in toluene under N2; soln. of calixarene, PPh3 and Ni complex (molar ratio 1:3.6:2.4) in toluene stirred at room temp. for 15 h; concd.; crystd. by slow diffusion of hexane; supernatant removed; crystals washed with hexane; dried under vac.; sepd. mechanically; elem. anal.;