Propanoyl chloride, 3-bromo- → 3-(3'-Bromopropionyl)oxymethyl-5,5-diphenyl-2,4-imidazolidinedione

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5,5-Diphenyl-3-hydroxymethyl-2,4-imidazolidinedione (5 g, 0.018 tool) was reacted according to the procedure of Example 142 with 3-bromopropionyl chloride (6.8 g, 0.04 mol, 4 ml), using a bath temperature of 100° C. A white crystalline product was obtained in 65% yield (4.9 g), m.p. 133°-134° C. Anal. calc. for C19H17N2O4Br: C, 54.69; H, 4.11; N, 6.72; Br, 19.15. Found: C, 54.79; H, 4.12; N, 6.69; Br, 19.25. The product has the formula: ##STR1523##

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