New polyfluorinated aromatic and aza-aromatic diselenides, selenyl chlorides, non-symmetric selenides and selenoxides

Zero-, one-, two- and three-dimensional supramolecular architectures sustained by Se…O chalcogen bonding: A crystallographic survey

“…In terms of the oxide donors, two form two Se … O(oxide) contacts and the remaining four oxide-oxygen atoms participate in a single contact, indicating the hexamer is sustained by eight Se … O(oxide) interactions in all. A related situation pertains for the hexamer formed in the crystal of 50 [115] , Fig. 5 k. The core and asymmetry in the hexamer comprising 50 is as descried for 49 .…”

“…The interactions selenium(VI) species form with oxygen reflect more conventional Lewis acid-Lewis base interactions. There are 18 selenium(IV) species, 33 – 50 [100] , [102] , [103] , [104] , [105] , [106] , [107] , [108] , [109] , [110] , [111] , [112] , [113] , [114] , [115] , and five selenium(VI) species, 51 – 55 [116] , [117] , [118] , [119] , forming Se … O contacts leading to zero-dimensional aggregates, with the chemical diagrams for the interacting species in these shown in Fig. 4 .…”

Steric Influence and Intermolecular Interactions of Formamidinate Ligands in Lanthanide (Sm, Yb) Arylchalcogenolate Complexes

“…The advantages of using fluorinated ligands can be accompanied by more complicated synthesis of the desired products: due to high energy of formation of Ln–F bonds the reductive properties of low‐valent Ln complexes may cause breakage of C–F bond with the formation of simpler mono‐ or polynuclear fluorido complexes. [6d], Another possible complication is that perfluorinated aromatic ligands can be prone to nucleophilic substitution . Still, the reactions of 1 with perfluorinated diselenides Ar F 2 Se 2 (Ar F = C 6 F 5 or p ‐C 6 F 4 OMe, Scheme ) proceed very similarly to those with non‐fluorinated analog Ph 2 Se 2 .…”

“…General Remarks: All operations were carried out in evacuated vessels or ampoules, the compounds were handled in an argon glove‐box. The following starting compounds were prepared according to literature methods: [Sm(DippForm) 2 (thf) 2 ] and [Yb(DippForm) 2 (thf) 2 ],[8e] Ar F 2 Se 2 (Ar F = C 6 F 5 , p ‐C 6 F 4 OMe), Ph 2 Te 2 . Ph 2 S 2 and Ph 2 Se 2 were obtained from commercial sources and used as received.…”

7.28 Oxidation of Sulfur, Selenium, and Tellurium

“…295a,326a,328a,334 KMnO 4 in acetic acid oxidizes polyfluorinated diaryl selenides to the corresponding selenoxides in satisfactory yield. 335 Alkyl phenyl selenoxides 88 are obtained in high yield by oxidation of the corresponding selenides 87 with 2-nitrobenzenesulfonyl chloride and potassium superoxide in acetonitrile at À 15 1C (Scheme 45). 336 The active oxidant is suggested to be the in situ formed 2-nitrobenzenesulfonyl peroxy intermediate.…”