Selones—

W-1,3,4-Selenadiazoline-2-selone, 5-methylamino- C NMR, 6. 356 <77JOC3725> 3W-l,3,4-Selenadiazoline-2-selone, 5-p-tolylamino- C NMR, 6, 356 <77JOC3725) 3W-l,3,4-Selenadiazoline-2-thione, 5-p-tolylamino- C NMR, 6, 356 <77JOC3725>... 

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Dans les cas d exposition de breve a moyenne duree, on a constate que les points d aboutissement importants de I action toxique etaient le systeme nerveux, le developpement, le systeme immunitaire et le systeme endocrinien, mais cette action se manifeste a des degres variables selon les differents composes. 

REBNER Bis(N,N -dimethylimidazolidin-2-yl)-di-selenone bis(triiodide) N,N-dimethylimidazolidine-2-selone iodine 2.683 3.025 175.52 A... 

The interaction of dihalogens, particularly diiodine, with sulfur and selenium electron donors has been an area of increasing interest over the past decade because of potential biological, pharmaceutical, and electronic materials applications [35,179]. Devillanova and coworkers have recently reviewed the solution behavior of a large number of chalcogenides and I2, particularly thiones, selones, sulfides, and selenides [180]. Correlations between computational methods, thermodynamic parameters, and spectroscopic data (UV/Vis, 13C NMR, Raman, UPS) were discussed. 

Devillanova and coworkers have also addressed this issue with some simple thiones and selones. Using spectroscopic analysis and quantum mechanical calculations, they examined the various possible reaction pathways shown in Fig. 5 [72,183]. The geometries and relative stabilities of the charge-transfer and T-shaped hypervalent adducts were compared using DFT cal-... 

Fig. 5 Pathways for the reaction of thiones and selones with dihalogens...

Many selenoketones18 20 and telluroketones21 23 can be obtained in the solid state as stable 1,3-diselenetanes and 1,3-ditelluretanes and their formation can be assumed as proof of the existence of unstable selenoketone and telluroke-tone. In solution dimers of aromatic selones equilibrate with monomeric species, according to Scheme 5, where equilibrium is shifted by dilution towards the monomer.18,24... 

Sterically congested alkanes containing two =N-NFI2 groups at 1,6218 and two =N2-NF12 groups at 1,7,219 react with Se2Cl2 to form mono- and di-selones. 

By heating alkynyl propargyl selenides give 2-methylene-3-cyclobutene-l-selones, Scheme 29, which dimerize giving a mixture of the corresponding 1,3-diselenetanes232... 

The chemical behaviour of selenoketones is determined by the weakness and polarity of the CSe bond. Some selones eliminate selenium, and the corresponding olefins are isolated. 

Sterically crowded selones and 4 -methoxyselenopivalophenone cyclize with propiolic acid to yield 2H,6H-l,3-oxaselenin-6-one derivatives115 (Scheme 33). 

Treatment of sterically-crowded selones possessing substituted bornane skeletons with chloramine-T afford several products derived from intermediary selone Se-imides (Scheme 37). Direct observation of the intermediates was done by NMR monitoring at low temperature.240... 

Diferrocenyl selone reacts with W(CO)5 THF yielding the selone pentacar-... 

A very illustrative example of this is represented by the 1 2 adduct between Y-methylbenzothiazole-2(3//)-selone (btseMe) with IBr (Figure 5).26... 

The structure of 11 2IBr is (TBP, TBP), which represents the first example of a T-shaped adduct of a selenium compound with IBr.39a The anomalous bond distances in ll-2IBr (Se-Br (A)/Se-I (A) 2.897(2)/2.606(2) and 2.766(2)/ 2.629(2) for the two Br-Se-I units, respectively) have been explained on the basis of different polarities of the two bonds and on the basis of the involvement of Br in intramolecular hydrogen bondings. Reactions and/or structures are similarly investigated for A-methylthiazolidine-2(3H)-selone (12), N-methylbenzothiazole-2(3H)-selone (13), tV,7V -dimethylbenzoimidazole-2(3H)-thione (14), and -selone (15) with bromine,39b,c and more recently, for 14 and 15 with IBr.39d In this last case, the prediction of a 10-1-2 adduct for 14 IBr and a 10-Se-3 adduct for 15 IBr from the DFT calculations has been experimentally confirmed.39d... 

Se-Se-bridged dications with halide or interhalide anions can be obtained under certain conditions by halogenation of 4-imidazoline-2-selones and 4-imidazolidine-2-selones. In the solid salts, Se-Se-bridged dications exhibit significant interactions with their anions, depending on the number and the... 

Cations [(RR C=Se)2I]+ In the case of A-methylbenzothiazole-2(3//)-selone (mbts), one equivalent of iodine provides a molecular adduct in dichloromethane solution 50 crystallisation, however, leads to a ionic compound of the type [(RR C Se)2I]+I3, 43 This compound was the first one reported in the literature featuring a two coordinated iodine(I) complex with two donor molecules containing selenocarbonyl groups. In the solid state two molecules of mbts are linearly coordinating a central I+ ion to give a slightly... 

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