By using aldehydes or ketones as the catalyst and screening CsOH out as the more effective base than KOH in many instances, an efficient 9-C-alkylation of fluorenes with alcohols was...
Excited-State Dynamics of Bis(9-fluorenyl)methane and its Derivative 9-(9-Ethylfluorenyl)-9′-fluorenylmethane: Steric Effect on Energetics and Dynamics of Ground- and Excited-State Conformations
作者:Bong Hyun Boo、Minyung Lee、Ki-Seok Jeon、Seung-Joon Kim
DOI:10.1021/jp411878r
日期:2014.3.27
theoretical and experimental results reveal that the substitution effect is also found to appreciably influence the energies, spectroscopy, and kinetics associated with the interconversion of various conformers of the diaryl compounds. We have not observed the rising components in the excimer fluorescence decay of BFM and EFFM in PMMA as observed in the liquid solutions probably because of the existence of
A facile IrIII-catalyzed benzylicalkylation of arenes with alcohols has been accomplished via borrowing hydrogen (BH) pathways, and the newly developed spirocyclic NHC IrIII pincer complex (Cat A) serves as an efficient catalyst for this atom-economical and greener transformation. Some drug or bioactive molecules and functional material templates can be easily constructed by this strategy.
通过借氢 (BH) 途径实现了一种简单的 Ir III催化的芳烃与醇的苄基烷基化,新开发的螺环 NHC Ir III钳形配合物 (Cat A) 可作为这种原子经济和绿色转化的有效催化剂. 一些药物或生物活性分子和功能材料模板可以通过这种策略轻松构建。
Ligand-assisted nickel catalysis enabling sp<sup>3</sup> C–H alkylation of 9<i>H</i>-fluorene with alcohols
作者:Ayanangshu Biswas、Amreen K. Bains、Debashis Adhikari
DOI:10.1039/d2cy00638c
日期:——
Herein we report a nickel-catalyzed sp3 C–H alkylation protocol of 9H-fluorene using cheap and abundant alcohols as the source of alkyl groups. The developed method spans a host of primary, secondary, aliphatic and alicyclic alcohols as the alkylation partner and exhibits chemoselectivity during alkylation. The alkylated products were synthesized in moderate to high yields that can rival those of a
在这里,我们报告了镍催化的 9 H sp 3 C-H 烷基化方案-芴使用廉价和丰富的醇作为烷基来源。所开发的方法涵盖了许多伯醇、仲醇、脂肪醇和脂环醇作为烷基化伙伴,并在烷基化过程中表现出化学选择性。烷基化产物以中等至高产率合成,可与少数其他金属催化工艺相媲美。该烷基化反应中的重要中间体之一是 9-亚烷基芴,它经过加氢得到最终产物。该过程以配体为主并遵循自由基途径,这与所有先前烷基化芴的方法明显不同。为了展示氢储存在配体骨架中,
Gautier,J.A. et al., Bulletin de la Societe Chimique de France, 1965, p. 1740 - 1749