Pyrimidine, C4H4N2, itself is a water-soluble base which melts at 21° C. and possesses a narcotic smell.
It melts at 275° C. 4-Methyluracil, C5H602N2, has long been known, having first been synthesized by R.
It is a colourless solid which melts at 54° C. to a deep blue liquid.
The orthocompound melts at Io 5° C. and boils at 218° C., the para-compound melts at 54° C. and boils at 230° C. Meta-nitrotoluene (melting at 16° C.) is obtained by nitrating acetparatoluidide and then replacing the amino group by hydrogen.
The silver salt, obtained by shaking an ether solution of nitroform with freshly prepared, slightly moist silver oxide, reacts with methyl iodide to form trinitroethane, a crystalline solid which melts at 56° C. Concentrated caustic potash decomposes the latter compound, forming the potassium salt of dinitroethane, CH3 C(N02)2K.