Results 131 to 140 of about 9,174 (269)

Infrared and ultraviolet spectrophotometric analysis of chromatographic fractions of crude oils and petroleum products

Bulletin of the Chemical Society of Ethiopia, 2007
Samples of light, medium and heavy Nigerian crude oils and petroleum products including diesel oil, engine oil (SAE 40) and gasoline (PMS) have been separated into four fractions of saturates, monoaromatics, diaromatics and polyaromatics by elution ...
E.O. Odebunmi, S.A. Adeniyi
doaj  

Regioselective Synthesis and Cytotoxic Effects of New Juglone Derivatives with an Aliphatic Substituent at C(2) or C(3)

Biomolecules
The naphthoquinone juglone (5-hydroxynaphthalene-1,4-dione) (1) occurs abundantly in nature, especially in species belonging to the Juglandaceae family. Due to its multifaceted biological activities, this compound is considered a privileged structure in ...
Giovanni Vidari, Emanuele Casali, Andrea Magni, Sirwan T. Othman, Giuseppe Zanoni, Alessio Porta   +5 more
doaj   +1 more source

The metalation of 1- and 2-(trifluoromethyl)naphthalenes: Noteworthy site selectivities

This article provides insight into the various factors by which electroneg. substituents affect the kinetic acidity of arenes and, more specifically, naphthalenes.
Cottet, Fabrice, Schlosser, Manfred, Castagnetti, Eva   +2 more
core   +1 more source

Synthesis of Dihomocalix[4]naphthalenes:  First Members of a New Class of [1.2.1.2](1,3)Naphthalenophanes

, 2016
Synthesis of Dihomocalix[4]naphthalenes:  First Members of a New Class of [1.2.1.2](1,3 ...
Paris E. Georghiou (828618), Zhaopeng Li (3036696), Muhammad Ashram (3027216), David O. Miller (1662712)   +3 more
core   +1 more source

Water, Alcohols, Amines, and Amides as Formal Hydrogen‐Atom‐Transfer Reagents Through Activation With Redox‐Active Lewis Acids

Angewandte Chemie, EarlyView.
Protic molecules containing strong O─H or N─H bonds typically resist hydrogen‐atom abstraction because of the high reactivity of the resulting heteroatom‐centered radicals. However, association of the protic molecules with redox‐active Lewis acids can provide powerful hydrogen‐atom donors or proton‐coupled‐electron‐transfer reagents.
Petra Vojáčková, Armido Studer
wiley   +2 more sources

Synthesis of Large‐ and Medium‐Sized Heterobiaryl Atropisomeric Rings and Atropopeptides by Catalytic Intramolecular SNAr

Angewandte Chemie, EarlyView.
Catalytic, intramolecular N‐heterocycle arylation by nucleophilic aromatic substitution (SNAr) is now available for synthesis of highly strained macrocycles and medium‐sized heterobiaryl atropisomeric rings, including atropopeptides. Key to the approach is the ability to generate a strong base catalytically, taking advantage of base‐embedding ...
Alireza Abbasi Kejani, Paritosh Dey, Nicholas H. Stillman, Daniel M. Andrade, Michal Šimek, Martin Dračínský, Daniel Bím, Paulo H. S. Paioti   +7 more
wiley   +2 more sources

1,2‐Bis(boronate) Arenes by Borylation Directed Borylation

Angewandte Chemie, EarlyView.
Boron electrophiles derived from tetrabromo‐pyrazaboles and AlCl3 affect the regioselective vicinal double C–H borylation of a range of arenes and polycyclic aromatic hydrocarbons (PAHs). A subsequent pinacol installation step then affords the vicinal bis‐boronate ester‐substituted arene/PAH.
Anna V. Schellbach, Mathew J. Cross, Emily Noone, Cate S. Anstöter, Michael J. Ingleson   +4 more
wiley   +2 more sources

An X‑Shaped Chiral Non‑Fullerene n‐Type Semiconductor: Application in Perovskite Solar Cells and Chirality‑Induced Spin Selectivity

Angewandte Chemie, EarlyView.
A highly electron‑accepting derivative of cyclobisbiphenylenecarbonyl (CBBC‐TIC) is reported. CBBC‐TIC functions as an electron‐transport layer for perovskite solar cells, achieving a power conversion efficiency of 20.6%. Furthermore, the enantiomers of CBBC‐TIC exhibited spin‐selective electron transport with high enantiospecific magnetic conductance ...
Yuki Sakamoto, Koki Otsuka, Kuraudo Ishihara, Shuang Li, Ai Shimazaki, Megumi Haramatsu, Junichiro Hirano, Juntaro Nogami, Hiroshi Shinokubo, Hiroki Uratani, Hironori Kaji, Fumitaka Ishiwari, Akinori Saeki, Tomoya Nakamura, Atsushi Wakamiya, Norihito Fukui   +15 more
wiley   +2 more sources

Benzotriazole-Assisted Aromatic Ring Annulation:  Efficient and General Syntheses of Polysubstituted Naphthalenes and Phenanthrenes

, 2016
(Benzotriazol-1-ylmethyl)benzenes and -naphthalenes 1a−f, easily accessible from benzyl bromides and benzotriazole, readily undergo lithiation and subsequent 1,4-addition to α,β-unsaturated aldehydes and ketones.
Linghong Xie (3037746), Guifen Zhang (752058), Alan R. Katritzky (455231)   +2 more
core   +1 more source

Phosphine-Mediated Multi-Component γ-Umpolung/Aldol/Wittig Cascade Reaction for the Synthesis of Functionalized Naphthalenes [PDF]

, 2013
This study describes an efficient and convenient triphenylphosphine-mediated γ-umpolung/aldol/Wittig cascade reaction. This is the first time that phosphine has been used to mediate a multi-component coupling reaction involving alleonates, nucleophiles ...
Zhang, Kui
core