Search results for "54"
showing 10 items of 2200 documents
Straightforward Electrochemical Sulfonylation of Arenes and Aniline Derivatives using Sodium Sulfinates
2019
Developments in the dehydrogenative electrochemical synthesis of 3,3′,5,5′-tetramethyl-2,2′-biphenol
2021
Abstract The symmetric biphenol 3,3′,5,5′‐tetramethyl‐2,2′‐biphenol is a well‐known ligand building block and is used in transition‐metal catalysis. In the literature, there are several synthetic routes for the preparation of this exceptional molecule. Herein, the focus is on the sustainable electrochemical synthesis of 3,3′,5,5′‐tetramethyl‐2,2′‐biphenol. A brief overview of the developmental history of this inconspicuous molecule, which is of great interest for technical applications, but has many challenges for its synthesis, is provided. The electro‐organic method is a powerful, sustainable, and efficient alternative to conventional synthesis to obtain this symmetric biphenol up to the …
Electrochemical nitration with nitrite
2021
Aromatic nitration has tremendous importance in organic chemistry as nitroaromatic compounds serve as versatile building blocks. This study represents the electrochemical aromatic nitration with NBu4 NO2 , which serves a dual role as supporting electrolyte and as a safe, readily available, and easy-to-handle nitro source. Stoichiometric amounts of 1,1,1-3,3,3-hexafluoroisopropan-2-ol (HFIP) in MeCN significantly increase the yield by solvent control. The reaction mechanism is based on electrochemical oxidation of nitrite to NO2 , which initiates the nitration reaction in a divided electrolysis cell with inexpensive graphite electrodes. Overall, the reaction is demonstrated for 20 examples w…
Gozos al glorioso San Gregorio Papa.
El full orlat. Grav. xil. enmarcat del sant. Text del goig a dues col. separades per banda.
Gozos al glorioso San Gregorio Papa.
El full orlat. Grav. xil. enmarcat del sant. Text del goig a dues col. separades per banda.
Gozos al glorioso San Gregorio Papa.
El full orlat. Grav. xil. enmarcat de "S. Gregorio", flanquejat per cistelles amb flors. Text del goig a dues col. separades per banda.
Gozos al glorioso San Gregorio Papa
1750
El full orlat Grav. xil. enmarcat del sant "Thos. Pez. Ft." Text del goig a dues col. separades per banda
Design of Photovoltaic System for Rural Electrification in Rwanda
2017
Master's thesis Renewable Energy ENE500 - University of Agder 2017 In this century of accelerated development in various domains, some African countries are still facing a challenge of lack of power due to its scarce in some places, where by the main source of power (generation of electricity) is hydro since thermal and fuel are still on a small scale. This problem results in less productivity and economic decline of some countries like Rwanda which is among African countries that are at a very high speed in development, the grid lines from distant places are stack and they are few compared to the need of electricity in all corners of the country, especially in rural areas whereby each hous…
Metric Lie groups admitting dilations
2019
We consider left-invariant distances $d$ on a Lie group $G$ with the property that there exists a multiplicative one-parameter group of Lie automorphisms $(0, \infty)\rightarrow\mathtt{Aut}(G)$, $\lambda\mapsto\delta_\lambda$, so that $ d(\delta_\lambda x,\delta_\lambda y) = \lambda d(x,y)$, for all $x,y\in G$ and all $\lambda>0$. First, we show that all such distances are admissible, that is, they induce the manifold topology. Second, we characterize multiplicative one-parameter groups of Lie automorphisms that are dilations for some left-invariant distance in terms of algebraic properties of their infinitesimal generator. Third, we show that an admissible left-invariant distance on a Lie …
Segunda parte de las epístolas familiares del ... señor don Antonio de gueuara ... obispo que fue de mondoñedo ...
1549
Sig. A10, B-H8, I12, K-N8, O6. - Data d'impr. al colofó "Acabose lunes a ocho dias del mes de julio. Año... de mil y quinientos y quarenta y nueue años" V.II. - CXVIII [i.e.CXVI] f. Escut imperial i escuts episcopals de l'autor a la port. - Capitals grav. Port. amb orla xil., a dos tintes. - Lletra gòtica. - Tots els f. orlats. - Erates de fol., del f.X passa al IX