КНИГИ НА АНГЛИЙСКИЙ ЯЗЫКЕ, ИМЕЮЩЕЕ ОТНОШЕНИЕ К СЛОВУ «LEUCO BASE»
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Combined Compendium of Food Additive Specifications: ...
Calculations Calculate the percent leuco base in the sample using the following
equation: % leuco base = 100 x [(A4 - A3) - (A2 - A,)] x 1 liter x F/(a x b x W x R)
where A1....A4 are the recorded absorbances of curves 1, 2, 3, and 4,
respectively; ...
Malachite green is prepared by condensing dimethyl aniline (2 molecules) with
benzaldehyde (1 molecule) at 100°C. The leuco base produced is oxidised with
lead dioxide to produce malachite green. It dyes wool and silk directly. Crystal ...
A leuco base is a specific type of leuco compound and is made coloured or
colourless through oxidation and reduction, respectively. Schiffs reagent is often
wrongly referred to as a leuco base, but it is not because oxidation and reduction
are ...
Guy Orchard, Brian Nation, 2011
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Aliphatic Compounds: Sulphur, Phosphorus Silicon & Boron
The salts are easily reconverted into the leuco-base. oxidation acid leuco-base <
i± colour -base < > dye (colourless) reduction (colourless) alkali (coloured)
Malachite Green is prepared by condensing dimethylaniline (2 molecules) with ...
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Ancient Wine: The Search for the Origins of Viniculture
This family of dyes is characterized by their ability to be reduced to a soluble dye
(the leuco base, which is yel- lowish) and then reprecipitated to the solid on
exposure to air (oxy- gen). This chemical behavior of the indigoid dyes enables
them ...
Patrick E. McGovern, 2013
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Ionic Equilibria in Analytical Chemistry
Sn2+ can also be characterized by its property to reduce methylene blue into
hydrochloric acid, giving the corresponding leuco base: Sn2+ + methylene blue +
H+ —> Sn4+ + methylene blue (leuco base). The methylene blue/leuco base ...
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Functional Polymer Films
+2n e' '1' '1' '1' '1' Reduction '(I 'II N N N N N N + 2n A + ' + ' Oxidation A' A' n 2" (a)
—2n e' Emeraldine salt Leuco base +2n H' H H H H *2” e. H H 1 1 1 1 Reduction
I I ~o~o~o~ - 40% + o + o Oxidation (1| n —2n H' 2" -2n e' Emeraldine salt ...
Wolfgang Knoll, Rigoberto C. Advincula, 2013
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Organic Chemistry For Competitive Examination
H2SO4 to give a leuco base (Gr. leuco = colourless). Oxidation of the leuco base
with lead oxide followed by treatment with HC1 yields the dye. Malachite green is
used as a direct dye for wool and silk. N(CH3)2 i _ N(CH3)2 Benzaldehyde W ...
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T.B. Of Organic Chemistry (M.E.)
It is obtained by treating benzaldehyde ( 1 mole) with yV^V-dimethylaniline (two
moles) in the presence of concentrated sulphuric acid to give Leuco Base (Gr.
leuco = colourless). Oxidation of the leuco base with lead oxide followed by ...
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The Chemistry of Heterocyclic Compounds, Condensed Thiophene ...
Among several obvious properties that a. successful commercial dye must
possess is the ability to form a soluble sodium salt of the leuco base easily and
quantitatively, and the leuco base must be quite easily reoxidized by air to the
original ...
