1: With 4-methoxy-phenol; hydrogen tetrakis[3,5-bis(trifluoromethyl)phenyl]borate; (.eta.5-pentamethylcyclopentadienyl)Rh(ethylene)2 in dichloromethane T=0 - 55°C; 2 - 24 h; 2: With hydrogen in dichloromethane T=55°C; P=750.075 Torr; 69 h; Product distribution / selectivity;

lt;(C3H5)Pd(OEt2)(P(n-Bu)3)gt;lt;Blt;3,5-(CF3)2C6H3gt;4gt; T=60°C; 24 h; other electrophilic η3-allyl-palladium(II) complexes, also ethylene dimerization; Mechanism;

tetrafluoroboric acid-diethyl ether complex; [HP(t-Bu)3]BF4; 1-hydrogeno-3-butylimidazolium tetrafluoroborate; bis(acetylacetonato) palladium T=80°C; 1 h; Product distribution; Further Variations:CatalystsReagents;

phosphorus pentachloride

(η5-C5Me5)Rh(C2H4)2 multistep reaction; mechanism of rhodium(III)-catalyzed dimerization;

in chloroform-d1 identified by NMR;