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The present study reports, bioefficacy evaluation of effective compounds against Meloidogyne incognita and Sclerotium rolfsii in pot cultured tomato. The identified five most effective compounds, i.e. (2 E )-1-(4-Methylphenyl)-3-ferrocenyl-prop-2-en-1-one ( 6g ), (2 E )-1-(4-Methoxyphenyl)-3-ferrocenyl-prop-2-en-1-one ( 6h ), (2 E )-1-(3-Bromophenyl)-3-ferrocenyl-prop-2-en-1-one ( 6j ), (2 E )-1-(2,4-Dichlorophenyl)-3-ferrocenyl-prop-2-en-1-one ( 6k ) and (2 E )-1-(3,5-Dichloro-2-hydroxyphenyl)-3-ferrocenyl-prop-2-en-1-one ( 6p ) along with Carbofuran 3G as positive control were tested at 20, 40 and 80 ppm by soil drenching and root dipping methods. The study revealed that all plant growth parameters were positively influenced by these compounds. The presence of an electron releasing group positively influenced the efficacy, and the activity was highest in compounds 6g and 6h at 80 ppm. Based on in vitro results against S. rolfsii , (2 E )-1-Ferrocenyl-3-(4-bromophenyl)-prop-2-en-1-one ( 3b ), (2 E )-1-Ferrocenyl-3-(2,6-dichlorophenyl)-prop-2-en-1-one ( 3o ) and (2 E )-1-(5-Chloro-2-hydroxyphenyl)-3-ferrocenyl-prop-2-en-1-one ( 6o ) along with Tebuconazole 25.9% EC and Hexaconazole 5% SC as positive control were evaluated. The shoot length was found to be highest (24.50 cm) in plants treated with 3b followed by 3o and 6o at 1000 ppm. The percent disease incidence was significantly decreased as compared to control. The percent disease incidence was found to be minimum in plants treated with 3b at 1000 ppm. However, root dipping was not as effective as soil drenching. Therefore, ferrocenyl chalcone derivatives proved to be of great fungicidal and nematicidal potential opening new opportunities for expanding their effectiveness as new pest control agents.

A series of ferrocenyl chalcones using acetylferrocene, with ferrocenyl group at the keto carbonyl group, and different aldehydes were synthesized and their bioefficacy evaluation was done against Sclerotium rolfsii , Alternaria solani and Meloidogyne incognita. In continuation of our quest for potent crop protection products, in the present study, a series of 18 substituted ferrocenyl chalcones were synthesized in which ferrocenyl group was attached to the aldehyde moiety, using ferrocenecarboxyaldehyde and different acetophenones by microwave method (MM) and conventional method (CM) [ cf : MM 1 to 5 min; CM 12-40 h] and characterized by various techniques viz. IR, LC-HRMS, 1 H-NMR and 13 C-NMR. In vitro fungicidal activity showed that compound, (2 E )-1-(5-Chloro-2-hydroxyphenyl)-3-ferrocenyl-prop-2-en-1-one ( 34) (ED 50 = 21.50 mg L -1 ) was found to be most active against S. rolfsii and compound, (2 E )-1-(4-Bromophenyl)-3-ferrocenyl-prop-2-en-1-one ( 21) (ED 50 = 31.14 mg L -1 ) showed highest activity against A. solani. As regards nematicidal activity, compound (2 E )-1-(3-Bromophenyl)-3-ferrocenyl-prop-2-en-1-one ( 29) was more potent with LC 50 values of 11.95, 8.07 and 4.34 mg L -1 at 24, 48 and 72 h, respectively. QSAR study revealed that MLR for S. rolfsii ( r 2 = 0.9834, q 2 = 0.8975) and A. solani ( r 2 = 0.9807, q 2 = 0.8713) and PLS for M. incognita ( r 2 = 0.9023, q 2 = 0.7818) were the best models.