Eight new diorganotin(IV) complexes (1a-2d), namely {[X-C6H4(O)C=N-N=C(Me)COO]R2Sn(CH3OH)}(n) (1a, 2a), {[X-C6H4(O)C=N-N=C(Me)COO]R2Sn(CH3OH)}(2) (1b, 1c, 1d, 2b), and {[X-C6H4(O)C=N-N=C(Me)COO]R2Sn}(2) (2c, 2d) (X = H-, p-Me-, p-OH-, p-NO2-; R = o-Cl-C6H4CH2- or o-Me-C6H4CH2-), have been synthesized by microwave "one-pot" reaction with arylformylhydrazine, pyruvic acid, and the corresponding R2SnCl2. All the complexes have been characterized by FT-IR (Fourier transform infrared spectroscopy), multinuclear NMR (H-1, C-13, and Sn-119 nuclear magnetic resonance spectroscopies), HRMS (high-resolu...