Download 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. ... Tris(pyridyl)phosphines (2- and 3-pyridyl) and 1,2-bis(di-3-pyridylphosphino)ethane were synthesized in 70–75% yield using a Grignard reagent. The product could be efficiently isolated by solid–liquid extraction with diethylamine. ... Encapsulation of transition metal catalyst ...