Treatment of 1,8-(Me3GeCH2)2C10H6, derived from a Grignard in situ trapping reaction, with Li(Me2NCH2CH2NMe2)Bun in hexane yields the germanium heterocyclic dianion [CHGeMe2C(GeMe3)C10H6]2-, characterized as its protonolysis product. Potassium hydride and [1,8-(Me3PCH2)2C10H 6]Cl2 in tetrahydrofuran affords the novel bis-ylide HC=PMe2C(=PMe3)C10H6, (4), and small amounts of the mono-ylide 1-Me-8-(Me3P=CH)C10H6, (5). The ring system in (4) is planar, the heteroatom excepted (0.50 Å deviation), with Cylide-P to P-Cylide to Cylide-P distances of 1.742(4), 1.700(5), and 1.726(5) Å; cf. P-CMe ca. 1.8 and P-Cylide 1.69(1) Å in (5). The aromatic rings in (5) are twisted, the ylide carbon, which is almost 'co-planar' with the adjacent ring, and peri-methyl carbon being skewed in opposite directions.
|Number of pages||7|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - Jul 1987|