scholarly journals Synergistic Surface Basicity Enhancement Effect for Doping of Transition Metals in Nanocrystalline MgO as Catalysts towards One Pot Wittig Reaction

2021 ◽  
pp. 103134
Author(s):  
Mansur Moulavi ◽  
Kaluram Kanade ◽  
Dinesh Amalnerkar ◽  
Amanullah Fatehmulla ◽  
Abdullah.M. Aldhafiri ◽  
...  
Keyword(s):  
Transition Metals ◽  
Wittig Reaction ◽  
Enhancement Effect ◽  
One Pot ◽  
Surface Basicity ◽  
Nanocrystalline Mgo

scholarly journals Tandem oxidation–Wittig reaction using nanocrystalline barium manganate (BaMnO4); an improved one-pot protocol

2016 ◽  
Vol 57 (33) ◽  
pp. 3773-3775 ◽  
Author(s):  
Mohammad Gholinejad ◽  
Habib Firouzabadi ◽  
Maedeh Bahrami ◽  
Carmen Nájera
Keyword(s):  
Wittig Reaction ◽  
One Pot

One-Pot Synthesis of 3-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-isoquinolin-1(2H)-ones by Sequential DEAD-Promoted Oxidative Ugi/Wittig Reaction Starting from Phosphonium Salt Precursors

Synlett ◽  
2021 ◽  
Author(s):  
Long Zhao ◽  
Mao-Lin Yang ◽  
Mei Sun ◽  
Ming-Wu Ding
Keyword(s):  
Wittig Reaction ◽  
Phosphonium Salt ◽  
One Pot ◽  
One Pot Synthesis ◽  
Sequential Reactions

A new one-pot Synthesis of 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)- isoquinolin-1(2H)-ones by DEAD-promoted oxidative Ugi/Wittig reaction was developed. The sequential reactions of (2-carboxybenzyl)triphenylphosphonium salts, isocyanides and N-aryl-1,2,3,4-tetrahydroisoquinolines produced 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)- isoquinolin-1(2H)-ones in moderate to good overall yields in the presence of DEAD and Et3N.

DEAD-Mediated Oxidative Ugi/Aza-Wittig Reaction for the Synthesis of 5-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-1,3,4-oxadi­­azoles Starting from (N-Isocyanimine)triphenylphosphorane

Synthesis ◽  
2020 ◽  
Author(s):  
Ming-Wu Ding ◽  
Mei Sun ◽  
Long Zhao ◽  
Yan-Ling Yu
Keyword(s):  
Carboxylic Acids ◽  
Wittig Reaction ◽  
One Pot

AbstractA one-pot protocol for the synthesis of 5-(1,2,3,4-tetra­hydroisoquinolin-1-yl)-1,3,4-oxadiazoles via DEAD-mediated oxidative Ugi/aza-Wittig reaction has been developed. The reaction of (N-iso­cyanimine)triphenylphosphorane, carboxylic acids, and N-aryl-1,2,3,4-tetrahydroisoquinolines produced polysubstituted 5-(1,2,3,4-tetra­hydroisoquinolin-1-yl)-1,3,4-oxadiazoles directly in good yields in the presence of DEAD as an oxidant.

Green synthetic methodology: An evaluative study for impact of surface basicity of MnO2 doped MgO nanocomposites in Wittig reaction

2019 ◽  
Vol 269 ◽  
pp. 167-174 ◽  
Author(s):  
M.H. Moulavi ◽  
B.B. Kale ◽  
D. Bankar ◽  
D.P. Amalnerkar ◽  
A. Vinu ◽  
...  
Keyword(s):  
Wittig Reaction ◽  
Synthetic Methodology ◽  
Evaluative Study ◽  
Surface Basicity

scholarly journals Synthesis and Antioxidant Activity of Caffeic Acid Derivatives

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2199 ◽  
Author(s):  
Katarzyna Sidoryk ◽  
Anna Jaromin ◽  
Nina Filipczak ◽  
Piotr Cmoch ◽  
Marcin Cybulski
Keyword(s):  
Organic Chemistry ◽  
Antioxidant Activity ◽  
Caffeic Acid ◽  
Wittig Reaction ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Water Medium ◽  
One Pot ◽  
Safe Alternative ◽  
Caffeic Acid Derivatives

A series of caffeic acid derivatives were synthesized via a modified Wittig reaction which is a very important tool in organic chemistry for the construction of unsaturated carbon–carbon bonds. All reactions were performed in water medium at 90 °C. The aqueous Wittig reaction worked best when one unprotected hydroxyl group was present in the phenyl ring. The olefinations in the aqueous conditions were also conducted with good yields in the presence of two unprotected hydroxyl groups. When the number of the hydroxyl groups was increased to three, the reaction yields were worse, and the derivatives 12, 13, and 18 were obtained with 74%, 37%, and 70% yields, respectively. Nevertheless, the Wittig reaction using water as the essential medium is an elegant one-pot synthesis and a greener method, which can be a safe alternative for implementation in organic chemistry. The obtained compounds were tested for their antioxidant activity, and 12, 13, and 18 showed the highest activities. Moreover, all synthesized compounds displayed no cytotoxicity, and can therefore be used in the pharmaceutical or cosmetic industry.

scholarly journals Lightning-Rod Effect of Plasmonic Field Enhancement on Hydrogen-Absorbing Transition Metals

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1235 ◽  
Author(s):  
Norihiko Fukuoka ◽  
Katsuaki Tanabe
Keyword(s):  
Transition Metals ◽  
Metal Surfaces ◽  
Noble Metals ◽  
Field Enhancement ◽  
Operating Conditions ◽  
Optical Systems ◽  
Field Energy ◽  
Enhancement Effect ◽  
Morphological Aspect ◽  
Aspect Ratios

The plasmonic enhancement of electromagnetic field energy density at the sharp tips of nanoparticles or nanoscale surface roughnesses of hydrogen-absorbing transition metals, Pd, Ti, and Ni, is quantitatively investigated. A large degree of energy focusing is observed for these transition metals in the microwave region, even surpassing the enhancement for noble metals according to the conditions. Pd, for instance, exhibits peak field enhancement factors of 6000 and 2 × 108 in air for morphological aspect ratios of 10 and 100, respectively. Metal surfaces possibly contain such degrees of nano- or micro-scale native random roughnesses, and, therefore, the field enhancement effect may have been unknowingly produced in existing electrical and optical systems. In addition, for future devices under development, particularly in hydrogen-related applications, it is desirable to design and optimize the systems, including the choice of materials, structures, and operating conditions, by accounting for the plasmonic local energy enhancement effect around the metal surfaces.

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