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The title compound 2, 3-diethoxycarbonyl-4-phenyl-5-morpholinylthiophene (C20H23NO5S, Mr=389. 47) was obtained by the reaction of a-thiobenzoylth-ioformmorpholine with diethyl acetylene dicarboxylate - The crystal is prismatic, spacegroup P1 ( 2), with unit cell constants 2337 observed reflections . X-ray analysis reveals that interatomic dis-tances for C(1 ) -C(2) and C(3) -C (4) are 1. 393 (4), 1. 370 (4) , respectively,which show that they are C=C double bond. The atoms of C(1 ), C(2), C(3), C(4)and S form a thiophene ring. The dihedral ang1es between thiophene ring and C(5) -C(6) -C(7) -C(8) plane, phenyl ring are 31. 42 and 43. 78, respectively. The mor-pholine ring adopts chair conformation.
The title compound 2, 3-diethoxycarbonyl-4-phenyl-5-morpholinylthiophene (C20H23NO5S, Mr = 389.47) was obtained by the reaction of a-thiobenzoylthi-ioformmorpholine with diethyl acetylene dicarboxylate - ), with unit cell constants 2337 observed reflections. X-ray analysis reveals that interatomic dis-tances for C (1) -C (2) and C (3) -C (4) are 1. 393 (4), 1. The atoms of C (1), C (2), C (3), C (4) and S form a thiophene ring. The dihedral ang1es The ring of thiophene ring and C (5) -C (6) -C (7) -C (8) plane, phenyl rings are 31. 42 and 43. 78, respectively. The mor- pholine ring chair chair conformation.