2273-51-0Relevant articles and documents
Structural characterization of N-methylpyridoxine (MePN; PN = vitamin B6) and its diorganotin complexes [SnR2(MePN-H)]I (R = Me, Et, Bu and Ph)
Casas, Jose S.,Castineiras, Alfonso,Condori, Felix,Couce, Maria D.,Russo, Umberto,Sanchez, Agustin,Sordo, Jose,Varela, Jose M.
, p. 2790 - 2797 (2003)
For comparison with the corresponding pyridoxine complexes we have prepared dimethyl-, diethyl-, dibutyl- and diphenyltin(IV) complexes of N-methylpyridoxine (MePN). The compounds [SnMe2(MePN-H)]I (1), [SnEt2(MePN-H)]I (2), [SnBu2(MePN-H)]I (3) and [SnPh 2(MePN-H)]I·H2O (4) were isolated and characterized by IR, Raman, Moessbauer, 1 13C and 119Sn NMR spectroscopy, and by EI and FAB mass spectrometry. The crystal structures of [HMePN]I and of compounds 1, 2·2H2O and 3 were determined by X-ray diffractometry. Their lattices contain dimeric [SnR2-(MePN-H)]22+ units (R = Me, Et, Bu) in which two bridging-chelating methylpyridoxinato anions link pentacoordinate Sn atoms with coordination polyhedra closer to square pyramids than to trigonal bipyramids. NMR results show that the dimeric cations persist in (CD 3)2SO. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
Study on the transesterification and mechanism of bisphenol A and dimethyl carbonate catalyzed by organotin oxide
Liang, Yanan,Su, Kunmei,Cao, Lei,Gao, Yuan,Li, Zhenhuan
, p. 2171 - 2182 (2019/06/21)
(CF3C6H4)2SnO, (CH3C6H4)2SnO and Ph2SnO were successfully synthesized for the transesterification of DMC with BPA. The products of mono-methylcarbonate-ended-BPA (MmC(1)) and two-methylcarbonate-ended-BPA (DmC(1)) were selectively synthesizedthem. The catalysts were characterized by FT-IR, TG and XPS. When Ph2SnO was used as the catalyst at 170?°C, the BPA conversion reached to 28.60% and the transesterification selectivity reached to 98.35%. As for (CF3C6H4)2SnO, BPA conversion and transesterification selectivity declined to 12.48% and 64.74%, respectively. The BPA conversion increased to 42.83%, but the transesterification selectivity declined to 44.55%(CF3C6H4)2SnO. Notability, the higher transesterification selectivity of Ph2SnO was due to its lowest electron binding energy of Sn4+. More importantly, the DMC adsorption, activation and decomposition process(CF3C6H4)2SnO, (CH3C6H4)2SnO and Ph2SnO were characterized by TG–MS and in situ DRIFT techniques, which provided more information about the mechanism of transesterification and methylation.
Structure, properties and cytostatic activity of triorganotin (aminoaryl)carboxylates
Pruchnik, Florian P.,Banbula, Malgorzata,Ciunik, Zbigniew,Chojnacki, Henryk,Latocha, Malgorzata,Skop, Barbara,Wilczok, Tadeusz,Opolski, Adam,Wietrzyk, Joanna,Nasulewicz, Anna
, p. 3214 - 3221 (2007/10/03)
The properties of vinyltin and phenyltin complexes [Sn(CH=CH2)3{μ-OOCC6H3 (NH2)2-3,4}]n (1), [Sn(C6H5)3- {OOCC6H3(NH2)2-3,4}] (2), [Sn(C6H5)3{OOC-2-C6H4 N= NC6H4N(CH3)2-4})] (3) and [Sn(CH=CH2)3{OOC-2-C6H4N= NC6H4N(CH3)2-4}] (4) have been investigated. The structures of complexes 1, 2, and 3, have been determined by X-ray crystallography, Compound 1 is a distorted trigonal-bipyramidal complex and compounds 2 and 3 adopt a distorted tetrahedral structure. Complex 1 is a single-strand polymer with a bridging 3,4-diaminobenzoato ligand coordinating via the O(1) atom of the carboxylato group and the nitrogen atom of the para-amino group. The oxygen and nitrogen atoms occupy the axial coordination sites. The Sn(1)-N(2A) bond is weak. In complexes 2 and 3 the carboxylato hgands are strongly coordinated to the central atom via one oxygen atom, and the Sn(1)-O(2) distances are considerably longer. Weak interactions of the central atom with the amino group in complex 1, and with the O(2) atoms in complexes 2 and 3, as well as the hydrogen bonds, stabilize the crystal structure. The complexes are effective cytostatic agents. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.
