Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina.
The reaction of catalytic cyclisation of (+)-citronellal has been done using y-alumina and Zn/y-alumina as catalysts. Zn/y-alumina catalyst was prepared by impregnation of ZnBr2 into solid of y-alumina in methanol as a solvent. The calcination process is performed on Muchalal reactor at 400 °C. The...
| Main Author: | |
|---|---|
| Format: | Article |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2004
|
| Subjects: |
| _version_ | 1797017656143904768 |
|---|---|
| author | Perpustakaan UGM, i-lib |
| author_facet | Perpustakaan UGM, i-lib |
| author_sort | Perpustakaan UGM, i-lib |
| collection | UGM |
| description | The reaction of catalytic cyclisation of (+)-citronellal has been done using y-alumina and Zn/y-alumina as catalysts. Zn/y-alumina catalyst was prepared by impregnation of ZnBr2 into solid of y-alumina in methanol as a solvent. The calcination process is performed on Muchalal reactor at 400 °C. The reactions were carried out under nitrogen gas atmosphere by mixing 5 mL sample and 1.0 g catalyst at 90-95 °C for 3 hours. The product of reaction was analyzed using GC, FT-IR and GC-MS. The reaction of cyclization of (+)-citronella) with y-alumina catalyst did not give targeted product as well as reaction with Zn/y-alumina catalyst. Whereas, the reactions with Zn/y-alumina catalyst gave four compounds of isopulegol stereoisomer. Conversion of (-)-Isopulegol, (+)-Neoisopulegol, (+)-lsoisopulegol and (+)-Neoisoisopulegol were 64,29%, 18,80%, 9,20% and 3,32% respectively. For that reason, the transformation of (+)-sitronelal using Zn/yalumina was considered to be the best catalyst. A reaction mechanism is proposed where the (+)-citronellal molecule binds to a catalyst Lewis acid site via the aldehyde oxygen and the Tr-electrons of the double bond. Subsequent protonation of the aldehyde via a neighbouring Bronsted acid site initiates the cyclisation to isopulegol.
Keywords: catalytic cyclisation, impregnation, (+)-isopulegol. |
| first_indexed | 2024-03-05T22:52:33Z |
| format | Article |
| id | oai:generic.eprints.org:17727 |
| institution | Universiti Gadjah Mada |
| last_indexed | 2024-03-13T18:33:46Z |
| publishDate | 2004 |
| publisher | [Yogyakarta] : Universitas Gadjah Mada |
| record_format | dspace |
| spelling | oai:generic.eprints.org:177272014-06-18T00:29:21Z https://repository.ugm.ac.id/17727/ Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. Perpustakaan UGM, i-lib Jurnal i-lib UGM The reaction of catalytic cyclisation of (+)-citronellal has been done using y-alumina and Zn/y-alumina as catalysts. Zn/y-alumina catalyst was prepared by impregnation of ZnBr2 into solid of y-alumina in methanol as a solvent. The calcination process is performed on Muchalal reactor at 400 °C. The reactions were carried out under nitrogen gas atmosphere by mixing 5 mL sample and 1.0 g catalyst at 90-95 °C for 3 hours. The product of reaction was analyzed using GC, FT-IR and GC-MS. The reaction of cyclization of (+)-citronella) with y-alumina catalyst did not give targeted product as well as reaction with Zn/y-alumina catalyst. Whereas, the reactions with Zn/y-alumina catalyst gave four compounds of isopulegol stereoisomer. Conversion of (-)-Isopulegol, (+)-Neoisopulegol, (+)-lsoisopulegol and (+)-Neoisoisopulegol were 64,29%, 18,80%, 9,20% and 3,32% respectively. For that reason, the transformation of (+)-sitronelal using Zn/yalumina was considered to be the best catalyst. A reaction mechanism is proposed where the (+)-citronellal molecule binds to a catalyst Lewis acid site via the aldehyde oxygen and the Tr-electrons of the double bond. Subsequent protonation of the aldehyde via a neighbouring Bronsted acid site initiates the cyclisation to isopulegol. Keywords: catalytic cyclisation, impregnation, (+)-isopulegol. [Yogyakarta] : Universitas Gadjah Mada 2004 Article NonPeerReviewed Perpustakaan UGM, i-lib (2004) Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. Jurnal i-lib UGM. http://i-lib.ugm.ac.id/jurnal/download.php?dataId=490 |
| spellingShingle | Jurnal i-lib UGM Perpustakaan UGM, i-lib Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title | Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title_full | Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title_fullStr | Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title_full_unstemmed | Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title_short | Study of Catalystic Cyclisation of (+)-Citronellal with Zn/y-Alumina as Catalyst = Mempelajari Reaksi Siklisasi Katalistik (+)-Sitronelal dengan Katalis Zn/y-alumina. |
| title_sort | study of catalystic cyclisation of citronellal with zn y alumina as catalyst mempelajari reaksi siklisasi katalistik sitronelal dengan katalis zn y alumina |
| topic | Jurnal i-lib UGM |
| work_keys_str_mv | AT perpustakaanugmilib studyofcatalysticcyclisationofcitronellalwithznyaluminaascatalystmempelajarireaksisiklisasikatalistiksitronelaldengankatalisznyalumina |