Often elusive, trisubstituted (Z)-1-alkenyl phosphonates can be prepared by the semihydrogenation of allenyl phosphonates in the presence of Pd complex 1. This reaction, which occurs in high yield with high chemo-, regio-, and stereoselectivity, can be extended to related functionalized allenes and the corresponding Z alkene products (see scheme). R1=H, alkyl, aryl, benzyl; R2,R3=H, alkyl; FG=P(O)(OR)2, P(O)Ph2, SO2Ph, COOEt.
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