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Ethylenediamine reacts with chlorosilanes to give N,N′-bis(silyl)ethylenediamines [(H 2 CNHSiRR′R″) 2 , 3: R, R′ = Me; R″ = CMe 3 ; 4: R = H; R′, R″= CMe 3 ; 5: R,R′ = CMe 3 , R″ = OH]. In the reaction of N,N,N′-tris(trimethylsilyl)ethylenediamine with SiF 4  the difluoro-bis(1.1.4- tris(trimethylsilyl)ethylenediamino)silane (6) is obtained. The 1.3-diaza-2-silacyclopentanes R 2 Si[N(SiMe 2 R′)CH 2 ] 2 , 7 - 10 (7: R = Cl, R′= Ph; 8: R = Cl, R′ = CMe 3 ; 9: R = H, Cl, R′ = CMe 3 ; 10: R = Br, R′ = CMe 3 ) are isolated from the reactions of the corresponding bis(silyl)ethylenediamines and halosilanes in Et 2 O with NEt 3  as HHal acceptor. Dilithium derivatives of N,N′-bis(silyl)ethylenediamines react with fluorosilanes with formation of the 1.3-diaza-2-silacyclopentanes, R 2 Si[N(SiMe 2 R′)CH 2 ] 2  (11 - 13) (11: R = F,R′ =Me; 12: R = F, R′ = CMe 3 ; 13: R = CHMe 2 , R′ = Me). N-Fluoro-di(tert-butyl)silyl-N,N′-bis(trimethylsilyl)- ethylenediamine (14) is formed in the reaction of lithiated bis(trimethylsilyl)ethylenediamine with F 2 Si(CMe 3 ) 2 . 8 reacts in amolar ratio 1:2 withNaNH 2  or NaOMe with formation of 15 and 16, respectively · R 2 Si[N(SiMe 2 CMe 3 )CH 2 ] 2 , 15: R = NH 2 ; 16: R = OMe]. 1.3-Bis(tert-butyldimethylsilyl)- 2-tert-butyldimethylsiloxy-2-fluoro-1.3-diaza-2-silacyclopentane is the product of the reaction of 12 with LiOSiMe 2 CMe 3 . The crystal structures of 6 and 13 have been determined.

zeitschrift für naturforschung b

N,N′-Bis(silyl)ethylendiamine und 1,3-Diaza-2-silacyclopentane – Synthese, Reaktionen, Strukturen/ N,N′-Bis(silyl)ethylenediamines and 1.3-Diaza-2-silacyclopentanes – Synthesis, Reactions, Crystal Structures