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Crystal data analyses: Stoe IPDS-II two-circle diffractometer, MoK α radiation (λ, 0.71073, T =293(2) K; Graphite monochromator; numerical absorption correction. Structure solution by direct methods using SHELXS and refinement by full-matrix least-squares on F 2 using SHELXL of the X-STEP32 suite of programs [14] all non-hydrogen atoms were refined anisotropically. Crystal data for 4b: C17H11ClN2O2.(CH3) 2SO, M, 387.86 gmol-1; crystal dimensions 0.30 x 0.25 x 0.20 mm3; Triclinic, space group P1, Z=2; a, 8.7331(17, b, 9.1208(18, c, 13.834(3) Å, α, 72.82(3)°, β, 89.37(3)°, γ, 64.76(3)°; V, 943.8(3) Å3; F000, 402, ρcalc, 1.365 g cm-3; 2. 57°<θ<29.32°; section of the reciprocal lattice: -9 ≤ h ≤ 12, 12 ≤ k ≤ 12, 16 ≤ 1 ≤ 18; of 1
-3). Crystallographic data for 4b have been deposited with the Cambridge Crystallographic Data Centre. Copies of the data can be obtained, free of charge, on application to The Director, CCDC 664117, Union Road, Cambridge CB2 1EZ, UK. Fax: +44 1223 336033 or e-mail: deposit@ccdc.cam.ac.uk.