Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Nickel and palladium catalysts effect the chemoselective and stereo-controlled umpolung of aryl and vinyl halides to trimethylsilyl derivatives; this reaction permits a regioselective approach to cyclophanes. ... Prepared as a standardized solution in pentane 4 . Its NMR spectra ...