142010-87-5Relevant articles and documents
Synthesis, properties, and structures of functionalized peri -xanthenoxanthene
Lv, Na,Xie, Meilan,Gu, Weibing,Ruan, Huanyang,Qiu, Song,Zhou, Chunshan,Cui, Zheng
, p. 2382 - 2385 (2013)
Three types of alkylated peri-xanthenoxanthene (PXX) have been synthesized employing efficient synthetic routes. These heteroaromatic compounds exhibited different electronic and crystal structures according to UV-vis spectra, electrochemical measurements, and X-ray structural analyses. Among them, 1,7-DOPXX has been demonstrated as an active material for organic field-effect transistors with promising mobility and a high on/off ratio simultaneously.
Synthesis of (±)-3,3′-diphenyl-2,2′-binaphthol via different routes using Pd and Ni as catalyst respectively
Fu, Zhengjiang,Cao, Xihan,Hao, Guangguo,Shi, Quanqing,Cai, Hu
, p. 831 - 836 (2020/09/09)
3,3′-Biphenyl-2,2′-binaphthols (BINOLs) are precursors of phosphoric acids that are widely used as ligands and catalysts in organic reactions. In this report, two routes for the synthesis of (±)-3,3′-diphenyl BINOLs via (±)-3,3′ bis-halogenated BINOLs int
Photocatalyzed E→Z Contra-thermodynamic Isomerization of Vinyl Boronates with Binaphthol
Brégent, Thibaud,Bouillon, Jean-Philippe,Poisson, Thomas
, p. 13966 - 13970 (2021/08/25)
The photocatalytic contra-thermodynamic E→Z isomerization of vinyl boronates by using a binaphthol catalyst is disclosed. The reaction, based on the transient formation of a suitable chromophore with a BINOL derivative as the catalyst, allowed geometrical isomerization in good-to-excellent Z/E ratio and excellent-to-quantitative yields. The mechanism of this E→Z contra-thermodynamic isomerization was studied, and the formation of a transient chromophore species is suggested.
Synthesis of Chiral Indenylcobalt(I) Complexes and Their Evaluation in Asymmetric [2+2+2] Cycloaddition Reactions
Jungk, Phillip,T?ufer, Tobias,Thiel, Indre,Hapke, Marko
, p. 2026 - 2035 (2016/07/06)
The syntheses of two new indenyl-based cobalt(I) complexes were reported and their properties as catalysts in asymmetric cyclotrimerizations evaluated. While one complex was synthesized from a functionalized BINOL derivative by cross-coupling with 2-indenylboronate, the other complex was derived from a known chiral indenyl cobalt(I) complex by exchange of COD for two phosphite ligands, delivering the first chiral indenyl cobalt(I) complex, which can easily be activated thermally. The prepared complexes were tested in asymmetric cyclization reactions of triynes as well as diynes with nitriles to deliver chiral triaryls and heterobiaryls, respectively. While the BINOL-based precatalysts promoted the cyclizations in good yield without selectivity, the bisphosphite cobalt(I) complex induces chirality with up to 80% ee under photochemical as well as under thermal conditions.
Conformationally driven asymmetric induction of a catalytic dendrimer
Yu, Jianfeng,RajanBabu,Parquette, Jon R.
supporting information; scheme or table, p. 7845 - 7847 (2009/02/02)
Nature-s catalysts promote the reactions necessary for life with extremely high specificity by folding into specific shapes capable of communicating remote structural information to an active site. Achieving this objective in synthetic systems has been ha
Asymmetric allylboration of aldehydes and ketones using 3,3′-disubstitutedbinaphthol-modified boronates
Wu, T. Robert,Shen, Lixin,Chong, J. Michael
, p. 2701 - 2704 (2007/10/03)
Allylboronates derived from 3,3′-disubstituted 2,2′-binaphthols react with aldehydes and ketones to give the expected allylated products with up to >99:1 er. Highest selectivities were observed for aromatic ketones. The bis(trifluoromethyl) derivative is particularly outstanding in terms of reactivity, selectivity, and robustness.
Design of N-spiro C2-symmetric chiral quaternary ammonium bromides as novel chiral phase-transfer catalysts: Synthesis and application to practical asymmetric synthesis of α-amino acids
Ooi, Takashi,Kameda, Minoru,Maruoka, Keiji
, p. 5139 - 5151 (2007/10/03)
A series of C2-symmetric chiral quaternary ammonium bromides 10 and 11 have been designed as a new, purely synthetic chiral phase-transfer catalyst, and readily prepared from commercially available optically pure 1,1′-bi-2-naphthol as a basic c
EXPEDIENT ROUTE TO 3- AND 3,3'-SUBSTITUTED 1,1'-BI-2-NAPHTHOLS BY DIRECTED ortho METALATION AND SUZUKI CROSS COUPLING METHODS
Cox, Paul J.,Wang, Wei,Snieckus, Victor
, p. 2253 - 2256 (2007/10/02)
A directed ortho metalation-based route to 3- and 3,3'-substituted binaphthols 2a-c and 3a-c, including chiral materials, is described.Using the Suzuki cross coupling process, dibromo system 3a (E = Br) has been transformed into 3,3'-diaryl binaphthols 5.