Unusual Reactivity of a C,N-Chelated Stannylene with Siloxanes and Silanols

0393289 - ÚCHP 2014 RIV US eng J - Článek v odborném periodiku
Padělková, Z. - Švec, P. - Kampová, H. - Sýkora, Jan - Semler, M. - Štěpnička, P. - Bakardjieva, Snejana - Willem, R. - Růžička, A.
Unusual Reactivity of a C,N-Chelated Stannylene with Siloxanes and Silanols.
Organometallics. Roč. 32, č. 8 (2013), s. 2398-2405. ISSN 0276-7333. E-ISSN 1520-6041
Grant ostatní: GA ČR(CZ) GPP207/10/P092; VUB(BE) RC:GOA 31; FSCRF(BE) G.0029.10; GA ČR(CZ) GA104/09/0561
Program: GA
Institucionální podpora: RVO:67985858 ; RVO:61388980
Klíčová slova: molecular- structure * crystal-structure * transesterification reactions
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 4.253, rok: 2013

The reaction of 1 with one equivalent of TEMPO and silicon grease yielded cyclo-[(L-CN)(2)SnOSn(L-CN)(2)OSiMe2O] (6a), whereas the addition of two equivalents of TEMPO afforded cyclo-[(L-CN)(L-CN-O)SnOSiMe2OSiMe2O] (6b), in which the amine nitrogen atom of one of the L-CN ligands is oxidized to N-oxide. The reaction of 1 with one equivalent of TEMPO and subsequent addition of triphenylsilanol gave (L-CN)(2)Sn(OSiPh3)(2) (5), which further reacted with air in a chloroform solution to provide [(L-CN)(L-CN=O)Sn(OSiPh3)Cl] (7), containing one of the chelating L-CN ligands in the corresponding N-oxide form. In contrast, the direct reactions of 1 with one or two equivalents of triphenylsilanol gave rise to the adduct [Sn-(OSiPh3)(2)]center dot C6H5CH2NMe2 (8a) and the salt [C6H5CH2N(H)Me-2](+)[Sn(OSiPh3)(3)](-)(8b), respectively. All compounds were characterized by NMR spectroscopy and by X-ray diffraction. Analogous reactions of 1 with activated silica were shown to yield tin-doped silica, which was characterized by powder X-ray diffraction and various spectroscopic and microscopic techniques.
Trvalý link: http://hdl.handle.net/11104/0222022