( Ph ) ] ( Cl )

The reaction o f Cp'2ZrCl2 (1) (Cp' = C 5H 4M e) with L i(T H F )2P (SiM e3)2 yields the zirconoocene m onophosphido com plex Cp'2Z r(Cl){P(SiM e3)2} (2) in good yield. 2 reacts with diphenyl­ carbodiim ide with insertion o f the heterocum ulene into the Z r P bond to give Cp'22 r[N (P h )C {P (S iM e3)2}N (Ph)](C l) (3). 2 and 3 were characterized spectroscopically (IR, N M R ), and an X-ray structure determ ination was carried out on 1 and 3 (crystal data: 1, a = 6.803(3), b = 12.008(6), c = 15.480(12) Ä , space group P nm a (N o . 62), Z = 4, 1685 observed independent reflexions, R = 5.4% , 3, a = 9.210(7), b = 11.491(13), c = 31.279(15) Ä , ß = 95.32(4)°, space group P 2 xjn (N o. 14), Z = 4, 6408 observed independent reflexions, R = 6.2% ). The crystal structure o f 3 revealed //2-bonding (N ,N ') o f the phosphaguanidene ligand N (P h )C {P (S iM e3)2}N (P h )e to the Zr atom ( Z r N l 2.309(5) Ä , Z r N 2 2.348(5) Ä). The li­ gand can not be obtained from the reaction o f L i(T H F)2P (SiM e3)? with diphenylcarbodiim ide, which instead affords L i(T H F )N P h C {N (S iM e3)P h }P C {N (S iM e3)P h}N P h.