DiSelenide, carbon

The reaction of ethyleneimine (and detivatives) with carbon oxysulfide yields 2-thiazohdinone [2682-49-7J (256,257). Carbon disulfide and ethyleneimine react to give 2-thiothia2ohdine (258—260). Carbon diselenide reacts with azitidines to form 2-selena2obdineselenones (261). 

According to Hofman-Bang carbon sulfide selenide, CSSe, catalyzes the iodine-azide reaction but is at the same time decomposed with the formation of selenium. Experiments, in both this laboratory and that of Hofman-Bang have shown that carbon diselenide reacts with sodium azide (in aqueous or aqueous-alcoholic solution) with immediate precipitation of red selenium even at — 20° C. //a selena-triazole is formed in this reaction it must be extremely unstable. 

Carbon dioxide supply, for the molten carbonate fuel cell, 72 220 Carbon dioxide ternary systems, phase behavior of, 24 4—5 Carbon diselenide, 22 75t Carbon disulfide, 4 822-842 23 567, 568, 621. See also CS2 in cellulose xanthation, 77 254 chemical reactions, 4 824—828 diffusion coefficient in air at 0° C, 7 70t economic aspects, 4 834-835 electrostatic properties of, 7 621t handling, shipment, and storage, 4 833-834... 

A preparative route to 4,5-benzo-l,3-diselenol-2-selones (63) is based on the ready decomposition of benzoselenadiazoles (62) in boiling carbon diselenide (Equation (6)) <83CC295>. Thermal and photochemical decomposition of 1,2,3-benzoselenadiazole gave successively benzoseleniren (64) and 6-fulveneselone (65) as very reactive products <80AG(E)69,83ZN(B)611,84TL2337> (Scheme 2). 

Both of the foregoing varieties of amorphous selenium are somewhat soluble in carbon disulphide, but selenium chloride, carbon diselenide and methylene iodide are better solvents.4 On account of its finer state of division the red form appears more soluble. Discordant results are easily obtained with such solutions because of the tendency to change, especially on warming, into the less soluble crystalline variety —generally the monoclinic form. 

Selenium boils at about 690° C.,4 forming a vapour the colour of which is intermediate between that of chlorine and that of sulphur. The element can be sublimed and distilled at a much lower temperature under very low pressure.5 When selenium is heated on charcoal the vapour has an odour resembling that of rotten radishes this has been attributed to the formation of a small quantity of selenium suboxide, but it is more probably due to the formation of carbon diselenide.8... 

Carbon Diselenide, CSe2, has been produced in very small quantity by the action of carbon tetrachloride vapour on the selenide... 

Complexes with carbon disulfide and carbon diselenide 486... 

The carbon diselenide and carbon sulfide selenide complexes of platinum(0) can be synthesized from Pt(PPh3)3. Reaction of the compounds with chelating phosphines results in substitution of the triphenylphosphines (equation 541).1866 With COS the C,S-bonded compound Pt(COS)(PPh3)2 is formed from Pt(PPh3)3. The reaction can also be used to prepare the dithiocarbonato complex Pt(S2CO)(PPh3)2.1867... 

Carbon diselenide is an evil-smelling liquid, and COSe and CSSe are also known. 

Carbon diselenide CSe2 Carbonyl selenide COSe. Hydrogen selenide HjSe... 

The synthesis of substituted sclcnolo 2,3-/ ]thiophcncs 208 and selenolo [2,3-b selenophenes 209 via ketene dithioacetals has been published (Scheme 40) [55], The easy access to ketene dithioacetals via carbon disulfide cannot be applied to selenium since the strongly odorous carbon diselenide cannot be readily prepared. The authors [55] overcame this problem using sodium selenide for the synthesis of selenolo[2,3-/ thiophcncs 208, which could be synthesized from methylsulfanylthiophenes 206 and sodium selenide and/or from 5-methylsulfanylselenophenes 207 and thioglycolate. 

A theoretical study of the mechanism of ruthenium-catalyzed formation of pyran-2-one and the corresponding sulfur and selenium analogues 8 from acetylene and CX2 (X = O, S, Se) has been reported (Equation 3) <2004NJC153>. This cyclotrimerization reaction has been experimentally carried out using carbon disulfide as a substrate <2002JA28>. The proposed mechanism involves formation of a bicyclic metal carbene intermediate. Formation of this intermediate seems to be particularly unfavorable energetically in the case of carbon diselenide. 

Phenacyl selenocyanate and arenediazonium chlorides afford 5-benzoyl-2-imino-2,3-dihydro-l,3,4-selenadiazoles (182 Scheme 76) (80BCJ1185). 4-Substituted 3-selenosemicar-bazides (183), by a cyclocondensation reaction with carbon diselenide, afford 5-substituted 3H-l,3,4-selenadiazoline-2-selones (168) and (170). Compound (183 R = p-tolyl) and thiophosgene give (169 Scheme 77) (77JOC3725). 

Methyl propiolate and DMAD add to carbon diselenide under high pressure to give 1,4,5,8-tetraselenafulvalenes (101) and (102). The dimerization of a l,3-diselenole-2-carbene is implicated (81CC669). The alkynes function as the two-atom unit while carbon diselenide is the three-atom unit. 

The electrochemical reduction of carbon diselenide in the presence of methyl iodide generated tetraselenafulvalene (107) (76CC148). Six carbon diselenide molecules were necessary for each molecule of product generated. 

Carbon selenide telluride is a thermally very unstable compound that cannot be sublimed in a high vacuum. The compound was claimed to have been obtained in 8% yield from carbon monoselenide, generated from carbon diselenide in a high frequency discharge, and gaseous tellurium. The infrared spectrum of carbon selenide telluride was recorded. No details about the reaction conditions were reported1. 

Elementary fluorine or chlorine may act drastically on a number of covalent compounds, forming products in which the only bonds remaining are eiement-to-halogen bonds. Such reactions are called halogenolyses the chlorinolysis of carbon diselenide and the fluorinolysis of ethane are typical ... 

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