New tetrylenes based on substituted diethylenetriamines: synthesis and use as initiators for ε-caprolactone polymerizationстатья
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Дата последнего поиска статьи во внешних источниках: 16 сентября 2020 г.
Аннотация:The reactions of 3-benzyl-1,5-ditosyl-1,3,5-triazapentane (1) and 3-benzyl-1,5-dimesityl-1,3,5-triazapentane (2) with one equivalent of Lappert's germylene or stannylene (M[N(SiMe3)(2)](2), where M = Ge, Sn) produced germylenes and stannylenes of the general formula PhCH2N(CH2CH2NR)(2)M, where M = Ge, R = 4-MeC6H4SO2- (3); 2,4,6-Me3C6H2- (5); M = Sn, R = 4-MeC6H4SO2- (4); 2,4,6-Me3C6H2- (6), in satisfactory yields. According to NMR data (H-1, C-13, Sn-119), stannylenes 4 and 6 are monomeric in solution, and the coordination number of tin is four. The synthesized stannylenes exhibited very high (compound 4) and moderate (compound 6) activity as initiators for bulk polymerization of epsilon-caprolactone, resulting in the synthesis of high-molecular-weight polymers with relatively narrow molecular-weight distribution. Previously unknown triamine 2 was synthesized by benzylation of HN(CH(2)CH(2)NHMes)(2) with benzyl chloride in the presence of K2CO3.