Crystal structural studies of ethyl-5-(4-chlorophenylsulfonyl)-4-hydroxy-2, 6-dip-tolyl-1, 2, 5, 6-tetrahydropyridine-3-carboxylate and diethyl 4-hydroxy-2-(4-nitrophenyl)-5-(phenylsulfonyl)-6-(phenylsulfonylmethyl)cyclohexa-3,6-diene-1,3-dicarboxylate

The crystal structures of trans,trans-Ethyl-5-(4-chlorophenylsulfonyl)-4-hydroxy-2,6-dip-tolyl-1,2,5,6-tetrahydropyridine-3-carboxylate (Ia) and cis-Diethyl 4-hydroxy-2-(4-nitrophenyl)-5-(phenylsulfonyl)-6-(phenylsulfonylmethyl)cyclohexa-3,6-diene-1,3-dicarboxylate (Ib) were elucidated by single crystal X ray diffraction. Compound (Ia) C28H28Cl NO5S, crystallizes in the monoclinic system, space group P 21/c, with a = 9.4530(7) , b = 25.366(2) , c = 11.4353(8) , β = 103.092(7)°, V = 2670 (3) 3 and Z = 4. The compound (Ib), C31H29N1O11S2, crystallizes in the monoclinic system, space group P 21/c, with a = 21.179(4) , b = 8.4998(16) , c = 17.347(3) , β = 102.563(3)°, V = 3048.0(10) 3 and Z = 4. The central piperidine ring of compound (Ia) adopts the sofa conformation and the central cyclohexadiene ring of compound (Ib) adopts the boat conformation. Details of the compounds preparation, crystal structures and hydrogen bonding interactions of the compounds are discussed.