Potassium hexacyano cobaltate

C13C2 Hexachloroethane, 4 124 Co(CN)6K3 Potassium hexacyano-cobaltate(III), 2 225 [Co(CO)3]4 Tetracobalt dodecacar-bonyl, 2 243... 

Co(NH3)6](N03)3 Hexammineco-balt(III) nitrate, 2 218 [Co(NH3)6]2(C204)3-4H20 Hexam-minecobalt(III) oxalate, 2 220 CoNO(CO)3 Cobalt nitrosyl tricarbonyl, 2 238, 239 Co2(S04)3-18H20 Cobalt (III) sulfate 18-hydrate, 5 181 Cr(CN)sK3 Potassium hexacyano-chromate(III), 2 203 Cr (CO) t Chromium hexacarbonyl, 3 156... 

Grube gives a method whereby potassium hexacyano-cobaltate(III) can be prepared from potassium cyanide and cobalt carbonate, with subsequent oxidation of cyano-cobaltate(II) to cyanocobaltate(III), and purified by repeated crystallization from water. The following method was first described by Zwenger and later by Benedetti-Pichler. It has the advantage over Grube s method that cobalt(II) cyanide is first precipitated and washed free... 

CoNO(CO)3 Cobalt nitrosyl tri-carbonyl, 2 238, 239 Cr(CN)6K3 Potassium hexacyano-ohromate(III), 2 203 Cr(C2H302)2 Chromium(II) acetate, 1 122... 

Cobaltate (3-), hexacyano-, tripotassium Cobaltate (3-), hexakis (cyano-C)-, tripotassium. See Cobalt potassium cyanide Cobalt bis (acetylacetonate). See Cobalt acetylacetonate... 

Polyether Polyols. Polyether polyols are addition products derived from cyclic ethers (Table 4). The alkylene oxide polymerisation is usually initiated by alkah hydroxides, especially potassium hydroxide. In the base-catalysed polymerisation of propylene oxide, some rearrangement occurs to give aHyl alcohol. Further reaction of aHyl alcohol with propylene oxide produces a monofunctional alcohol. Therefore, polyether polyols derived from propylene oxide are not truly diftmctional. By using sine hexacyano cobaltate as catalyst, a more diftmctional polyol is obtained (20). Olin has introduced the diftmctional polyether polyols under the trade name POLY-L. Trichlorobutylene oxide-derived polyether polyols are useful as reactive fire retardants. Poly(tetramethylene glycol) (PTMG) is produced in the acid-catalysed homopolymerisation of tetrahydrofuran. Copolymers derived from tetrahydrofuran and ethylene oxide are also produced. 

Conventional polyether polyol technology involves alkoxylation of the starters with PO and EO using an alkali metal hydroxide catalyst such as potassium hydroxide. The catalyst can be neutralized and the neutral salt can be left in the final polyol, or optionally the catalyst can be extracted by washing with water or by deposition on an ion exchange medium. In recent years, a new catalyst technology has become widely adopted within the polyols industry, using zinc hexacyano-cobaltate (double metal cyanide catalyst, or DMC), which runs at very high... 

An alternative method of preparing highly active zinc hexacyano-cobaltate catalyst involved the use of hexacyanocobaltic acid prepared by passing the potassium salt through cationic exchange resin (Rohm and Haas A-15). 

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