Modulation of Spectrokinetic Properties of<i>o</i>-Quinonoid Reactive Intermediates by Electronic Factors: Time-Resolved Laser Flash and Steady-State Photolysis Investigations of Photochromic 6- and 7-Arylchromenes
作者:Jarugu Narasimha Moorthy、Apurba L. Koner、Subhas Samanta、Ankur Roy、Werner M. Nau
DOI:10.1002/chem.200801925
日期:2009.4.20
cleavage to yield colored o‐quinonoid intermediates. A combined analysis of μs–ms (laserflash) and real‐time kinetic data show that the o‐quinonoid intermediates decay faster when the C2‐aryl and C6‐/C7‐aryl rings contain electron‐donating and electron‐accepting groups, respectively. Similarly, the decay occurs slowly for the reversed scenario, while intermediate decay rates are observed when both substituents
Mechanosynthesis of Odd‐Numbered Tetraaryl[
<i>n</i>
]cumulenes
作者:Karen J. Ardila‐Fierro、Carsten Bolm、José G. Hernández
DOI:10.1002/anie.201905670
日期:2019.9.9
A mechanochemical synthesis of one‐dimensional carbon allotrope carbyne model compounds, namely tetraaryl[n]cumulenes (n=3, 5) was realized. Central for the mechanosynthesis of the cumulenic carbon nanostructures were the development of a mechanochemical Favorskii alkynylation‐type reaction and the implementation of a solvent‐free, acid‐free reductive elimination with tin(II) chloride by ball milling
实现了一维碳同素异形体碳炔模型化合物,即四芳基[ n ]累积烯(n =3, 5)的机械化学合成。积碳碳纳米结构机械合成的核心是机械化学 Favorskii 炔基化反应的发展,以及通过球磨实现无溶剂、无酸的氯化锡 (II) 还原消除。
Preparation of Spiro[indene-1,1′-isoindolin]-3′-ones via Sulfuric Acid-Promoted Cascade Cyclization
作者:Lang Sun、Peng Liu、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/acs.joc.7b00958
日期:2017.8.18
The sulfuric acid-promoted cascade cyclization of 2-(3-hydroxyprop-1-ynyl)benzonitriles led to an efficient synthesis of spiro[indene-1,1′-isoindolin]-3′-ones. This class of spiro compounds could also be prepared by the sulfuric acid-catalyzed cyclization of 2-(phenylacryloyl)benzonitriles, which were readily derived from 2-(3-hydroxyprop-1-ynyl)benzamides using trifluoroacetic acid as a catalyst.
Brønsted-acid-catalyzed allylic substitution reactions of the in situ generated 3-hydroxy indanones with alcohols and sulfamides were investigated, which provided a facile route for the synthesis of a large variety of 3-alkoxy and 3-sulfamido indanones. The key intermediates, 3-hydroxy indanones, were obtained through the intramolecular Meyer–Schuster rearrangement of o-propargyl alcohol benzaldehydes. The resulting