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Chemistry of 2,3-Dihydro-2-metallaphenalenes. Part 1. Synthesis of (R=R'=H; R=R'=SiMe3; and R,R'=H,SiMe3) and Formation of the Compound via Decomposition of 2>; Crystal Structures of two Polymorphs of the Silicon Heterocycle Dilithium ...

DOI: 10.1039/DT9840000311

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 311 - 320 (1984)

Update date:2022-08-28

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Authors:

Engelhardt, Lutz M.Engelhardt, Lutz M.

Papasergio, Rocco I.Papasergio, Rocco I.

Raston, Colin L.Raston, Colin L.

White, Allan H.White, Allan H.

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Article abstract of DOI:10.1039/DT9840000311

The complexes <2<1,8-(CHSiMe3)2C10H6>> (9) (tmen=NNN'N'-tetramethylethylenediamine) and <*> (13) have been prepared via metallation of species formed by in situ Grignard trapping reactions of 1,8-(ClCH2)2C10H6 with SiMe3Cl and SiMe2Cl2 respectively; synthesis of the siline, meso-<*> from (9) is also described.In hexane, (9) decomposes to <*> (10) to yield the compound <*> on the addition of aqueous HCl, the same product as that obtained from a reaction of (13) with SiMe3Cl.The nature of (10) has been established by X-ray structure determination of two polymorphs, α and β, which differ both in the mode of interaction of the Li(tmen)(+) moieties with the carbanion <η6:η3 (α), cf. η4:η3 (β)> and the conformation of the heterocyclic ring.

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