Selective photocatalytic transfer-hydrogenation to 1,5-cyclooctadiene with light transition metal modified rhodium colloid catalyst
✍ Scribed by Taka-aki Hanaoka; Takehiko Matsuzaki; Yoshihiro Sugi
- Book ID
- 104424546
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 413 KB
- Volume
- 149
- Category
- Article
- ISSN
- 1381-1169
No coin nor oath required. For personal study only.
✦ Synopsis
Effects of additive were examined for the photocatalytic transfer hydrogenation from 2-propanol to 1,5-cyclooctadiene Ž . Ž . Ž . 1,5-COD with using acetone and Rh CO as a catalyst precursor. Photo-irradiation easily transformed Rh CO to 4 1 2 4 1 2 colloidal dispersion in the presence of acetone. Primary particle size of colloid was ca. 2 nm and it formed secondary Ž . particles through aggregation. With colloidal rhodium catalyst, the selectivity of cyclooctene COE was 86% and the ratio Ž . Ž . of hydrogenation rate R s cyclooctadiene to cyclooctenercyclooctene to cyclooctane was 4.8. Addition of Fe NO P 3 3 9H O enhanced the performance of selective transfer hydrogenation. When Fe salt was used, selectivity reached to 96% and 2 R value decreased to 1.1. The addition of Fe salt did not change primary particle size, but the formation of secondary Ž . Ž . particle was diminished. Other salt of light transition metal, Ni NO P 6H O and Cu NO P 3H O, also changed the rate 3 2 2 3 2 2
of transfer hydrogenation and R value. These changes were attributable to the change of affinity between surface and substrates causing modification with metal cation.