paraformaldehyde in toluene byproducts: CO, H2, C2H4; N2-atmosphere; stirring (1 d);

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in benzene byproducts: CH3CH2OCOCH2CH2COOCH2CH3, CH3CH2COOCH2CH3; Ar; 5 h reflux;; separation of the polymer product; filtration; washing with benzene; drying in vacuo; elem. anal.; the dicarbonyl complex and the monocarbonyl complex were isolated from the filtrate;;

in tetrahydrofuran byproducts: C2H4; all manipulations under Ar; slow addn. of the acetylene derivative to a soln. of (PPh3)2Ni(C2H4) at room temp., stirring at 25°C for 0.5 h, heating at 40-50°C until the evolution of gas stopped; filtration, addn. of n-hexane, crystn. on cooling to -40°C or -78°C for 2-5 d), the ppt. was filtered off, washed with cold n-hexane twice, and dried under vac.; elem. anal.;

in not given introduction of N2 in presence of excess P(C6H5)3)3;;

in benzene addn. of the cyclopropane in benzene to the Ni compd. in benzene and keeping at 22°C for 24 h (Ar), addn. of ether, ppt. (allyl complex) is filtered off, washed (ether) and dried (vac.); concn., evapn. of the mother liquors and washings, treating with ether, filtn., washing with ether and drying (vac.) yields Ni(PPh3)3; elem. anal.;

in benzene byproducts: CH2CH2; evapn. of CH2CH2 in vac.;;

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-40°C;; not isolated;