Formation and reactions of the CH2Li-derivatives of (Bu2P)-Bu-t-P=P(CH3)Bu-t(2) and (Me3Si)(BuP)-Bu-t-P=P(CH3)Bu-t(2)

With (BuLi)-Bu-n, (Me(3)si)(BuP)-Bu-t-P=P(CH3)Bu-t(2) (1) and (Bu2P)-Bu-t-P =P(CH3)Bu-t(2) (2) yield (Me3Si)(BuP)-Bu-t-P=P(CH2Li)(t-) Bu-2 (3) and (Bu2 P)-Bu-t-P=P(CH2Li)Bu-t(2) (4), wich react with Me3SiCl to give (Me3Si)(BuP) -Bu-t-P=P(CH2-SiMe3)Bu-t(2) (5) and (Bu2P)-Bu-t-P=P(CH2-SiMe3)Bu-t(2) (6), respectively. With (Bu2P)-Bu-t-P(SiMe3)-(PBuCl)-Bu-t (7), compound 3 forms 5 as well as the cyclic products [H2C-P(Bu-t)(2)=P-P(Bu-t)-(PBu)-Bu-t] (8) and [H2C-P(Bu-t)(2)=P-P((PBu2)-Bu-t)-P(Bu-t)] (9). Also 3 forms 8 with (BuP Cl2)-Bu-t. The cleavage of the Me3Si-P-bond in 1 by means of C2Cl6 or N-bro mo-succinimide yields (Cl)(BuP)-Bu-t-P=P(CH3)Bu-t(2) (10) or (Br)(BuP)-Bu-t -P=P(CH3)Bu-t(2) (11), resp. With LiP(SiMe3)(2), 10 forms (Me3Si)(2)P-P(Bu- t)-P=P(CH3)Bu-t(2) (12), and Et2P-P(Bu-t)-P=P(CH3)Bu-t(2) (13) with LiPEt2. All compounds are characterized by P-31 NMR Data and mass spectra; the yli de 5 and the THF adduct of 4 additionally by X-ray structure analyses.