NMR study of the spatial structure of synthetic pyrethroids

Nonvolatile insect repelling agent prepared by grafting of permethrin on polybutadiene

“…However, it can be recognized that permethrin is not bonded by CH=CCl 2 moiety because the CH=CCl 2 peak at 6.4 ppm is still alive for Permethrin@PB. 15 FTIR peak assignment of permethrin was already reported by Li et al 17 They reported that in-plane and out-of plane deformations vibration of phenyl ring were shown at 816 and 691 cm -1 , respectively. Peaks at 1727 and 1260 cm -1 were assigned to C=O stretching vibration of carbonyl and the asymmetric stretching vibration of C-O-C, respectively.…”

“…1 H NMR peak assignment of permethrin was well established by various researchers. [13][14][15] Solid state 1 H NMR spectra of PB and Permethrin@PB of this study are shown in Figure 2. For Permethrin@PB, in contrast with PB, there are characteristic peaks at 1.2-1.3, 6.4, and 7-7.6 ppm, which are assigned for cyclopropane ring, CH=CCl 2 , and phenyl ring of permethrin, respectively.…”

“…For Permethrin@PB, in contrast with PB, there are characteristic peaks at 1.2-1.3, 6.4, and 7-7.6 ppm, which are assigned for cyclopropane ring, CH=CCl 2 , and phenyl ring of permethrin, respectively. [12][13][14][15][16] Unfortunately, it is premature to declare the reaction mechanism between permethrin and PB because independent specific bonding peaks related with graft reaction were not found. However, it can be recognized that permethrin is not bonded by CH=CCl 2 moiety because the CH=CCl 2 peak at 6.4 ppm is still alive for Permethrin@PB.…”

Crystal structure and features of 3′,8-dibenzylidene-4a,5,6,7,8,8a-hexahydro-2′H-spiro[chromene-2,1′-cyclohexan]-2′-one

“…Spiro heterocycles are of great interest for the creation of new promising biologically active compounds. The spiro center causes a rigid, spatially oriented configuration, which makes the compounds containing them potentially more complementary to binding sites for biological targets (Mirzabekova et al, 2008;Abou-Elmagd & Hashem, 2016;Saraswat et al, 2016). A convenient way obtain heterocyclic compounds, including those with the spiro chromane moiety, is dimerization of Mannich ketones (Shchekina et al, 2017).…”