Silver fluoride, structure

Selective reaction of the bromochloro compound 83 with silver fluoride in acetonitrile gave a good yield of the product of nucleophilic displacement of bromide with inversion of configuration, namely, 151, and treatment with an excess of the reagent afforded25 the g m-difluoride (152). With alcohols in the presence of silver triflate, compound 83 affords access to orthoesters (for example, the dimethyl compound 153), and with diols sp/ro-analogs (for example, 154, which has the orthoester structural feature of the orthosomy-cins), are obtained.88... 

The only example of a monofluoride is that of silver, although such compounds might be expected for copper and gold, in the same triad. Silver fluoride has the simple rock-salt structure, and the most recent... 

The same chiral auxiliary has been used in the cycloaddition of an optically active azomethine ylide to benzaldehyde and to l-nitro-2-(3,4-methylenedioxyphenyl)ethylene Ae ylide was generated in situ by treating (R)-(+)-/V-(l-phenylethyl)-A -cyanomethyl-A -trimethylsilylmethylamine (33) with silver fluoride. Unfortunately, no selectivity was observed in the first case and only a 3 2 preference was expressed in the second. Use of the azomethine ylide derived in the same manner from (/ )-(-)-N-(l-phenyl-2-methoxyethyl)-/V-cyanomethyl-N-trimethylsilylmethylamine (34) displayed a modest, but potentially useful, 4 1 diastereofacial selectivity in its reaction with l-nitro-2-(3,4-methylenedioxyphenyl)ethylene. The precise structure of the major and minor product was not determined (Scheme 25). 

It has the anti-CdI2 structure, with alternating double layers of silver and intercalated fluorides. It is a metallic conductor. 

Fluoride complexes of silver(III) are exemplified by the purple-red Cs2KAgF6 (elpasolite structure, octahedral Ag3+ paramagnetic with /x = 2.6/ub). Yellow MAgF4 (M = Na, Rb, K) and XeF AgF4 are diamagnetic and probably square planar [65],... 

A C.N. of 4 must also be assumed in the diamagnetic compounds AMeF4 for trivalent silver and gold. There is probably a square arrangement of the fluoride ions, as was postulated for the KBrF4-structure by Sly and Marsh 289) 155, 165, 254). 

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