Stille Cross-Couplings of Unactivated Secondary Alkyl Halides Using Monoorganotin Reagents
摘要:
The first catalyst that achieves Stille cross-couplings of secondary (as well as primary) alkyl halides has been developed. The method employs easily handled and inexpensive catalyst components (NiCl2 and 2,2'-bipyridine) and, through the use of monoorganotin reagents, avoids the formation of toxic and difficult-to-remove triorganotin side products.
Stille Cross-Couplings of Unactivated Secondary Alkyl Halides Using Monoorganotin Reagents
摘要:
The first catalyst that achieves Stille cross-couplings of secondary (as well as primary) alkyl halides has been developed. The method employs easily handled and inexpensive catalyst components (NiCl2 and 2,2'-bipyridine) and, through the use of monoorganotin reagents, avoids the formation of toxic and difficult-to-remove triorganotin side products.
Crown-Tetrathiafulvalenes Attached to a Pyrrole or an EDOT Unit: Synthesis, Electropolymerization and Recognition Properties
作者:Gaëlle Trippé、Franck Le Derf、Joël Lyskawa、Miloud Mazari、Jean Roncali、Alain Gorgues、Eric Levillain、Marc Sallé
DOI:10.1002/chem.200400303
日期:2004.12.17
electroactive receptor has been covalently linked to electropolymerizable pyrrole or 3,4-ethylenedioxythiophene monomers. The synthetic route to the monofonctionalized tetrathiafulvalene (TTF) ligand has been optimized. Two derivatives of pyrrole (N- and 3-substituted) were synthesized. The various substituted monomers have been electropolymerized to produce polypyrrole (PP) and poly(ethylenedioxothiophene) (PEDOT)
Zinc-promoted umpolung thiolation of alkyl electrophiles with masked sulfur transfer reagents in the absence of nickel or copper catalysis is described. This protocol proceeds via a SET process of Zn to electrophilic sulfur reagent followed by insertion of Zn into disulfide and nucleophilic thiolation, providing straightforward access to a wide range of alkyl sulfides with broad substrate scope. A
描述了在没有镍或铜催化的情况下,使用掩蔽硫转移试剂对烷基亲电子试剂进行锌促进的还原硫醇化。该方案通过Zn 与亲电硫试剂的 SET 过程进行,然后将 Zn 插入二硫化物和亲核硫醇化,从而可以直接获得具有广泛底物范围的各种烷基硫醚。合成、分离并通过 NMR、IR 和 X 射线分析充分表征了具有四面体几何形状的中性 TMEDA 连接的四配位硫醇锌。更重要的是,这种活性中间体的化学反应性已经得到研究,能够构建 C-Se、C-Te、Sb-S 和 Bi-S 键,以制备有价值的含硫分子等。
Fraga; Keese, Synlett, 2000, # 11, p. 1694 - 1696
作者:Fraga、Keese
DOI:——
日期:——
AMINE-TERMINATED TELECHELIC POLYMERS AND PRECURSORS THERETO AND METHODS FOR THEIR PREPARATION