Picric acid physical properties

Romburgh [3] was the first to prepare this substance both by nitrating ethyl-aniline and by nitrating diethylaniline. It is comparable to tetryl in its physical and chemical properties. As an explosive it is weaker than tetryl. Its sensitiveness to impact and its explosive power, measured in the lead block, are somewhat greater than those of picric acid. 

Also, in this case, conductivity data were analyzed by Fuoss-On-sager-Skinner equations and limiting equivalent conductances A<> and association constants KA are collected in Table II together with physical properties of solvent mixtures. Furthermore, Table III shows ethanol and tert-butanol concentration in the mixture [ROH], the relevant dielectric constant c, and the pK of picric acid. 

Picric acid salts Ammonium picraic Guanidine picratc Danger produced hy picraics Tctra- and pcnia-nitro derivatives of phenol Tctranitruphenol PentanitrophennI Nitro derivatives of cresols 2.4,6-T ri n i t lo-m >creso I Physical properties C hcmical properties... 

Some of the physical constants of pyrrole and of a selection of its derivatives are collected in Table 4,1, The boiling point of pyrrole is higher than might have been expected, and the closer similarity in this property of 1-methylpyrrole to, say, toluene suggests that in pyrrole the imino group is responsible for some sort of association (see below). The characterization of pyrrole and simple alkylpyrroles through the formation of crystalline derivatives is not always easy. Picrates are usually unstable. In cases where picric acid causes dimerization, the dimer picrate is often a satisfactory derivatively, 233 xhe reaction with phenyl isocyanate (p. 66) is useful. 

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