| Abstract
| - 4-Hydroxypyrimidine (4HP) has two conformational forms (the hydroxyl hydrogen cis or transwith respect to the adjacent nitrogen), which are in tautomeric equilibrium with two ketonic forms,4-pyrimidinone (4PO) and 6-pyrimidinone (6PO). We have investigated the free jet absorption millimeterwavespectrum of this system, assigning the rotational spectra of 4HPcis and 4PO; the latter species is morestable by 2.0(9) kJ/mol. No lines corresponding to the trans isomer of 4-hydroxypyridine and to 6PO havebeen observed.
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