Tetrasila pyrrolophane

N,N, 1,1,2,2,8,8,9,9-Decamethyl-1,2,8,9-tetrasila[2.2](2,5)pyrrolo-phane (30) is prepared by a procedure similar to that applied to 28 and 29 through l,2-bis(A(-methylpyrrolyl)disilane 31 with slight modification of the reagents. The lithiation was performed with f-BuLi/ TMED. Under dilute conditions pyrrolophane 30 was obtained in 4% yield from 31 as air-stable colorless crystals besides a polymeric residue (35) (Scheme 7). 

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