Highly Active Dinuclear Titanium(IV) Complexes for the Catalytic Formation of a Carbon–Heteroatom Bond
作者:Jayeeta Bhattacharjee、Adimulam Harinath、Indrani Banerjee、Hari Pada Nayek、Tarun K. Panda
DOI:10.1021/acs.inorgchem.8b01766
日期:2018.10.15
The catalytic efficiency of the dinuclear complex depends on the cooperative effect of the TiIV ions, the systematic variation of the intermetallic distance, and the ligand’s steric properties of the complex, which enhances the reaction rate. Most interestingly, this is the first example of catalytic insertion of various E–H bonds into the carbodiimides using a single-site catalyst because only the titanium-mediated
Hydroamination of carbodiimides, isocyanates, and isothiocyanates by a bis(phosphinoselenoic amide) supported titanium(<scp>iv</scp>) complex
作者:Jayeeta Bhattacharjee、Suman Das、Ravi K. Kottalanka、Tarun K. Panda
DOI:10.1039/c6dt03063g
日期:——
isothiocyanates by a bis(phosphinoselenoic amide) supported titanium(IV) complex as a precatalyst is reported here. The titanium(IV) complex [Ph2P(Se)NCH2CH2NPPh2(Se)}Ti(NMe2)2] (1) was synthesised by the reaction of tetrakis-(dimethylamido)titanium(IV) [Ti(NMe2)4] with [Ph2P(Se)NHCH2CH2NHPPh2(Se)}] in toluene at ambient temperature. Titanium complex 1 proved to be a competent pre-catalyst for the addition of
An “on-water” exploration of CuO nanoparticle catalysed synthesis of 2-aminobenzothiazoles
作者:Saroj Kumar Rout、Srimanta Guin、Jayashree Nath、Bhisma K. Patel
DOI:10.1039/c2gc35575b
日期:——
An âon-waterâ one-pot process has been engineered for the preparation of 2-aminobenzothiazole from ortho-halo (âF, âCl, âBr and âI) substituted unsymmetrical thioureas. For ortho âI and âBr substrates the reactions afford 2-aminobenzothiazoles under metal free condition promoted by base. However, the relatively inert ortho âCl and âF substrates undergo intramolecular arylthiolation only in the presence of CuO nanoparticles yielding 2-aminobenzothiazoles. This methodology provides easy access to aminobenzothiazoles utilising even the ortho âCl and âF substrates. The catalyst is recyclable several times without loss of substantial activity. Other remarkable features include the wide range of functional group tolerance, absence of chromatographic purification (for ortho âI and âBr substrates) and providing moderate to excellent yield of the products under mild conditions, thus rendering the methodology as a highly eco-friendly alternative to the existing methods.
conditions, we successfully demonstrated the formation of 30 different guanidine compounds, achieving yields ranging from fair to excellent. Furthermore, the synthesis method could be carried out on a gram scale with a good yield. This protocol stands out for its cost-effectiveness, step-economical design, high tolerance towards various functional groups, and environmentally friendly reaction conditions
Catalytic addition reactions of amines, thiols, and diphenyl‐phosphine oxides to heterocumulenes using a bridging Sulfonylimido titanium(IV) complex
作者:Indrani Banerjee、Shweta Sagar、Christian Lorber、Tarun K. Panda
DOI:10.1002/zaac.202200188
日期:2022.9.27
using a p-tolylsulfonylimide-supported dinuclear titanium complex. All the reactions were achieved in excellent yield under mild conditions and within a short reaction time. The products were isolated and fully characterized by spectroscopic techniques. We also propose a mechanism involving the proton abstraction (of the E−H of anilines or thiophenols) in the first step. In the reaction mechanism, the
我们在此提出了一种有效的加氢元素化反应方法,例如使用对甲苯基磺酰亚胺负载的双核钛配合物对杂枯烯碳二亚胺、芳基异氰酸酯和异硫氰酸酯与苯胺或苯硫酚进行氢胺化、氢硫醇化和氢磷酸化。所有反应均在温和的条件下和较短的反应时间内以优异的收率实现。通过光谱技术分离和充分表征产物。我们还提出了一种在第一步中涉及质子提取(苯胺或苯硫酚的 E-H)的机制。在反应机理中,双核 Ti IV配合物的酰胺基团充当离去基团,而磺酰亚胺键不受影响。