Dithiaaromatic systems. II. Thieno[3,2-c] - and thieno[2,3-c]thiapyrylium perchlorates

Abstract

Thianaphtheno [2,3-c] thiapyrylium Perchlorate (4).-A refluxing solution of 0.88 g (0.004 mol) of 21 in 15 ml of acetic acid was treated with a solution of 1.37 g (0.004 mol) of trityl perchlorate in 15 ml of nitromethane, and the product was isolated as in the preparation of 1. The crude product, yield 1.10 g (91%), was recrystallized several times from glacial acetic acid to give the pure thiapyrylium salt (4): mp 207.0-208.0°; visible and uv max (1% perchloric acid in acetonitrile) 292 µ (log e 4.24), 354 (4.18), and 433 (3.52); nmr (CF8C02D) 8 10.40 (m, 1, / = 2

Conversion of ureidomalonates and 5-carbalkoxyhydantoins to 5-ureido-4,6-pyrimidinediones

“…9-Ethyl-8-hydroxyguanine (7,R = Et).-The solid obtained by method A was crystallized from dilute potassium hydroxideglacial acetic acid: yield 52%; mp 359-360°; uv max (H20) 247 and 294 µ at pH 7. Anal.20 Caled for C7H9N502: C, 43.10; H, 4.65; N, 35.90. Found: C, 42.97; H, 4.45; N, 31.80 (normal digestion time); N, 34.38 wise.…”