Results 121 to 130 of about 229,644 (295)
Synthesis of Chiral‐at‐Sulfur(VI) Sulfonimidamide Brønsted Acids
Chemistry – A European Journal, EarlyView.A simple, modular route to chiral‐at‐sulfur(VI) Brønsted acids is described, delivering S‐chiral sulfonimidamides, C2‐symmetric acids, and BINOL‐based hybrid systems through stereospecific reactions of sulfonimidoyl fluorides and chlorides. ABSTRACT Herein, we report an efficient and simple strategy to access diverse chiral‐at‐sulfur(VI) Brønsted acids.
Yu Han +6 more
wiley +1 more source
Carboxylate–Probase Catalyzed Favorskii Reaction
Chemistry – A European Journal, EarlyView.Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh +4 more
wiley +1 more source
Crystallization‐Induced Emission Enhancements of Hybrid Butenolide‐Diphenylethenes
Chemistry – A European Journal, EarlyView.Hybrid butenolide‐diphenylethene fluorophores show crystallization‐induced emission enhancement (CIEE), with substituents tuning solid‐state quantum yields up to 50%. One derivative, BuCM, displays dual‐state emissions (DSE), making this compact scaffold a promising platform for CIEE/DSE‐active fluorophores.
Sujlesh Sharma +3 more
wiley +1 more source
ASSESSMENT OF VARIOUS DIAGNOSTIC PARAMETERS IN CASES OF ACUTE APPENDICITIS [PDF]
Perspectives In Medical Research, 2019 Introduction:Acute appendicitis is a common surgical emergency and appendectomy is one of the frequently done emergency surgical operations. Its diagnosis stills remain elusive due to its varying presentation.
Dr. AbbadiVenkat Mohan Reddy, Dr.MohdInayatulla Khan
doaj
TLC pattern of cyanobacterial extracts.
, 2015 TLC patterns of methanolic extracts of lyophilized Geitlerinema sp. CCC728 (a) and Arthrospira sp. CCC729 (c), using CCl4: methanol (9:1). The most potent bands from Geitlerinema sp. CCC728 (b) and Arthrospira sp.
Akanksha Srivastava (410877) +4 more
core +1 more source
Alkyne‐Assisted Stereospecific Skeletal Rearrangement via Nonclassical Carbocations
Chemistry – A European Journal, EarlyView.We report stereospecific nucleophilic substitution of homopropargylic alcohols enabled by alkyne anchimeric assistance. Alcohol activation triggers formation of a nonclassical cyclopropylidenemethyl cation, allowing efficient chirality transfer to densely substituted tertiary homopropargyl fluorides.
Rajan Kumar Kharwar +3 more
wiley +1 more source
Synthesis and Characterization of Hemiindigo‐Based Glycoside and Glycomacrocycle
Chemistry – A European Journal, EarlyView.Glycosyl hemiindigos: we have synthesized hemiindigo‐functionalized glycoside and glycomacrocycle which are photoswitchable under visible light irradiation with high photoconversion yield and fluorescence emission property in acetonitrile. The conformational constrained glycomacrocycle displayed more efficient photoisomerization.
Guilhem Fontaine +4 more
wiley +1 more source
Chemistry – A European Journal, EarlyView.Chiral cycloparaarylenes (CPAs) incorporating binaphthyl units were synthesized. The methoxy‐substituted and methylenedioxy‐bridged systems adopt D3‐ and C3/C1‐symmetric structures, respectively. They exhibited distinct solid‐state emission and aggregation‐induced emission enhancement (AIEE).
Kazuto Takaishi +3 more
wiley +1 more source
Rapid Identification of Ralstonia solanacearum by the Direct Colony TLC and Simple TLC
, 1998 Rapid identification of bacterial wilt pathogen, Ralstonia solanacearum was conducted by the direct colony TLC and simple TLC methods. All fourteen isolates from different host plants in Bangladesh exhibited similar chromatograms with R.
Furuya, Naruto +6 more
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