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By applying the method of inverse titration [1,2] the influence of increasing concentrations of added effectors to organic and metalorganic chemical systems on the product selectivity can easily be identified. o a Wittig-type system we added LiI (change of stereoselectivity) and also triphenylphosphanoxide (removal of salt-effect). To a catalytic N (0) /butadiene system we added triphenylphosphite and then morpholine and vice versa. Ni:P(OC 6 H 5 ) 3 : morpholine in a ratio 1:1:0,1 yields more than 90% cyclodimers but in a ratio 1:0,1:20 more than 90% n-octa-1,3,6- trienes. The co-oligomerisation of two butadienes with one 2,5-dimethyl-3-aza-hex-3-en in the system Ni/triphenylphosphane/butadiene/Schiff base/toluene/effector (1:1:66:33:66: ~ 0,1) leads - within the 2 : 1-cooligomers - by adding di-n-propyl-borane to a pure octadienylated Schiff base 11 or by adding morpholine largely to an octatrienylated amine 12 ( ~ 85% 12 and  ~ 15% 11).

zeitschrift für naturforschung b

Änderung der Selektivität in katalytischen Mehrkomponenten-Systemen über die Konzentrationen, Steuerung metallkatalysierter Reaktionen, XIII. Mitteilung [1]