New Monomers for Organometallic Poly-p-xylylenes: Synthesis of Silyl-, Germyl- and Stannyl[2.2]paracyclophane Derivatives
✍ Scribed by Elena Popova; Dmitrii Antonov; Elena Sergeeva; Evgenii Vorontsov; Adam Stash; Valeria Rozenberg; Henning Hopf
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 190 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Symmetrically 4,16-disubstituted (3a-c) and bridged (6a, b) bis(trimethylsilyl)[2.2]paracyclophane (3a) we also examined the Grignard reaction, and as a result the first successful use organometallic paracyclophane derivatives have been synthesized for use as monomeric precursors of or-of a 4,16-bis Grignard reagent is described. According to the spectral data, the bridged compounds 6a, c are formed as ganometallic poly-p-xylylenes. Both types of compounds were obtained by lithiation of the appropriately substituted diastereomeric mixtures of a meso-and a d,l form. The diastereomers were separated by fractional recrystallization paracyclophane bromides (1 or 4) and subsequent quenching of the resulting lithioparacyclophane derivatives with and characterized. organometallic electrophiles. For the synthesis of 4,16-