization of the spiro orthocarbonates (SOC) 1 and 2 show that they undergo primarily vinyl polymerization with a low degree of ring‐opening reaction. Homopolymerization of 2 at 120°C with di‐tert‐butyl peroxide gives a transparent crosslinked polymer and the polymerization generates a 12,5% shrinkage in volume.
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