Selenocyanic acid

Phenyl selenocyanate Selenocyanic acid, phenyl ester (8, 9) (2179-... 

Solutions containing [MoOCl5]2- react with thiocyanic or selenocyanic acid to produce [MoO(NCS)5]2 and [MoO(NCSe)5]2 , respectively. Magnetic, vibrational and electronic spectra indicate that in both anions the ligands are N-bonded, forming monomeric complexes with close similarities to the corresponding halide [MoOX5]2 species. 

Selenocyanic Acid, HCNSe, may be prepared in solution by decomposing the lead salt (obtained by treating potassium selenocyanate with lead acetate) with hydrogen sulphide.3 It is stable only in neutral or alkaline solution. Selenocyanuric acid has been obtained 4 as a red amorphous powder by the action of cyanuric chloride on sodium selenide and subsequent precipitation by acids. 

Calcium, Strontium and Barium Selenocyanates have been prepared7 by dissolving the corresponding carbonates in selenocyanic acid and evaporating over sulphuric acid in vacuo. The calcium salt crystallises in groups of stellate crystals the strontium salt separates out in well-defined prisms, while the barium salt is also crystalline. 

Magnesium Selenocyanate, Mg(CNSe)2, has been prepared by dissolving magnesium oxide in selenocyanic acid. On evaporation the salt is obtained as a gummy mass, apparently devoid of crystalline structure.2... 

Compounds of these ions do not occur frequently in the lists of thermodynamic data some of the few results available are given in Table VII. The dissociation constants of hydrocyanic, hydrazoic, cyanic, thiocyanic, and selenocyanic acids are in the approximate ratios 1 10 10 10 10 (123). Some thermodynamic functions of these acids have been obtained, but no attempt was made to confirm that the latter three acids were indeed the N-bonded compounds and that the X-bonded isomers were absent (123). Hydrogen bonding between these acids and various bases has been studied but will not be considered further in this review (see, e.g., Refs. 68 and 362, and references therein). Some electronegativities are also included in Table VII of the cases quoted, only Huheey (394) considered both possible atoms and he assumed -tri di di hybridization in each case. 

SYNS SELENOCYANIC ACID, 2-OXO-2-(PHENYLAMINO)ETHYL ESTER SELE.NOCYANIC ACID, ESTER WITH a-HYDROXYACETANILIDE... 

Thiocyanates and selenocyanates can be made by fusing the corresponding cyanide with S or Se. The SCN and SeCN ions are both linear, like OCN . (See p, 779 for TeCN ) Treatment of KSCN with dry KHSO4 produces free isothiocyanic acid HNCS, a white crystalline solid which is stable below 0° but which decomposes rapidly at room temperatures to HCN and a yellow solid H2C2N2S3. Thiocyanic acid, HSCN, (like HOCN) has not been prepared... 

Selen-verbindung, /. selenium compound, -wasserstoff, m, hydrogen selenide. -was-serstoffsaure, /. hydroselenic acid, -wismut-glanz, m. guanajuatite. -zelle, /. selenium cell, -zyanid, n. selenium cyanide seleno cyanate. -zyankalium, n. potassium selenocyanate. 

However, selenium and tellurium do not react with hydrogen, so the hydrogen compounds are prepared by reacting the elements with a metal, then treating it with an acid. Selenium and tellurium undergo addition reactions with cyanides to yield selenocyanates and tellurocyanates ... 

Further papers in this section include the hydrosilylation of a-pinene and of j8-pinene, ° thiocyanation and selenocyanation of a-pinene, ° cationic polymerization of a- and /3-pinene epoxides,bromination of ( )-c/s-pinonic acid with dioxan dibromide, and straightforward myrtenol (224 R=CH20H) ° and tetrahydroperillyl alcohol syntheses from -pinene epoxide. 

Alkyl phenyl setenides selenol esters. N-PhcnylscIcnophthalimidc is superior to aryl selenocyanates for conversion of alcohols to alkyl phenyl selenides (6, 252-253) and of carboxylic acids to selenol esters (7, 396-397). When conducted in the presence of an amine the latter reaction provides amides in high yield (equation l). ... 

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