Copper(I)-Catalyzed Synthesis of Azoles. DFT Study Predicts Unprecedented Reactivity and Intermediates
摘要:
Huisgen's 1,3-dipolar cycloadditions become nonconcerted when copper(l) acetylides react with azides and nitrile oxides, providing ready access to 1,4-disubstituted 1,2,3-triazoles and 3,4-disubstituted isoxazoles, respectively. The process is highly reliable and exhibits an unusually wide scope with respect to both components. Computational studies revealed a stepwise mechanism involving unprecedented metallacycle intermediates, which appear to be common for a variety of dipoles.
sequential reaction of [RuCl(μ-Cl)(η6-p-cymene)]2 with sodium salicylate and PPh3 gave [Ru(κ2O,O′-salCO2)(PPh3)(η6-p-cymene)], 5, in 70% yield. The hydride complex [Ru2Cl2(μ-Cl)(μ-H)(η6-p-cymene)2], 6, was produced in 36% yield from [RuCl(μ-Cl)(η6-p-cymene)]2 and sodium formate. An optimization of the experimental work-up allowed to isolate [RuCl(μ-Cl)(η6-p-cymene)]2 with an improved yield respect to the
将[RuCl(μ-Cl)的(η的反应6 - p -cymene)] 2与羧酸钠,在甲醇或乙腈溶液,得到复合物将[RuCl(κ 2 ö -RCO 2)(η 6 - p -cymene )](RCO 2 =丙戊酸盐,1;阿司匹林,2;双氯芬酸,3),收率79-96%。类似地,将[RuCl(κ 2 ö -dfCO 2)(η 6 -苯)],4,在混合副产物将[RuCl(μ-Cl)的(η获得具有轻微的6 -苯)] 2和双氯芬酸钠/银。将[RuCl(μ-Cl)的(η的连续反应6 - p -cymene)] 2与水杨酸钠和PPH 3得到的[Ru(κ 2 ö,O' -salCO 2)(PPH 3)(η 6 - p -cymene)],5,收率70%。的氢化物络合物的[Ru 2氯2(μ-Cl)的(μ-H)(η 6 - p -cymene)2 ],6,在从产率将[RuCl(μ-Cl)的(η36%制备6 - p
Synthesis of Polyalkylphenyl Prop-2-ynoates and Their Flash Vacuum Pyrolysis to Polyalkylcyclohepta[b]furan-2(2H)-ones
A new method for the smooth and highly efficient preparation of polyalkylated aryl propiolates has been developed. It is based on the formation of the corresponding aryl carbonochloridates (cf. Scheme 1 and Table 1) that react with sodium (or lithium) propiolate in THF at 25 – 65°, with intermediate generation of the mixed anhydrides of the arylcarbonic acids and prop-2-ynoic acid, which then decompose
Dependence of the Chemical Properties of Macrocyclic [Ni<sup>II</sup><sub>2</sub>L(μ-O<sub>2</sub>CR)]<sup>+</sup>Complexes on the Basicity of the Carboxylato Coligands (L<sup>2−</sup>= macrocyclic N<sub>6</sub>S<sub>2</sub>ligand)
作者:Ulrike Lehmann、Julia Klingele、Vasile Lozan、Gunther Steinfeld、Marco H. Klingele、Steffen Käss、Axel Rodenstein、Berthold Kersting
DOI:10.1021/ic101574a
日期:2010.12.6
carboxylates. The resulting carboxylato complexes, isolated as ClO4− or BPh4− salts, have been fully characterized by elemental analyses, IR, UV/vis spectroscopy, and X-ray crystallography. The possibility of accessing the [NiII2L(μ-O2CR)]+ complexes by carboxylate exchangereactions has also been examined. The main findings are as follows: (i) Substitution reactions between 1 and NaO2CR are not affected
Aktivierung von acetylendicarbonsäure durch überführung in gemischte anhydride [1]
作者:G. Maier、W.A. Jung
DOI:10.1016/0040-4039(80)80204-8
日期:1980.1
Mixed anhydrides from acetylenedicarboxylic acid and differently substituted acetic acids, accessible either by an unusual photoarrangement of type 1 → 4 or by conventional means, are ideal candidates for Diels-Alder reactions.
Crosslinked Internal Alkyne-Based Stereo Elastomers: Polymers with Tunable Mechanical Properties
作者:Yen-Hao Hsu、Andrew P. Dove、Matthew L. Becker
DOI:10.1021/acs.macromol.1c00246
日期:2021.5.25
and control polymer network crosslinking and improve mechanical properties of the resulting materials have been investigated extensively. Common methods to enhance the mechanical properties of elastomers include “vulcanization” by which polymer chains are covalently crosslinked. In this work, we outline a new method to crosslink well-defined, synthetic elastomers using “click” reactions. Specifically