与 «PIPERIC ACID»相关的英语书籍
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1
The Last American Frontier
(ii) Hydrolysis of piperine with alkali (Babo et al., 1857) gives piperic acid, C]2H|
0O4 and piped C5HMN. Thus the alkaloid piperine is piperidine amide of piperic
acid. KOH C17H„0,N + H20 > C,:H10O4 + H Piperine Piperic acid Piperidine The
...
2
The Alkaloids: Chemistry and Physiology V1: Chemistry and ...
The acidic product of hydrolysis, piperic acid (C12H1004, m.p. 216—217°) (24,
25), when fused with potassium hydroxide, gave protocatechuic acid (27), While
addition occurred when bromine was added to the Cm-acid. One mole of
bromine ...
R. H. F. Manske, Henry Lavergne Holmes, 1965
3
Chemistry of Natural Products
A. Structure of Piperine Piperine on hydrolysis yielded piperidine and piperic acid
4.286, further oxidation of which gave piperonylic acid 4.287 (Figure 4.56) and
tartaric acid. Piperic acid has trans, trans geometry of the double bonds. 4.22.
Sujata V. Bhat, Bhimsen A. Nagasampagi, Meenakshi Sivakumar, 2005
4
Quality Assurance in Spices and Spice Products
On hydrolysis by acids or alkalies, piperine decomposes into the strongly basic
piperine (C',H,N903) (II) (in Fig 5.1) and piperic acid (C12 Hm 0,) (Ill) (see Fig 5.1)
m.p. 215° C, slightly soluble in water, soluble in alcohol or either. Piperine is ...
5
Natural Products: A Laboratory Guide
o. —. c. KOH CH3OH H Piperidine Piperic acid disulfide. The structure of piperic
acid was deduced from its oxidation by potassium permanganate to yield oxalic
acid, piperonal, and piperonylic acid. HOOC-CH HC— CH O — CH2 KMnO4 ...
6
Organic Chemistry For Competitive Examination
When piperine is hydrolysed with aqueous KOH, piperic acid and piperidine are
obtained. C1/H1gC^N + H2O ^ * C11HgO2.COOH + CsH-1oNH Piperine Piperic
acid Piperidine This shows that piperine is the piperidine amide of piperic acid ...
3. Properties. Piperine is a colourless crystalline solid melting at 128–129°C. It is
insoluble in water but soluble in common organic solvents. On hydrolysis with a
base, piperine gives piperic acid and piperidine.
8
A Dictionary of Chemistry and the Allied Branches of Other ...
1874, 1314). PIPERIG ACID, C"H'°O'. The constitution of this acid has been
studied by Fittig a. Mielk (Liebig's Annalen, clxxii. 134). Piperonylic acid, C'H'O',
the product of oxidation of piperic acid, having been shown by former
experiments (vii.
9
Organic Reactions: Mechanism With Problems
CHCOOH Cinnamylacrylic acid This reaction finds application in the synthesis of
piperic acid and hence piperine(an alkaloid). H,C CHO H=CH.CHO CHCHO -
Perkin reaction NaOH CHO CH.CH=CH.COOH I2^\o II .| OpcI5 Piperic acid H C (
if) ...
10
T.B. Of Organic Chemistry (M.E.)
Structure of Side-chain. When oxidised with potassium permanganate, piperic
acid first forms an aldehyde, piperonal, and then piperonylic acid. Piperic acid
Piperonal Piperonylic acid Piperonylic acid is C4H4 less than piperic acid and so
is ...
