Chemistry of a geminal frustrated Lewis pair featuring electron withdrawing C6F5 substituents at both phosphorus and boron

Hydroboration of the electron poor phosphine (1-propenyl)P(C6F5)(2) with Piers' borane [HB(C6F5)(2)] gave the geminal frustrated Lewis pair (C6F5)(2)P-CH(Et)-B(C6F5)(2). It undergoes 1,2-addition reactions to an alkene and an alkyne and to the C=N bond of an isocyanate. With mesityl azide it undergoes a 1,3-addition reaction.