presence of catalytic amounts of Ni(acac)2 (5–10 mmol %) leading to arylzinc derivatives 1. The reaction can be extended to the preparation of alkylzinc compounds and allows a stereoselective cyclization to a 2,4-disubstituted tetrahydrofuran by a radical ring closure of an unsaturated telluride.
Novel Water-Soluble Diorganyl Tellurides with Thiol Peroxidase and Antioxidant Activity
作者:Takahiro Kanda、Lars Engman、Ian A. Cotgreave、Garth Powis
DOI:10.1021/jo990842k
日期:1999.10.1
at pH = 7.4 by using the coupled GSSG reductase assay. Dialkyl telluride 10 turned out to be the most efficient catalyst. Several alkylaryl tellurides 8 were also more efficient than any of the previously tested organotellurium compounds in this model. Bulky and electron-withdrawing aryl substituents seemed to reduce activity, whereas electron-donating groups enhanced it. Alkylaryl selenide 9 was
of nano-Fe3O4@GO over pristine nano-Fe3O4 is established. The formation of C–Se and C–Te bonds is of synthetic and biological importance. Graphene oxide based nano-Fe3O4 (nano-Fe3O4@GO) is used as a reusable catalyst for the efficient synthesis of diselenides and ditellurides, through crosscoupling of Se(0) or Te(0) with aryl iodides. The magnetic heterogeneous catalyst could be easily recovered and
摘要 C-Se和C-Te键的形成具有合成和生物学重要性。通过Se(0)或Te(0)与芳基碘化物的交叉偶联,基于氧化石墨烯的纳米Fe 3 O 4(nano-Fe 3 O 4 @GO)可作为可重复使用的催化剂,用于高效合成二硒化物和二碲化物。 。磁性多相催化剂可以容易地回收和重复使用多次,而不会显着降低催化活性。此外纳米Fe的优越性3 ö 4 @GO超过原始纳米的Fe 3 ö 4成立。 C-Se和C-Te键的形成具有合成和生物学重要性。通过Se(0)或Te(0)与芳基碘化物的交叉偶联,基于氧化石墨烯的纳米Fe 3 O 4(nano-Fe 3 O 4 @GO)可作为可重复使用的催化剂,用于高效合成二硒化物和二碲化物。 。磁性多相催化剂可以容易地回收和重复使用多次,而不会显着降低催化活性。此外纳米Fe的优越性3 ö 4 @GO超过原始纳米的Fe 3 ö 4成立。
Competitive Te-Te and C-Te bond cleavage in the oxidative addition of diaryl and dialkyl ditellurides to Pt(0) centers
作者:Minna M. Karjalainen、Torben Wiegand、J. Mikko Rautiainen、Andreas Wagner、Helmar Görls、Wolfgang Weigand、Raija Oilunkaniemi、Risto S. Laitinen
DOI:10.1016/j.jorganchem.2017.03.004
日期:2017.5
characterizations of 2 and 3. Two series of reactions were carried out both at room temperature and at −80 °C. One involved the addition of the toluene solution of R2Te2 to that of [Pt(η2-nb)(dppn)], and the other the addition of [Pt(η2-nb)(dppn)] solution to the R2Te2 solution. The oxidativeaddition of nBu2Te2 to [Pt(η2-nb)(dppn)] yielded solely [Pt(TenBu)2(dppn)]. In case of Ph2Te2 and Th2Te2, the reaction of
Novel group transfer cyclization reactions of organotellurium compounds
作者:Lars Engman、Vijay Gupta
DOI:10.1039/c39950002515
日期:——
When irradiated in the presence of hexabutylditin, readily available O-allylated and O-prop-2-ynylated 2-hydroxyalkyl aryl tellurides undergo group transfer cyclization to afford 2, 4-disubstituted tetrahydrofuran derivatives.