Oxyselenides

CYANOGEN BROMIDE CYANOGEN CHLORIDE CYANOGEN FLUORIDE CARBON MONOXIDE CARBONYL SULFIDE CARBON OXYSELENIDE CARBON DIOXIDE CARBON DISULFIDE CARBON SELENOSULFIDE CYANOGEN... 

COSe CARBON OXYSELENIDE 525.5520 -9.1072E+03 -2.4172E+02 4.5341E-01 -3.1974E... 

Example 2, in addition to oxyselenide formation, carbo- and heteroseleno cycliza-tion, A -PSP can be used to generate selenides from alcohols and selenol esters from carboxylic acids, respectively, in the presence of a stoichiometric amount of n-Bu,P. ... 

Carbon Oxyselenide, COSe.—By the action of carbonyl chloride on cadmium selenide heated to redness, von Bartal 4 obtained a gas which contained selenium and which was probably carbon oxyselenide. The gas did not liquefy at — 80° C. 

Oxyselenides of terpenes have been electrochemically synthesized in high yields and with high regioselectivity in an MeOH (or AcOH, HjO/MeChO-f NX (X = Cl, Br, I)—(PhSe)2—(Pt) system in the presence of a small amount of sulfuric acid (Scheme 3-17). The oxyselenation proceeds through regenerating a halonium ion... 

The reaction of cyclohexene with AT-(phenylseleno)phthalimide in the presence of (S,S)-hydrobenzoin in methylene chloride afforded two diastereomeric oxyselenides (38 and the (li , 2R) diastereomer) in a 1 1 ratio. Compound 38 was separated and converted into the olefin 39 via selenoxide elimination. The second PhSeOTf promoted oxyselenenylation reaction gave only the cis fused bicyclic dioxane 40. Oxidation and subsequent elimination provided the olefin 41. This is the key intermediate for the syntheses of the cyclitols 42 and 43, that were obtained from a series of classical reactions as indicated in the Scheme. Oxyselenenylation reactions have also been employed to promote glycosylation reactions [43]. 

When the oxyselenides are further oxidized, PhSeOH is eliminated and allylic oxy-compounds are formed [58]. This procedure can be accomplished using catalytic amounts of PhSeSePh, as in Eq. (27) [59, 60],... 

As discussed in Section 1.07.3, several kinds of seleniranes and telluriranes can be synthesized by the reactions of alkenes with the atomic chalcogen generated in the flash photolysis. In the case of seleniranes, carbon diselenide or carbon oxyselenide were used as the source of the selenium atom, while dimethyltelluride was subjected to the flash photolysis to provide the reactive tellurium atoms which react with alkenes to give the expected telluriranes. 

COSe CARBON OXYSELENIDE 21.912 9.2794E-02 -9.7014E-05 5.0943E-08 -1.0615E-11 100 1500 gas... 

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