Crystal structure and Hirshfeld surface analysis of N-{[5-(4-methylphenyl)-1,2-oxazol-3-yl]methyl}-1-phenyl-N-(prop-2-en-1-yl)methanesulfonamide

In the title compound, C21H22N2O3S, the 1,2-oxazole ring makes the dihedral angles of 9.16 (16) and 87.91 (17)degrees, respectively, with the toluene and phenyl rings, while they form a dihedral angle of 84.42 (15)degrees with each other. The C-S-N-C-pr and C-S-N-C-me (pr = propene, me = 3-methyl-1,2-oxazole) torsion angles are 86.8 (2) and -100.6 (3)degrees, respectively. In the crystal, molecules are linked by C-H center dot center dot center dot O hydrogen bonds, generating a threedimensional network. A Hirshfeld surface analysis was performed to investigate the contributions of the different intermolecular contacts within the supramolecular structure. The major interactions are H center dot center dot center dot H (53.6%), C center dot center dot center dot H/H center dot center dot center dot C (20.8%) and O center dot center dot center dot H/H center dot center dot center dot O (17.7%)

Comparison of biological methods to control Aphis fabae Scopoli (Hemiptera: Aphididae) on kalanchoe crops in East Africa

Published online: 21 Dec 2020Aphids cause considerable damage to numerous crops all over the world and insecticides are the main means of controlling them, despite their detrimental impacts on human and environmental health. This study assessed the effectiveness of the parasitoid Aphidius colemani Viereck (Hymenoptera: Braconidae), a mixture of predatory ladybird beetles, Hippodamia variegata Goeze, Chilocorus calvus Chiccl, and Cheilomenes propinqua Mulsant (Coleoptera: Coccinellidae), and an entomopathogenic strain of Aspergillus flavus Link (Eurotiales: Trichocomaceae), collected locally in Tanzania, to control Aphis fabae Scopoli (Hemiptera: Aphididae). After assessing the predation and parasitism rates of these natural enemies at different aphid densities in laboratory experiments, their ability to control aphids on kalanchoe was assessed in a greenhouse experiment over two seasons. The largest number of A. fabae parasitized or consumed in the laboratory was found at a density of 160 aphids per predator, or parasitoid. At that density, an adult female of A. colemani parasitized 114 A. fabae per day, on average, and adults of C. calvus, H. variegata, and C. propinqua consumed 75, 72, and 85 aphids per day, respectively. A. flavus spores applied at 1 × 107 spores ml−1 reduced the aphid population by 7.9 and 12.6 times within 10 days in the first and second seasons of the greenhouse experiments, respectively, as opposed to 2.8 and 2.5 times by releasing a mixture of the ladybirds at a rate of 5 adults/m2, and by 3.3 and 9.5 times by releasing A. colemani at a rate of 2 adults/m2. This study confirmed the potential of these locally collected bio-control agents for controlling A. fabae. However, use of the isolated A. flavus strain was undermined by its production of aflatoxin. Further research is therefore required to tap into the potential of a non-toxic strain of A. flavus and/or other entomopathogenic fungi

CCDC 1425649: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures

Crystal structure and Hirshfeld surface analysis of (E)-1-[2,2-dichloro-1-(4-fluorophenyl)ethenyl]-2-(2,4-dichlorophenyl)diazene

In the title compound, C14H7Cl4FN2, the dihedral angle between the 4-fluorophenyl ring and the 2,4-dichlorophenyl ring is 46.03 (19)degrees. In the crystal, the molecules are linked by C-H center dot center dot center dot N interactions along the a-axis direction, forming a C(6) chain. The molecules are further connected by C-Cl center dot center dot center dot pi interactions and face-to-face pi-pi stacking interactions, forming ribbons along the a-axis direction. Hirshfeld surface analysis indicates that the greatest contributions to the crystal packing are from Cl center dot center dot center dot H/H center dot center dot center dot Cl (35.1%), H center dot center dot center dot H (10.6%), C center dot center dot center dot C (9.7%), Cl center dot center dot center dot Cl (9.4%) and C center dot center dot center dot H/H center dot center dot center dot C (9.2%) interactions

Crystal structure and Hirshfeld surface analysis of 5-(5-phenyl-1,2-oxazol-3-yl)-1,3,4-thiadiazol-2-amine

The title compound, C11H8N4OS, crystallizes with two independent molecules in the asymmetric unit. In the crystal, the N-H center dot center dot center dot N and C-H center dot center dot center dot N hydrogen bonds connect the molecules, generating double layers parallel to the (001) plane. The layers are joined by C-H center dot center dot center dot pi interactions to form a three-dimensional supramolecular structure

CCDC 1405782: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures