@article{hbkup:/content/journals/10.5339/connect.2013.6, author = "Thirunarayanan, G.", title = "Insect antifeedant potent 9H-fluorenacylbromides", journal= "QScience Connect", year = "2013", volume = "2013", number = "1", pages = "", doi = "https://doi.org/10.5339/connect.2013.6", url = "https://www.qscience.com/content/journals/10.5339/connect.2013.6", publisher = "Hamad bin Khalifa University Press (HBKU Press)", issn = "2223-506X", type = "Journal Article", keywords = "Insect antifeedant activity", keywords = "NMR spectra", keywords = "9H-fluorenacyl bromides", keywords = "fly-ash:H2O", keywords = "Infrared spectra", eid = "6", abstract = "Background: Attempts to produce greener bromination of 2-acetyl 9H-fluorene with KBr+KBrO3 reagent using fly-ash:H2O catalyst in aqueous media gave 9H-fluorenacylbromides. Generally, the halo-keto compounds possess insect antifeedant activities. Therefore, the insect antifeedant activities of these acyl bromides have been studied using 4th instar larvae Achoea janataL against castor semilooper. Methods: Solvent free bromination method was used for synthesizing some 9H-fluorenacylbromides. They were characterized by UV, IR, NMR and mass spectroscopic data. Castor-leaf discs were used for evaluation of insect antifeedant activities of the synthesized acyl bromides. Results: The yields of synthesized acyl bromides were over 60%. The physical constants, analytical and spectral data of these ketones has been determined. Halo substituted acyl bromides gave good insect antifeedant activities. Conclusion: Easy handling, non-hazardous and environmentally benign bromination methods have been adopted for synthesizing acyl bromides with good yields. Bromo substituted acyl bromides show better insect antifeedant activity.", }