Chlorides selenium dioxide

The monochloride is soluble in various inert organic liquids, more particularly in benzene, chloroform, carbon tetrachloride and carbon disulphide, without undergoing chemical change. It is an exothermic compound, its heat of formation from gaseous chlorine and the amorphous modification of selenium being 22-1 Cals.1 Water causes a gradual decomposition of the chloride, selenium dioxide and selenium being formed 2... 

Methanesulfonyl chloride Selenium dioxide Potassium hydroxide... 

Alkyl Isoquinolines. Coal tar contains small amounts of l-methylisoquinoline [1721-93-3] 3-methylisoquinoline [1125-80-0] and 1,3-dimetliylisoquinoline [1721-94-4J. The 1- and 3-methyl groups are more reactive than others in the isoquinoline nucleus and readily oxidize with selenium dioxide to form the corresponding isoquinoline aldehydes (174). These compounds can also be obtained by the hydrolysis of the dihalomethyl group. The 1- and 3-methyhsoquinolines condense with benzaldehyde in the presence of zinc chloride or acetic anhydride to produce 1- and 3-styryhsoquinolines. Radicals formed by decarboxylation of carboxyUc acids react to produce 1-aIkyhsoquinolines. 

In 1956, the alkaloid Methylpseudolycorine (101) isolated from the King Alfred daffodil (Narcissus pseudonarcissus L.) was oxidized to the pale yellow chloride with selenium dioxide (Scheme 36). Conversion into the betaine was accomplished by aqueous ammonia to give yellow prisms of the trihydrate of Criasbetaine (100) (56JA4145, 56JA4151). The UV absorption... 

Heating the bis(trichloromethyl)benzene with potassium nitrate, selenium dioxide or sodium chlorate to effect conversion to the bisfacyl chloride) led to eruptions at higher temperatures, and was too dangerous to pursue. 

Heisinger, J.F., C.D. Hansen, and J.H. Kim. 1979. Effect of selenium dioxide on the accumulation and acute toxicity of mercuric chloride in goldfish. Arch. Environ. Contam. Toxicol. 8 279-283. 

The studies by Gilman et al. and Sawicki on the nitration of derivatives of 2- and 3-aminodibenzothiophene have made available for the first time diaminodibenzothiophenes in which both amine functions are present in the same ring. Eeduction of 2-amino-1-nitrodibenzothiophene with stannous chloride yields 1,2-diaminodibenzothiophene (80%). As expected this compound reacts readily with acetic acid to give the imidazole (104) and with selenium dioxide to give the selenadiazole... 

Pyridinedicarboxylic acid, 2696 Rhenium chloride trioxide, 4045 Rhenium hexamethoxide, 2603 Rhenium nitride tetrafluoride, 4344 Selenium dioxide, 4838... 

Selenium oxychloride may be prepared by several methods (1) by passing chlorine gas into a suspension of selenium dioxide in carbon tetrachloride, (2) by heating thionyl chloride, SOCE, with selenium dioxide, (3) by dehydration of dichloroselenious acid, H2Se(CE)02, and (4) by fusion of selenium dioxide, selenium, and calcium chloride. 

The synthesis and preliminary biological activity of substituted 7-alkylseleno-l,4-dihydro[l,6]naphthyridines have been reported <2000DOC218> along with their further synthetic ttansformations <2001RCB122>. There have also been reports of the preparation of selenium-containing fused heterocycles. The C=0 function in benzothiophen-3-ones, 3,4-dihydrothiopyrano[3,2-. ]benzothiophen-4(2//)-ones, and 3,4-dihydro-2//,5//-thiopyrano[2, 3 4,5]thiopyrano[3,2-/ ]ben-zothiophen-4-ones reacts with selenium dioxide and thionyl chloride to give fused 1,2,3-selena and thiadiazoles via their semicarbazones <1999IJB308>. 

The nonclassical heterocycles 17 and 54 are prepared in high yields by the reaction of diamine 204 with thionyl chloride or A -thionylaniline and trimethysilyl chloride in pyridine (Equation 135). The corresponding selenium analogues were prepared by reaction of 193 with selenium dioxide (Table 15) <1995JA6791, 1997T10169>. 

Other methods of preparing flavone include the action of ethanolic alkali on 2 -acetoxy-a,/3-dibromochalcone 7 Claisen condensation of ethyl o-ethoxybenzoate and acetophenone, and cyclization of the resulting 1,3-diketone with hydriodic acid 8 and treatment of 3-bromoflavanone with potassium hydroxide in ethanol.9 Flavone has also been prepared from ethyl phenyl-propiolate by condensation with sodium phenoxide and subsequent cyclization with phosphorus pentachloride in benzene 10 by fusing o-hydroxyacetophenone with benzoic anhydride and sodium benzoate 11 by the dehydrogenation of 2 -hydroxychal-cone with selenium dioxide 12 and by the action of alkali on flavylium chloride.13... 

Phenanthrenequinone has been prepared by treatment of phe-nanthrene with chromic acid in acetic acid 5 potassium dichromate in sulfuric acid 3-6 hydrogen peroxide in acetic acid 6 7 and selenium dioxide above 250°.8 It can also be prepared from benzil with aluminum chloride at 120° 9 and from biphenyl-2,2 -dialdehyde with potassium cyanide.10... 

Oils Edible Safflower Potassium Binoxalate Ammonium Chloride Salicylic Acid Ammonium Chloride Lead Acetate Potassium Binoxalate Sodium Silicofluoride Ammonium Carbonate Fluocilicic Acid P-Dichlorobenzene Ammonium Phosphate Sec-Butyl Acetate Sec-Butyl Alcohol Calcium Phosphate Selenium Trioxide Selenium Dioxide Selenium Dioxide Selenium Dioxide Selenium Trioxide Antimony Trioxide Calcium Hypochlorite Carbaryl Cyclohexanone Charcoal... 

The isomerization of allyl ethers to 1-propenyl ethers, which is usually performed with potassium tert-butoxide in dimethyl sulfoxide, can also be carried out under milder conditions using tris(triphen-ylphosphine)rhodium chloride,208 and by an ene reaction with diethyl azodicarboxylate,209,210 which affords a vinyl ether adduct. Removal of an O-allyl group may be achieved by oxidation with selenium dioxide in acetic acid,211 and by treatment with N-bromosuccinimide, followed by an aqueous base.201,212... 

The chloride has no action on selenium dioxide even at high temperatures or under great pressure.2 Sulphuryl chloride reacts with tellurium with the sulphuryl chloride in excess the reaction is ... 

By various methods from selenium dioxide for example, by the action of hydrogen chloride, thionyl chloride or phosphorus pentachloride. The last-named is perhaps the most convenient chlorinating agent. A mixture of the pentachloride and the dioxide is heated until chemical change causes it to solidify. Phosphorus oxychloride can be distilled off with the aid of a current of carbon dioxide and the residual selenium tetrachloride purified by sublimation.8... 

This reaction may also be effected by mixing together the selenium dioxide and the dehydrating agent, passing in hydrogen chloride in the cold and then distilling off the oxychloride.4... 

Selenium oxychloride is also formed when selenium dioxide is heated with sodium chloride 6... 

Carbon monoxide has no action on selenium oxychloride.2 Water causes decomposition of the liquid into selenium dioxide and hydrogen chloride. Anhydrous ammonia reacts according to the equation. -... 

Chloroselenic Acid, (Se03.HGl)2, has been described as a pale yellow liquid obtained wrhen dry hydrogen chloride and selenium trioxide (see p. 331) are allowed to combine in a cooled vessel.1 It has a density of 2-26, and solidifies at —46° C. It fumes in air owing to the escape of hydrogen chloride, which gas is also evolved on heating, selenium and selenium dioxide remaining. 

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