钒氧基和亚氨基配合物:V(NC 6 H 4 Me)(O t Bu)3(1),V(NC 6 H 4 Me)Cl 3(2),V(O)(O t Bu)3(3),V(O)(O i Pr)3(4),V(O)(acac)2(5)是对称碳二亚胺(RNCNR,其中R =环己基,异丙基和对甲苯基)复分解的催化剂)。在138℃下,在p二甲苯使用络合物5摩尔%1 - 5中,上述碳二亚胺的复分解,以非对称的碳二亚胺:Ñ -环己基,Ñ ' - p -tolylcarbodiimide(6),Ñ -异丙基,Ñ ' - p -tolylcarbodiimide(7),Ñ -环己基,Ñ '-isopropylcarbodiimide(8) 。取决于所使用的催化剂,在数分钟至数小时内达到碳二亚胺的平衡混合物。从气相色谱获得的产率为32%至70%。络合物2是最有效的催化剂,其周转频率大于100 h -1。羰基配合物(3– 5
Half-sandwich rare-earth metal tris(alkyl) ate complexes catalyzed phosphaguanylation reaction of phosphines with carbodiimides: an efficient synthesis of phosphaguanidines
作者:Wangyang Ma、Ling Xu、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1039/c5nj01136a
日期:——
Half-sandwich Y/Li ate complex displays better catalytic activity for phosphaguanylation reaction of phosphines with carbodiimides than the neutral yttrium complexes.
A Catalytic Route to Pyrrole Derivatives
<i>via</i>
Copper‐catalyzed Multicomponent Reaction
作者:Alireza Samzadeh‐Kermani、Samira Ghasemi
DOI:10.1002/jhet.3614
日期:2019.8
A novelapproach for the synthesis of pyrrole derivatives has been reported. The reactions starting from terminal alkynes, carbodiimides, and malononitrile using CuI, DBU, and TBPAc in anhydrous MeCN afforded the functionalized pyrroles in acceptable yields. Alkyl‐, aryl‐, and heteroaromatic terminal alkynes were tolerated. Carbodiimides could be symmetrical and unsymmetrical substrates with aryl or
Electrochemical Synthesis of Carbodiimides via Metal/Oxidant-Free Oxidative Cross-Coupling of Amines and Isocyanides
作者:Bhanwar Kumar Malviya、Pradeep K. Jaiswal、Ved Prakash Verma、Satpal Singh Badsara、Siddharth Sharma
DOI:10.1021/acs.orglett.0c00510
日期:2020.3.20
This work discloses an electrochemical oxidative cross-coupling of amines with aryl and aliphatic isocyanides. In an undivided cell, the reaction proceeds without involving any transition-metal catalyst, oxidant, or toxic reagents providing carbodiimides in good yields, thereby circumventing stoichiometric chemical oxidants, with H2 as the only byproduct. Moreover, carbodiimides were in situ converted
AbstractA facile and efficient sonochemical method for the preparation of carbodiimides from their corresponding thioureas or ureas was described. Using Ph3P–I2 combination in the presence of triethylamine, various diaryl, aryl–alkyl, as well as dialkyl substituted substrates could be converted into carbodiimides in good-to-excellent yields within short reaction times under mild conditions with simple