2-Methoxy-3-methyl-6-[(triphenylphosphoranylidene)amino]pyrimidin-4(3H)-one and 3-Methyl-2-methylthio-6-[(triphenylphosphoranylidene)amino]pyrimidin-4(3H)-one

Structure analyses of the 2-methoxy- [C₂₄H₂₂N₃O₂P, (1)] and 2-methylthio- [C₂₄H₂₂N₃OPS, (2)] title compounds show that while they are not isomorphous, they do have very similar conformations in the solid state. In both compounds there are deviations from ideal tetrahedral symmetry around the P atoms, e.g. N-P-C in the range 105.57 (9)-117.81 (9)° in (1) and 105.75 (12)-118.22 (13)° in (2). This is consistent with the behaviour of the methyl group signals in their NMR spectra.

-1