C-lithiated bis(tert-butyl-methyl)ketazine reacts with halosilanes to give the monosilylketazines, t-Bu(Me)C=N-N=C(t-Bu)-CH2R, (1 - 7). (1: R = SiMe3; 2: R = SiClMe2; 3: R = SiClMePh; 4: R = Cl2SiPh; 5: R = SiCl3; 6: R = SiMe2Ph; 7: R = F2SiN(t-Bu)SiMe3). The bis(ketazinyl)silanes [t-Bu(RCH2) C = N-N = CCH2-t-Bu]2 SiMe2 8, 9 are formed in the reaction of the same lithiated ketazine or 1 with Cl2SiMe2 in a molar ratio of 2 : 1, (8: R = H; 9: R = SiMe3). Di(silyl)ketazines (10, 11) are obtained from lithiated 1 and ClSiMe2Ph in a molar ratio of 1:1 and from dilithiated ketazine with F2Si(i-Pr)2 in a molar ratio of 1 : 2 [t-Bu(RH2C)C=N-N=C(CH2R’)t-Bu, 10: R = SiMe3, R’ = SiMe2Ph; 11: R,R’ = FSi(i-Pr)2]. The tris(ketazinyl)fluorosilane 12 is isolated from the reaction of SiF4 with the lithiated ketazine. 2-Alkenyl-1,2-diaza-3-sila-5-cyclopentenes, t-Bu(CH2)C- [N-SiR,R’-CH2-C(t-Bu)=N], (14 - 17) are obtained from the dilithiated ketazine and Hal2SiRR’. (14: Hal = Cl, R = Me, R’ = Ph; 15: Hal = F,R = t-Bu, R’ = Ph; 16: Hal = F,R = t-Bu, R’ = F; 17: Hal = F, R = N(t-Bu)SiMe3, R’ = F). X-ray structure analyses are presented for 7, 11, and 17.
The dilithium salt of di(tert-butyl-methyl)ketazine 1 reacts with the bimolar amount of ClSiMe3 to give the di(tert-butyl-trimethylsilylmethylen)ketazine, 2. In the reaction of lithiated 2 and F2PN(iPr)2 the 1,2-diaza-3-phosphacyclopent-5-ene (3) is formed. The dichlorophosphanes Cl2PC6H5 and Cl2PCMe3 react with 1 in boiling toluene to give the 1,2-diaza-3-phosphacyclopentenes 4 and 5. The oxygen of the air oxidizes 5 to the 1,2-diaza-3-phosphacyclopent-5-ene 6. Equivalent amounts of H2O cleave the ring skeleton of 5, the tert-butyl-methyl-(tert-butyl-(tert-butylphosphino)methylketazine 7 being formed. The 1,2-diaza-3-phosphacyclopenta-3,5-diene 8 and the 1,5-diaza-2,6-diphospha- bicyclo[3.3.0]octa-3,7-diene 9 are the reaction products of 1 and PCl3 in toluene. 1 forms with HCl the hydrochloride 10. The 5-tert-butyl-1,2-diaza-3-phospha-cyclopenta-3,5-diene 11 is isolated from the reaction of 9 and MeLi. 11 is also obtained from PCl3 and tert-butyl-methyl-hydrazone in good yields. The cyclohexaphosphane 12 was formed in the reaction of 9 with Na/K alloy. The results of the crystal structure analyses of 2, 3, 6, 10, and 12 are reported.