合成了许多带有3-苯基丙基取代基(1a-1h)的苯并咪唑盐,并通过1 H NMR,13 C NMR,IR光谱法和元素分析鉴定了它们的结构。这些N-杂环卡宾(NHC)前体在微波辐射下被用作Sduki-Miyaura交叉偶联反应中包括Pd(OAc)2和碱的催化体系的一部分。它们还用作异氰酸苯酯的环三聚反应的催化剂,得到1,3,5-三苯基-1,3,5-三嗪烷-2,4,6-三酮。已经观察到,苯并咪唑盐作为NHC前体对两种催化反应均具有积极作用。
1,4,2-Diazaphospholidine-3,5-diones and Related Compounds: A Lecture on Unpredictability in Catalysis
作者:Frank U. Richter
DOI:10.1002/chem.200900039
日期:2009.5.18
Whereas 1‐organyl‐phospholanes and 1‐organyl‐2,3‐dihydro‐1H‐phospholes catalyze isocyanate oligomerization, the reaction of isocyanates with 1‐organyl‐2,5‐dihydro‐1H‐phospholes results in the formation of 1,3‐dienes and a novel class of P‐heterocycles, 1,4,2‐diazaphospholidine‐3,5‐diones. Isothiocyanates and carbodiimides exhibit analogous behavior. The resultant species readily form P‐oxides, P‐sulfides
Synergistic Catalysis by Brønsted Acid/Carbodicarbene Mimicking Frustrated Lewis Pair‐Like Reactivity
作者:Yi‐Chen Chan、Yuna Bai、Wen‐Ching Chen、Hsing‐Yin Chen、Chen‐Yu Li、Ying‐Yann Wu、Mei‐Chun Tseng、Glenn P. A. Yap、Lili Zhao、Hsuan‐Ying Chen、Tiow‐Gan Ong
DOI:10.1002/anie.202107127
日期:2021.9
Carbodicarbene (CDC), unique carbenic entities bearing two lone pairs of electrons are well-known for their strong Lewis basicity. We demonstrate herein, upon introducing a weak Brønstedacid benzyl alcohol (BnOH) as a co-modulator, CDC is remolded into a Frustrated Lewis Pair (FLP)-like reactivity. DFT calculation and experimental evidence show BnOH loosely interacting with the binding pocket of CDC
Chloroboration and allied reactions of unsaturated compounds. Part VIII. Insertion of isocyanates and isothiocyanates into Al–Et and Al–Br bonds
作者:J. R. Horder、M. F. Lappert
DOI:10.1039/j19680002004
日期:——
co-ordination compounds (formulated as RNC[graphic omitted]–l[graphic omitted]Br3, and characterised by an abnormally-high NCO asymmetric stretching frequency at ca. 2400 cm.–1) were identified as the first-formed products. The insertioncompounds were dimeric in solution and are assigned an eight-membered ring structure. Exceptions are Br2AlN(Ph)C(:Q)Br (Q = O or S), which are monomeric, and are believed
The introduction of nitrile-groups into heterocycles and conversion of carboxylic groups into their corresponding nitriles with chlorosulfonylisocyanate and triethylamine
作者:Helmut Vorbrüggen、Konrad Krolikiewicz
DOI:10.1016/s0040-4020(01)89685-x
日期:——
Addition of chlorosulfonylisocyanate (CSI) to heterocycles such as thiophene (4) or indole (15) and unsaturated systems such as dihydropyran (7) gives N-chlorosulfonylamides RCONHSO2Cl, which can be converted by equivalent amounts of triethylamine to their corresponding nitriles. Since carboxylic acids react with CSI to N-chlorosulfonylamides, subsequent treatment with triethylamine affords the corresponding
The trimerization of phenyl isocyanate in the presence of triethylamine was accelerated under high pressure to give triphenyl isocyanurate almost quantitatively. The reaction in benzene was remarkably accelerated by compression. The effects of pressure, temperature, catalysts, and solvents were examined on the trimerization of phenyl isocyanate. Aryl and normal alkyl isocyanatestrimerized under high