Abstract
The synthesis of new organotin compounds of general formula Tip 2SnRR′ (Tip = 2,4,6-triisopropylbenzene; R = R′ = CH 3 ( 1); R = R′ = CH CH 2 ( 2); R = CH 2Ph, R′ = Br ( 3); R = R′ = CH 2CH CH 2 ( 4)) is described herein. The compounds have been characterized by 1H, 13C, 119Sn NMR, mass spectroscopy and elemental analysis. Characterization by single-crystal X-ray diffraction analysis has been obtained for compounds 2, 3 and 4. The reactivity with ionizing agents has been studied by NMR spectroscopy. Compounds 2 and 4 underwent alkyl abstraction by [(CH 3CH 2) 3Si] +[B(C 6F 5) 4] − affording stable cationic species ( 2a, 4a). For the cationic specie 4a a π-interaction of the benzyl group to the metal centre was recognized by solution NMR studies. A cationic species ( 3a) was generated from compound 3 using AgSbF 6 as ionizing agent. The cationic species ( 2a, 3a) exhibited moderate activity as initiator in the cationic polymerization of 1,4-butadiene and good activity in the ring opening polymerization (ROP) of propylene oxide and ε-caprolactone.
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