“…Representative recent examples, shown in Scheme 5, include the phosphinoferrocene nitriles 10 73 and 11 , 74 isocyanide 12 , 75 homologous alcohols 13 76 and 14 77 and their corresponding ethers 15 78 and 16 , 79 “acyl” derivatives 17 , 77,80 18 81 and 19 , 82 phosphino-amines 20 , 75,83 21 84 and 22 , 80 a ,85 P-protected phosphino-alkynes ( 23 and 24 86 ) and an azide 25 . 75 Departing from this series are the ambiphilic phosphine-boranes 26 , 87 27 88 and 28 , 89 and polar ferrocene phosphines bearing sulfonate ( 29 90 ), phosphonic acid ( 30 , 91 31 , 92 and 32 93 ) or guaninidium substituents ( 33 94 ).…”