Bis(2,4,6-triisopropylphenyl)tin(IV) compounds: Synthesis, single-crystal X-ray characterization and reactivity toward ionizing species and polar monomers

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• 作者：Liana Annunziata ; Daniela Pappalardo ; Consiglia Tedesco ; Simona Antinucci and Claudio Pellecchia
• 关键词：Tin ; Cationic species ; Single crystal X-ray characterization ; Polymerization
• 刊名：Journal of Organometallic Chemistry
• 出版年：2006
• 出版时间：1 April 2006
• 年：2006
• 卷：691
• 期：8
• 页码：1505-1514
• 全文大小：367 K

文摘

The synthesis of new organotin compounds of general formula Tip₂SnRR′ (Tip = 2,4,6-triisopropylbenzene; R = R′ = CH₃ (1); R = R′ = CHCH₂ (2); R = CH₂Ph, R′ = Br (3); R = R′ = CH₂CHCH₂ (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 [(CH₃CH₂)₃Si]⁺[B(C₆F₅)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 AgSbF₆ 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.