Silica Gel Promotes Reductions of Aldehydes and Ketones by N-Heterocyclic Carbene Boranes

2012 ◽  
Vol 14 (17) ◽  
pp. 4540-4543 ◽  
Author(s):  
Tsuyoshi Taniguchi ◽  
Dennis P. Curran
Keyword(s):  
Silica Gel ◽  
Aldehydes And Ketones

Oxidation of Aldehydes and Ketones into Carboxylic Acids and Esters Using 4-Amino-2-chloroperbenzoic Acid Supported on Silica Gel.

ChemInform ◽  
2005 ◽  
Vol 36 (36) ◽  
Author(s):  
Mohammed M. Hashemi ◽  
Dadkhoda Ghazanfari ◽  
Yousef Ahmadibeni ◽  
Zahed Karimi-Jaberi ◽  
Ali Ezabadi
Keyword(s):  
Carboxylic Acids ◽  
Silica Gel ◽  
Aldehydes And Ketones

scholarly journals N-Ethylbenzylammonium Fluorochromate (VI) Adsorbed on Silica Gel, a Mild and Selective Heterogeneous Reagent

2019 ◽  
Vol 54 (4) ◽  
Author(s):  
S. Zahra Sayyed-Alangi ◽  
Mohammad T. Baei
Keyword(s):  
Silica Gel ◽  
Reaction Rate ◽  
Secondary Alcohols ◽  
Selective Method ◽  
Aldehydes And Ketones ◽  
Work Up

A mild and selective method for the oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones with N-ethylbenzylammonium fluorochromate (VI), EBAFC, is reported. Stability, reaction rate, ease of work-up and efficiency of the EBAFC are considerably increased upon its adsorption on silica gel. The N-ethylbenzylammonium fluorochromate (VI) adsorbed on silica gel is inert to aldehydes, ketones, oximes, thiols, sulfides, phenols, pyrans, trimethylsilanes, malonates and thioacetamides.

scholarly journals Gaseous environment modulates volatile emission and viability loss during seed artificial ageing

Planta ◽  
2021 ◽  
Vol 253 (5) ◽  
Author(s):  
Biao Han ◽  
Vincent Fernandez ◽  
Hugh W. Pritchard ◽  
Louise Colville
Keyword(s):  
Silica Gel ◽  
Storage Temperature ◽  
Atmospheric Oxygen ◽  
Seed Longevity ◽  
Gas Chromatography Mass Spectrometry ◽  
Artificial Ageing ◽  
Seed Moisture Content ◽  
Maillard Reactions ◽  
Gaseous Environment ◽  
Aldehydes And Ketones

Abstract Main conclusion Modulation of the gaseous environment using oxygen absorbers and/or silica gel shows potential for enhancing seed longevity through trapping toxic volatiles emitted by seeds during artificial ageing. Abstract Volatile profiling using non-invasive gas chromatography–mass spectrometry provides insight into the specific processes occurring during seed ageing. Production of alcohols, aldehydes and ketones, derived from processes such as alcoholic fermentation, lipid peroxidation and Maillard reactions, are known to be dependent on storage temperature and relative humidity, but little is known about the potential modulating role of the gaseous environment, which also affects seed lifespan, on volatile production. Seeds of Lolium perenne (Poaceae), Agrostemma githago (Caryophyllaceae) and Pisum sativum (Fabaceae) were aged under normal atmospheric oxygen conditions and in sealed vials containing either oxygen absorbers, oxygen absorbers and silica gel (equilibrated at 60% RH), or silica gel alone. Seeds of A. githago that were aged in the absence of oxygen maintained higher viability and produced fewer volatiles than seeds aged in air. In addition, seeds of A. githago and L. perenne aged in the presence of silica gel were longer lived than those aged without silica, with no effect on seed moisture content or oxygen concentration in the storage containers, but with silica gel acting as a volatile trap. These results indicate that the use of inexpensive oxygen absorbers and silica gel could improve seed longevity in storage for some species and suggests a potential, and previously unidentified, role for silica gel in ultra-dry storage.

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