Silver nitrate, thermolysis

Conversion of ekmol to eudesmals. Thermolysis of elemol (1) at 210-220 results in partial isomerization to hedycaryol (2). Addition of a trace of silver nitrate to the thermolysis leads to formation, in addition to (2), of a-eudesmol (3) and -cudcsmol (4), both in about 0.8 % yield. This transformation appears to be the first instance of silver(l) ion-catalyzed transformations involving tc-bonds. 

A solventless thermolysis method was adopted for the synthesis of size controlled Ag2S nanopartieles. In this method, silver xanthate was prepared by adding silver nitrate solution dropwise on to potassium xanthate containing each octyl, hexadecyl and carnaubyl xanthates separately in a methanolie solution. Silver xanthate precipitates that form rapidly were washed and in water/methanol mixture and methanol after centrifugation and dried. The silver xanthate was then heated to... 

Martin and Eisenmann have re-investigated the thermolysis of syn- and anti-tricyclo[4,2,0,0 ]octane (511) and (512). Both ultimately give cis,cis-cyclo-octa-l,5-diene but the re-investigation shows that cis,trans-octa-l,5-diene is also produced and that it isomerizes to the all-cis-diene under the reaction conditions. The cis,trans-diene was trapped with hexachlorocyclopentadiene, and was also characterized as its dimer or its silver nitrate complex. Both (511) and (512) give mixtures of cis,cis-and cis,trans-octadiene in a co. 3 5 ratio. Thus the single-inversion pathway usually found in the pyrolysis of bicyclo [2,2,0] hexanes is also followed, at least partially, by... 

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