η2-Alkin-Komplexe des η5-Cyclopentadienylnickel-1-norbornyls

Abstract Cp 2 Ni reacts at −50°C with 1-norLi (1-nor = 1-norbornyl = bicyclo[2.2.1]heptane-1-yl) in THF to give CpNi-1-norbornyl ( 3 ) which is stable up to −30°C. 3 reacts with alkynes to complexes of the type CpNi (1-nor)(η 2 -RCCR) (R = Me ( 5a ), SiMe 3 ( 5b ), Ph ( 5c ), CH 2 OMe ( 5d ), CH 2 NMe 2 ( 5e ), CH 2 OSiMe 3 ( 5f )) which are stable at room temperature. 5f forms when chromatographing on Al 2 O 3 the complex CpNi(1-nor)(HOCH 2 CCCH 2 OH) ( 5g ). In some cases the complexes (CpNi-1- nor) 2 (RCCR) (R = SiMe 3 ( 6b ), Ph ( 6c )) and (CpNi) 2 ,(RCCR) (R = Me ( 7a ), SiMe 3 ( 7b ), Ph ( 7c ), CH 2 NMe 2 , ( 7e ), CH 2 OSiMe 3 , ( 7f ), CH 2 OH ( 7g )) are observed in small concentrations as products of thermal decomposition. The compounds were characterized by analytical and spectroscopic data (MS, 1 H and 13 C NMR).