Remarkable Conversion of 2-Thioxo-2,3-dihydroquinazolin-4(1H)-ones into the Corresponding Quinazoline-2,4(1H,3H)-diones: Spectroscopic Analysis and X-Ray Crystallography

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="10"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Compound No.</td><td class="align_center">UV-Vis (nm, <i>λ</i><sub>max</sub>)</td><td class="align_center" colspan="8">IR (cm<sup>−1</sup>, <i>ν</i>)</td></tr><tr class="thead"><td class="align_center">MeOH</td><td class="align_center">CH<sub>2</sub>Cl<sub>2</sub></td><td class="align_center">NH stretching</td><td class="align_center">CH aromatic stretching</td><td class="align_center">CH aliphatic stretching</td><td class="align_center">C=O stretching</td><td class="align_center">C=C stretching</td><td class="align_center">C=S stretching</td><td class="align_center">C-C stretching</td></tr><tr><td class="thead-hr" colspan="10"><hr/></td></tr><tr><td class="align_left"><b>3</b></td><td class="align_center">343.0</td><td class="align_center">344.8</td><td class="align_center">3248</td><td class="align_center">3033</td><td class="align_center">2901</td><td class="align_center">1657</td><td class="align_center">1522</td><td class="align_center">1205</td><td class="align_center">1393<br/>1268<br/>991</td></tr><tr><td class="align_left" rowspan="3"><b>11</b></td><td class="align_center" rowspan="3">345.4</td><td class="align_center" rowspan="3">349.4</td><td class="align_center" rowspan="3">3196</td><td class="align_center" rowspan="3">3050</td><td class="align_center" rowspan="3">2940</td><td class="align_center">1727</td><td class="align_center">1515</td><td class="align_center" rowspan="3">—</td><td class="align_center">1270</td></tr><tr><td class="align_center">1634</td><td class="align_center">1448</td><td class="align_center">1121</td></tr><tr><td class="align_center"> </td><td class="align_center"> </td><td class="align_center">1072</td></tr><tr class="table-tr"><td colspan="10"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>UV-Vis and IR spectra of compounds <b>3</b> and <b>11</b>.</div>

Journal of Chemistry

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Table 2

Table 2: Remarkable Conversion of 2-Thioxo-2,3-dihydroquinazolin-4(1H)-ones into the Corresponding Quinazoline-2,4(1H,3H)-diones: Spectroscopic Analysis and X-Ray Crystallography 

Table 2 | Remarkable Conversion of 2-Thioxo-2,3-dihydroquinazolin-4(1H)-ones into the Corresponding Quinazoline-2,4(1H,3H)-diones: Spectroscopic Analysis and X-Ray Crystallography 