New aryl ethynylene substituted silicon-centered molecules

The reactions of substituted dichlorosilane monomers,Cl₂SiRR′, with two equivalents of lithium aryl acetylide(1), LiC ≡ C-4-C₆H₄-Ph, afford RR′Si(C ≡ C-4-C₆H₄-Ph)₂ (6: R,R′ =CH₃; 7: R = CH₃, R′ = CH=CH₂; 8: R,R′ = Ph). An isomeric mixture of meso, (R,R)- and (S,S)-Bis2-(N,N-dimethylaminomethyl)ferrocenyl]dichlorosilane (5) was used as starting chlorosilyl compound for reaction with LiC ≡ C-4-C₆H₄-Ph to give (FcN)₂Si(C ≡ C-4-C₆H₄-Ph)₂ (9). A detailedcharacterization of 6, 7, 8 and 9 has been carried out by ¹H-NMR, ¹³C-NMR, ²⁹Si-NMR, IR and UV-VIS spectroscopy. The crystal structure of 9 has been determined by X-ray diffraction analysis.