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Propionaldehyde exhibits the reactions characteristic of alkyl aldehydes, e.g. hydrogenation, aldol condensations, oxidations, etc. It is the simplest aldehyde with a prochiral methylene such that α-functionalized derivatives (CH 3 CH(X)CHO) are chiral. If water is available, propionaldehyde exists in equilibrium with 1,1-propanediol, a ...
Another possible pathway is through the reaction of propynylidyne (C 3 H) with water. [4] Hazards. The compound is explosive, possibly because it tends to polymerize. [1]
Many soluble salts of acid dyes synthesized for textile-related purposes were transformed into insoluble salts or lake pigments by reaction with water-soluble salts of calcium, barium or lead, whereas basic dyes were treated with tannins or antimony potassium tartrate to yield pigments. [4] Synthetic coal tar alizarin dye samples, 1908.
Here he detailed the synthesis of porphine, the fundamental ring system in all the porphyrins. He performed the porphin synthesis at a temperature of 90-95 °C and high pressure in sealed pyrex glass tubes, by reacting pyrrole, 2 % formaldehyde and pyridine in methanol for 30 hours.
A Knoevenagel condensation is a nucleophilic addition of an active hydrogen compound to a carbonyl group followed by a dehydration reaction in which a molecule of water is eliminated (hence condensation). The product is often an α,β-unsaturated ketone (a conjugated enone). General Knoevenagel layout
Solvents that are hydrogen donors (i.e. water, acids), will affect the visible absorption spectra by engaging in hydrogen bonding or donating the hydrogen outright, making the molecule favor the zwitterionic resonance form; an example of this may be seen in the picture where acetic acid, though less polar than water, was able to produce a more ...
For example, ethyl formate or orthoformate reacts with two equivalents of phenylhydrazine to yield 1,5-diphenylformazan, under acidic conditions. Under basic conditions, ethyl nitrate reacts at the methylene position to yield 3-methyl-1,5-diphenylformazan, which can also be obtained from the reaction of phenylazoethane with isoamyl nitrite .
Samples of halogenated BODIPY dyes in ambient lighting and fluorescing under UV. BODIPY is the technical common name of a chemical compound with formula C 9 H 7 BN 2 F 2, whose molecule consists of a boron difluoride group BF 2 joined to a dipyrromethene group C 9 H 7 N 2; specifically, the compound 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene in ...