648930-61-4Relevant articles and documents
New Hypercoordinating Organostannanes for the Modular Functionalization of Mono- and Polystannanes: Synthetic and Computational Studies**
Choi, Jung-Won,Foucher, Daniel A.,Gossage, Robert A.,Lough, Alan J.,Pau, Jeffrey,Ranne, Mokhamed,Silverthorne, Kaitlyn,Wylie, R. Stephen
, (2022/02/16)
A series of potentially hypercoordinate tin compounds derived from a substitutionally labile tosyl stannane (5) was produced to gain access to a library of propyloxybiphenyl (11), propylmethoxy (12, 14, 18, 22) or propylthioester (13, 15, 19, 23) stannanes for structure/property/polymerization investigations. Structural characterizations by single crystal X-ray diffraction of 12, 14, 18 and 19 were also undertaken. The relative energies of hypercoordinate conformers for the propylmethoxystannanes 12, 14, 18, and 22 were determined with DFT methods and the fractional abundance of conformers in the gas and solution (CHCl3) phase were estimated. Relativistic DFT calculations of 119Sn NMR chemical shifts were carried out for a series of non-hypercoordinate reference compounds and the conformers, allowing the estimation of Boltzmann-averaged chemical shifts of the hypercoordinate propylmethoxystannanes. A semi-crystalline homopolymer (25) was isolated from the dehydropolymerization of 22 using Wilkinson's catalyst. Conversion of the liable tosylated polystannane (24) to a new partially substituted polystannane (28) via nucleophile displacement reactions was achieved.
Organotin compounds bearing mesogenic sidechains: Synthesis, X-ray structures and polymerisation chemistry
Deacon,Devylder,Hill,Mahon,Molloy,Price
, p. 46 - 56 (2008/10/08)
Organotin compounds R3Sn(CH2)n+2OC 6H4C6H4Y (R3=Ph 3, Ph2Bu; Y=H, CN; n =1-3) and RX2Sn (CH2)n+2OC6H4C6 H4Y (R=Ph, Bu; Y=H, CN; X=Br, I; n=1-3) have been synthesised and characterised by 1H-, 13C-, 119 Sn-NMR and M?ssbauer spectroscopies. X-ray crystallography reveals tetrahedral geometries for Ph3Sn(CH2)4 OC6H4C6H5 and Ph3 Sn(CH2)3OC6H4C6 H4CN, a six-coordinated, bromine-bridged dimeric structure for PhBr2Sn(CH2)3OC6 H4C6H5 containing a mer-Br3 C2OSn coordination sphere about tin and a five-coordinated monomeric structure for PhBr2Sn(CH2)3 OC6H4C6H4CN. In all cases there is strong alignment of mesogenic groups in the solid-state but only PhBr2Sn(CH2)3OC6 H4C6H4CN shows any indication of liquid-crystal behaviour. Wurtz polymerisation of RBr2 Sn(CH2)5OC6H4C6 H5 (R=Ph, Bu), both of which contain non-chelating ether functions, generated polystannanes (RR′Sn)n with Mn 2.3×105; Mw 3.0× 105; Mw/Mn 1.30 and Mn 1.3×105; Mw 2.5×105; Mw/Mn 1.96, respectively, while no polymer was obtained from chelated PhBr2Sn(CH2)3 OC6H4C6H5
