Benzoylgermanium Derivatives as Novel Visible-Light Photoinitiators for Dental Composites
✍ Scribed by Norbert Moszner; Frank Zeuner; Iris Lamparth; Urs Karl Fischer
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 366 KB
- Volume
- 294
- Category
- Article
- ISSN
- 1438-7492
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
New dibenzoylgermanium derivatives are synthesized starting from various dithioacetal protected benzaldehydes by a coupling reaction with different dialkyldichlorogermanes and subsequent oxidative cleavage of the protecting group. The synthesized germanium compounds show a significantly stronger blue light absorption than camphorquinone. During irradiation, the dibenzoylgermanium derivatives undergo photodecomposition under formation of radicals. Therefore, the different dibenzoylgermanium derivatives are used as amine‐free visible‐light photoinitiators for dental cements and composites. Composites based on the different dibenzoylgermanes are storage‐stable and show a significantly improved bleaching behavior over composites with CQ/amine photoinitiators.
magnified image