1: N,N-dimethylmethylacetylene With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.5 h; 2: chloro-diphenylphosphine in tetrahydrofuran; hexane T=20°C; 1 h;

in hexane The complex and a slight excess of Pp is refluxed in hexane for 5 min (N2). 3percent decompn.; The reaction soln. was filtered and concd. to small vol. under reduced pressure then subjected to preparative thin layer chromy. (silica gel; light petroleum/diethyl ether).;

n-butyllithium 1) ether, hexane, RT, 2 h, 2) ether, RT; Yield given. Multistep reaction;

n-butyllithium 1) THF, -60 deg C, 1 h; Yield given. Multistep reaction;