TE-125, C-13 AND H-1-NMR CHARACTERIZATION OF A SERIES OF DIORGANOTELLURIUM(II) AND TETRAORGANOTELLURIUM(IV) COMPOUNDS
TE-125, C-13 AND H-1-NMR CHARACTERIZATION OF A SERIES OF DIORGANOTELLURIUM(II) AND TETRAORGANOTELLURIUM(IV) COMPOUNDS
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DOI：
10.1002/mrc.1260330606
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发表时间：
1995-06-01
影响因子：
2
通讯作者：
NISSAN, RA
中科院分区：
文献类型：
--
作者：
GEDRIDGE, RW;HIGA, KT;NISSAN, RA
对一系列对称二有机碲（II）[R（2）Te，其中R = Me，Et，n-Bu，CH（2）SiMe（3），烯丙基，乙烯基，C=CMe，C=CEt，C=C（n-Pr），C =C（t-Bu），C =C（SiMe（3））和C=CPh]，非对称二有机碲（II）（RTeR '）（其中R =烯丙基，R' = Me，Et，i-Pr，t-Bu; R = Me和R' =苄基），对称的双（烷基碲基）乙炔（RTeC=CTeR，其中R = Me和Et）和对称的四有机碲（IV）（R（4）Te，其中R = Me，n-Bu，CH（2）SiMe（3）和乙烯基）化合物。Te-125在H-1去偶和H-1偶联条件下获得。而H-1-去耦的Te-125 NMR光谱是非常有用的，在确定低水平的碲含杂质，H-1耦合的Te-125实验允许的结构测定和识别的长期和短期的耦合途径。使用H-1和C-13 NMR来评估有机材料的纯度，所述有机材料可包括溶剂、分解副产物和来自合成期间发生的副反应的不需要的有机金属化合物。Te-125卫星在H-1和C-13 NMR谱中被观察到，并且在共振分配和识别长距离和短距离耦合途径中是有用的。讨论了取代基对化学位移和偶合常数的影响。
Te-125, C-13 and H-1 NMR studies on a series of symmetric diorganotellurium(II) [R(2)Te, where R = Me, Et, n-Bu, CH(2)SiMe(3), allyl, vinyl, C=CMe, C=CEt, C=C(n-Pr), C=C(t-Bu), C=C(SiMe(3)) and C=CPh], unsymmetric diorganotellurium(II) (RTeR') (where R = allyl, R' = Me, Et, i-Pr, t-Bu; R = Me and R' = benzyl), symmetric bis(alkyltelluro)ethyne (RTeC=CTeR, where R = Me and Et) and symmetric tetraorganotellurium(IV) (R(4)Te, where R = Me, n-Bu, CH(2)SiMe(3) and vinyl) compounds are presented. Te-125 was acquired under H-1-decoupled and H-1-coupled conditions. Whereas the H-1-decoupled Te-125 NMR spectra are extremely useful in identifying low levels of tellurium containing impurities, the H-1-coupled Te-125 experiments allow for structure determination and identification of long- and short-range coupling pathways. H-1 and C-13 NMR were used to assess purity in terms of organic materials which can include solvents, decomposition byproducts and unwanted organometallic compounds from side reactions occurring during synthesis. Te-125 satellites are observed in the H-1 and C-13 NMR spectra and are useful in resonance assignments and in identification of long- and short-range coupling pathways. The effects of substituents on chemical shifts and coupling constants are discussed.