O-Phenylisourea Synthesis and Deprotonation: Carbodiimide Elimination Precludes the Reported Chapman Rearrangement
作者:Joseph A. Tate、George Hodges、Guy C. Lloyd-Jones
DOI:10.1002/ejoc.201600386
日期:2016.6
The kinetics of the addition of phenol to diisopropylcarbodiimide, and reaction of the resulting N,N′-diisopropyl-O-phenylisourea with hydroxide, are reported. The isourea is generated by a slow overall termolecular equilibrium process, inhibited by isourea–phenol salt generation. In contrast to an earlier report, reaction of the isourea with hydroxide does not induce a synthetically useful 1,3-O–N
A binuclear aluminium complex as a single competent catalyst for efficient synthesis of urea, biuret, isourea, isothiourea, phosphorylguanidine, and quinazolinones
作者:Kulsum Bano、Jyoti Sharma、Archana Jain、Hayato Tsurugi、Tarun K. Panda
DOI:10.1039/d2ra07714k
日期:——
the addition of simple nucleophiles to heterocumulenes, leading to the synthesis of a variety of products such as urea, biuret, isourea, isothiourea, phosphorylguanidine, and quinazolinone derivatives, in contrast to its mononuclear analogues. Complex 3a is the first example of a single competent catalyst, which is also low-cost and eco-friendly and derived from a main-group metal, under solvent-free
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