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Modeling the catalyst resting state in aryl tin(iv) polymerizations of lactide and estimating the relative rates of transamidation, transesterification and chain transferElectronic supplementary information (ESI) available: kinetic data of reactions C and E in Scheme 2. See http://www.rsc.org/suppdata/nj/b3/b306700a/
作者:Malcolm H. Chisholm、Ewan E. Delbridge、Judith C. Gallucci
DOI:10.1039/b306700a
日期:——
cyclic lactide oligomers (LA/2)n by intrachain transesterification, in contrast to polymerizations employing Ph2Sn(OPri)2, which produce long chains of H–(LA/2)n–OPri where LA=[OCHMeC(O)OCHMeC(O)]. The kinetics of the reactions between Ph3SnX and each of Me2CHC(O)OMe, Me(MeO)CHC(O)OEt and Ph3SnOCHMeC(O)OEt, have been determined from NMR studies in benzene-d6 where X=NMe2 or OPri. Similarly, the reaction
制备和表征(红外,1 H,13 C 1 H},119 Sn NMR光谱, 元素分析 和单晶 X射线结构测定)报道了Ph 3 SnOCMe 2 C(O)OEt(1)和Ph 2 Sn [OCMe 2 C(O)NMe 2 ] 2(2)。在固态状态下,化合物1包含四坐标锡,并有证据表明该化合物形成了初始键。酯氧气:Sn⋯O = 2.648(2)Å。化合物2包含伪八面体几何形状的六坐标锡。OCMe 2 C(O)NMe 2基团形成短的顺式螯合物。2.03Å,长,约。2.26Å,Sn–O键与醇盐和酰胺氧原子。在溶液中,化合物1保持四坐标,但化合物2以六坐标和五坐标物质的平衡混合物形式存在,根据核磁共振波谱。在甲苯-d 8中的-50 °C下,六配位异构体受到青睐,NMR数据与在固态下观察到的结构一致。在50 ℃时,NMR数据是具有五配位物质一致,其中的η可逆螯合2 -和η 1 -OCMe 2 C(O)NME
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Nietzschmann, Eckhart; Kellner, Kurt, Phosphorus, Sulfur and Silicon and the Related Elements
作者:Nietzschmann, Eckhart、Kellner, Kurt
DOI:——
日期:——
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Visalakshi, R.; Jain, V. K.; Rao, G. S., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1988, vol. 27, # 5, p. 427 - 429
作者:Visalakshi, R.、Jain, V. K.、Rao, G. S.
DOI:——
日期:——
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Ahmad, Rafi; Srivastava, G.; Mehrotra, R. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1983, vol. 22, # 1, p. 32 - 34
作者:Ahmad, Rafi、Srivastava, G.、Mehrotra, R. C.
DOI:——
日期:——
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NIETZSCHMANN, ECKHART;KELLNER, KURT, PHOSPH., SULFUR AND SILICON AND RELAT. ELEM., 55,(1991) N-4, C. 73-77
作者:NIETZSCHMANN, ECKHART、KELLNER, KURT
DOI:——
日期:——