methyllithium in diethyl ether addn. of 3,3-dimethylbut-1-yne in (C2H5)2O to CH3Li in dry (C2H5)2O under N2 (0°C), warming (room temp.), addn. to a suspn. of AuCl(SMe2) in (C2H5)2O (-78°C), warming (room temp.), stirring (1 h), addn. of a satd. NH4Cl-soln. (0°C); sepn. of the organic layer;

in dichloromethane dropwise addn. of a soln. of trans-(PtCl2(SMe2)2) in CH2Cl2 to a stirred suspn. of 3 equiv of (AuCC-t-Bu) in CH2Cl2, removing of volatile compds. of the mixt. (reduced pressure, after 3 h); drying (vac.);