Silver cyano compounds

See other cyano compounds, silver compounds, triazenes... 

See other CYANO COMPOUNDS, SILVER COMPOUNDS, TRIAZENES... 

Cyano compounds liquid crystals, 12, 278 in silver(III) complexes, 2, 241 Cyanocuprates, with copper, 2, 186 Cyano derivatives, a-arylation, 1, 361 Cyanosilanes, applications, 9, 322 Cyclic acetals, and Grignard reagent reactivity, 9, 53 Cyclic alkenes, asymmetric hydrosilylation, 10, 830 Cyclic alkynes, strained, with platinum, 8, 644 Cyclic allyl boronates, preparation, 9, 196 Cyclic allylic esters, alkylation, 11, 91 Cyclic amides, ring-opening polymerization, via lanthanide catalysis, 4, 145... 

Evidence for the intermediacy of the enamine (138) and the immonium ion (140) derives from the condensation reaction in which potassium cyanide replaced sodium cyanoborohydride the immonium ion (140) was thus trapped by reaction with nucleophilic cyanide ion, with formation of 21-cyanotetrahydroalstonine (141a) and 21-cyanoakuammigine (141b). Both cyano-compounds suffered slow reduction to the parent alkaloid by sodium borohydride, and were re-converted (by silver acetate) into the precursor immonium ions (140), which could be rapidly reduced (NaBH4) to the alkaloids. Scheme 17 illustrates some, but not by any means all, of the numerous interconversions involved in these biomimetic experiments. 

A group of Russian workers [22 to 27] reported on the fluorination of mixtures of solid amines, amides, or cyano compounds with KF or CaF2. The reactions were carried out in a stream of F2 diluted with N2 at about -10 to +10°C. NF3 was one of the main products and was accompanied by fluorinated fragments of the compounds treated. The N-containing compounds studied include aliphatic amine hydrochlorides [22, 23], the amides of trifluoro- and difluoro acetic acid [24], potassium cyanate [25], silver and potassium thiocyanate [26], and a acetonitrile boron trifluoride complex [27]. 

Na[AuClJ, per mole of silver haHde. Coordination compounds are used as emulsion stabilizers, developers, and are formed with the weU-known thiosulfate fixers. Silver haHde diffusion transfer processes and silver image stabilization also make use of coordination phenomena. A number of copper and chromium azo dyes have found use in diffusion transfer systems developed by Polaroid (see Color photography, instant). Coordination compounds are also important in a number of commercial photothermography and electrophotography (qv) appHcations as weU as in the classic iron cyano blueprint images, a number of chromium systems, etc (32). 

See related METAL CYANIDES (AND CYANO COMPLEXES) See other SILVER COMPOUNDS... 

B-Cyano-, B-isocyanato- and B-isothiocyanato-borazines are preferably prepared by reacting the B-chloroborazines with silver cyanide 128>, cyanate, or thiocyanate 22,72,120). Also, B-azidoborazines have been obtained recently. The isolation of [HNBN]3 has been claimed in a patent 130>. This work could not be reproduced due to the explosiveness of the compound 27 123>. However, several N-organosubstituted-B-azido-borazines have been made by reaction of symmetrical and unsymmetrical B-chloroborazines with NaN3 in acetonitrile 22,123). N-Organo-B-azido-borazines can be distilled in high vacuum if suitable precautions are taken 22>. 

Treatment of a-halo ethers with metallic cyanides such as cuprous, mercuric, or silver cyanides gives the corresponding cyano ethers the alkali cyanides are without effect. Very little of the corresponding isonitriles are encountered despite the fact that these compounds often result from the interaction of heavy-metal cyanides and alkyl halides. Generally, cuprous cyanide, the most commonly used reagent, is suspended in dry anhydrous ether or dry benzene and treated with the halo ether under gentle reflux (55-80%). 

Cyano-5 10 - dihydrophenarsazine is obtained from the corresponding 10-chIoro compound and silver cyanide in benzene solution it melts with decomposition at 227° to 228° C. ... 

Nitrogen Linked to Carbon.—Now when the isomeric compound, formed with silver cyanide and the methyl halide, is decomposed with water the nitrogen of the cyanogen remains linked to the methyl carbon in the form of methyl amine and the other product contains the cyano-... 

Structure (33) has been assigned to the product obtained when PC15 reacts with the sodium salt of methane tricarbonitrile, NaC(CN)3 similar reactions occur when the PC15 is replaced by PhnPCl5 , where n = 1 or 3.330 However, if the silver salt of the nitrile is used, a cyclic compound (34) is obtained in addition to (33). Chlorine elimination occurs when N-l-cyano-alkyl-P-phenylphosphonimidic chlorides are prepared according to equa-... 

Reactions of silver(i) or sodium cyanoacetates with Cp2TiCl2 afford the bis(cyanoacetato) complex Cp2Ti(02CCH2CN)2. The molecular structure shows O-unidentate carboxylate groups the cyano-nitrogen atom is not bonded to the metal. This compound can alternatively be prepared from Cp2TiMe2 and cyanoacetic acid.1581... 

Although the compounds have not been isolated, there is strong evidence from n.m.r. spectrometry for the formation of the mixed cyano-halides P(CN) X3 , where X = Cl, Br, or I, and n = 1 or 2, in reactions between PX3 and silver cyanide in solution in 1-iodopropane/ In addition, a number of ternary mixed cyano-halides were also detected. The mean P—CN bond dissociation energy has been assessed as 84 kcal moP from data on the heats of hydrolysis and formation of crystalline P(CN)3- °... 

This net has vertex symbols 8 8-H and 8-8-8j and is thus a uniform net (having only one kind of shortest rings) with genus 5. It is formed by four-fold helices, well known by now, this lime interconnected by zigzag chains, see Figure 6.24 It is also chiral. An example can be found in the cyano-bridged iridium cyclopentadienyl silver(l)pyridinc compound in Figure 6.24 [31J. 

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