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LAB MEDCHEM ORG CHEM > synthesis of benzoic acid > Flashcards

synthesis of benzoic acid Flashcards

1
Q

what properties does benzoic acid have?

A

antifungal properties and antimicrobial for preservatives

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2
Q

when was benzoic acid discovered?

A

16th century

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3
Q

what other compounds do benzoic can be obtained from?

A

castoreum - castor sacs of the North American Beaver

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4
Q

What is the major source of the benzoic acid and how is it obtained?

A

GUM BENZOIN - dry distillation

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5
Q

two chemical name of the benzoic acid

A

benzene carboxylic acid

phenyl formic acid

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6
Q

is it a complex or simplest aromatic carboxylic acid?

A

simplest aromatic carboxylic acid

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7
Q

melting point of benzoic acid

A

122.4 degree Celsius

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8
Q

boiling point of benzoic acid

A

250 degree Celsius

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9
Q

physical properties of benzoic acid

A

white crystalline powder

non offensive odor

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10
Q

a balsamic resin, that exudes from the incised stem of the 4 trees

A

benzoin

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11
Q

salts and esters of benzoic acid

A

benzoates

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12
Q

antimicrobial activity of benzoic acid in pH

A

pH 2.5 - pH 4.5

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13
Q

what are the 4 trees that can be obtain benzoin

A

Java
Borneo
Siam
Sumatra

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14
Q

other name of gum benzoin and its scientific name

A

gum of Chinese balsam

Styrax tonkinensis

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15
Q

provide Uses of benzoic acid:

A

precursor for plasticizer and dispersants
food preservatives (sodium benzoate)
intermediate material for biosynthesis of secondary metabolites
important precursor for industrial synthesis of organic solvents
topical antiseptic and decongestants
expectorant
analgesic
antiseptic

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16
Q

Chemical reaction involved in synthesis of benzoic acid

A

1) C8OH8 + 3NaOCl ———–C7O2NaH5 + CHCl3 + 2NaOH ———–C7H6O2
Acetophenone + Sodium ———–Sodium + Chloroform + sodium ———-benzoic acid hypochlorite benzoate hydroxide

17
Q

Color or precipitation test:

benzoic acid + water + hydrochloric acid + ferric chloride TS

A

white precipitation

18
Q

Odor test:

benzoic acid + n-propyl alcohol + concentrated sulfuric acid

A

pleasant odor/benzaldehyde-like odor

19
Q

solubility test:

benzoic acid + sodium hydroxide solution

A

slightly soluble

20
Q

percentage of benzoic acid in gum benzoin

A

13% - 20%

21
Q

other sources of benzoic acid which it is the main ingredient

A

tincture of benzoin

Friar’s balsam

22
Q

form of benzoic acid as a food preservatives

A

sodium benzoate

23
Q

chemical formula of benzoic acid

A

C7H602

LAB MEDCHEM ORG CHEM (3 decks)

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