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1
Progress in the Chemistry of
Quinoidal Natural Products
In addition to this experimental work, computational methods were developed for the evaluation of a synthesis of exiguamines A and B. This work culminated in a rapid, potentially biomimetic total synthesis of these two natural products.
Jean-Philip George Lumb, 2008
yield, 0.42 g.; 0.5 g. in 10 cc. CHCL treated with a soln. of 0.6 g. Br and then
slowly with 20 cc. cold Et¢O gives 0.7 g. of the quinoidal perbmmide of di-p-
anisylhydroxylamine N-oxide, MeOC,PLN (1 O): C,H¢-.O(Br.Br=)Me, crystals with
Cu luster ...
3
Food: The Chemistry of Its Components
Above pH 3 the small residual proportion of the anthocyanins in the form of a
flavylium cation begin to lose protons, forming first the non-ionised quinoidal
base, which is weakly purple in colour, and then the ionised quinoidal base,
which is ...
4
Wine Tasting: A Professional Handbook
Those that exist in the flavylium state generate a red hue, while those in the
quinoidal state give a bluish tint. The proportion of each state depends primarily
on the pH and sulfur dioxide content of the wine. Low pH enhances redness (
favors ...
5
Fermented Beverage Production
The effect of pulp and/or juice oxidation on juice color was described above (see
Figure 4-2), and this sets the primary appearance of the juice that results from the
quinoidal oxidation products of phloridzin, epi- catechin, and the procyanidins ...
Andrew G.H. Lea, John Piggott, 2003
6
PROG NUCLEIC ACID RES&MOLECULAR BIO
The quinoidal oxygen, and an unreduced quinoidal ring system are also required
for actinomycin to react with DNA. Since the reduced, leuco form is easily
autoxidizable, the unsubstituted leuco compound cannot be tested in biological
assays ...
J. N. Davidson, Waldo E. Cohn, 1964
7
Advances in Environmental Science and Engineering
The reaction products are highly colored because of their quinoidal structure and
it is these compounds which are the cause of the yellow color normally attributed
to oxidized oil. The quinoidal product is not sufficiently polar to be adsorbed by ...
James R. Pfafflin, Edward N. Ziegler, 1986
8
The Chemistry of Heterocyclic Compounds, The Pyrimidines
However, groups other than an oxo or thioxo substituent may also stabilize
quinoidal tautomers, usually by hydrogen bonding to ring nitrogen. Hence, 3-
methyl-2-phenacyl- 4(3/f)-pyrimidinone (9, R = H) and its p-bromo analog (9, R =
Br) both ...
9
Bulletin of the Chemical Society of Japan
Qunitet State Quinoidal Diradical Dicarbene (o2, a2) p-Phenylenebis(diradical)
Scheme 1. ring-closure a: ring-opening 31* 3,5-Cyclohexadien-1,2-
ylidenedimethyl [o-Phenylenebis(diradical)] Scheme 2. 1,2-2 3,2-2 N CH CH 1,2-
3 3,2-3 -+- ...
10
Chemical and Functional Properties of Food Components, Third ...
As the pH is increased, a rapid proton loss occurs to yield the red or blue
quinoidal base A, usually existing in two forms (Figure 9.3). On standing, a further
reaction occurs, that is, hydration of flavylium cation AH+ to yield a colorless
carbinol ...
Zdzislaw E. Sikorski, 2006
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A solution for tunable dyes
Different solvents can cause benziphthalocyanine to shift between its strongly aromatic quinoidal form and its weakly aromatic phenol form, which changes the ... «Nanowerk, 九月 14»
Scientific symposium today on healthful antioxidants in plant-based …
Anthocyanins typically exist as the red flavylium cation in acidic solutions and as the blue quinoidal base anion in basic solutions. However, the quinoidal base ... «EurekAlert, 九月 13»
Designing Organic Semiconducting Materials: The Promise of …
For these systems, it is thought that increasing quinoidal character in the ground state has a greater effect than limiting bond length alternation. «Azom.com, 二月 11»
