Synthesis and characterization of new silicon-centred tin-dendrimers Si[CH2CH2SnR3](4.) Single-crystal X-ray structure of the tetrahydrofuran adduct of tetrakis [2-(tribromostannyl)ethyl]silane

摘要

A series of novel first-generation silicon-centred tin dendrimers Si(CH2CH2SnR3)(4) [R = CH3 (3), Bu-i (4), C CCH3 (5), C6H4CH3-4 (6), C6H4OCH3-4 (7), (CH2)(4)OCH2CH2OCH3 (8), CH2SiMe3 (9)] was prepared by the reaction of Si(CH2CH2SnBr3)(4) (2) with the appropriate Grignard reagent or LiCH2SiMe3 in tetrahydrofuran. The new compounds were characterized by multinuclear NMR studies (H-1, C-13, Sn-119), mass spectrometry (MALDI-TOF, EI) and elemental analyses. The molecular structure of Si[CH2CH2SnBr3(THF)(2)](2)[CH2CH2SnBr3(THF)](2) (2a) was determined by single-crystal X-ray diffraction. (c) 2006 Elsevier B.V. All rights reserved.