Archive for the ‘Uncategorized’ Category
synthesis OF t-alcohols
Tertiary alcohols, R1 R2 R3.COH, may be synthesised by
Action of the Grignard reagent upon diethyl carbonate
In: Uncategorized · Tagged with: ALCOHOLS, synthesis
UREA
UREA
Wohler’s classical synthesis of urea from ammonium cyanate may be carried
out by evaporating solutions of sodium cyanate and ammonium sulphate
In aqueous solution at 100° the change is reversible and equilibrium is reached when 95 per cent, of the ammonium cyanate has changed into urea. Urea is less soluble in water than is ammonium sulphate, hence [...]
In: Uncategorized · Tagged with: UREA
Pseudo-saccharin ethers
Pseudo-saccharin ethers.
Pseudo-saccharin chloride reacts with alcohols to give ethers (0-alkyl derivatives of
saccharin) :
Heat a little pseudo-saccharin chloride with excess of the anhydrous alcohol in a test-tube until hydrogen chloride is no longer evolved. Recrystallise from alcohol or other organic solvent. With the lower primary alcohols, heating at 100° for 10 minutes uffices: [...]
In: Uncategorized · Tagged with: Pseudo-saccharin ethers
ALCOHOLS
REACTION OF ALIPHATIC ALCOHOLS WITH ACETYLE CHLORIDE.
Treat 1 ml. of the alcohols enumerated
in (iv) cautiously with 0-5-0-7 ml. of acetyl chloride. Observe the
reaction which occurs. After 2-3 minutes, pour the contents of the
various test-tubes into 3 ml. portions of water, neutralise the aqueous
layer with solid sodium bicarbonate, and examine the residual liquids
for [...]
In: Uncategorized · Tagged with: ALCOHOLS
ALCOHOLS
REACTIONS OF ALIPHATIC ALCOHOLS with sodium.
Treat 2 ml. of absolute methyl alcohol with a small thin slice of dry, freshly-cut sodium Observe the result. Cool the solution when all the sodium has reacted. Add a little water and test the solution with litmus paper. Obtain five small dry test-tubes and introduce 1 ml. of the [...]
In: Uncategorized · Tagged with: ALCOHOLS
ALIPHATIC ALCOHOLS
REACTIONS AND CHARACTERIZATION OF
ALIPHATIC ALCOHOLS
Carry out the following simple experiments ; these have been selected to illustrate some of the general properties of alcohols.
(i) Miscibility with water. Measure out 3-1 ml. (2-5 g.) of n-butyl alcohol into a dry 100 ml. conical or flat-bottomed flask provided with a well-fitting stopper. From a burette add distilled [...]
amiation of alpha-halo acids
proteins and nucleoic acds
proteins take up a large part of body. they hold it together and round it they are found in all living cell. they are the principle martial of the skin, muscle, fates, and blood of enzymes, anti bodies, and harmonies
chemically protein are higher higher ply amides. a single protein molecule contains hundreds or [...]
In: Uncategorized · Tagged with: nucleoic acds, proteins
Preparation of Sodium Triacetoxyborohydride
Preparation of Sodium Triacetoxyborohydride. Preparation
from sodium borohydride in situ prior to reduction is
our preferred method. To NaBH4 (74 mg), suspended in ethyl
acetate (15 mL) and cooled with an ice-water bath, was added
glacial acetic acid (3.05 equiv) by syringe over approx. 5 min. Stirring
was continued for another 5 min until a clear solution was
formed. The solution [...]
In: Uncategorized · Tagged with: mild reducing agent, reduction reaction, sodium borohydride, Sodium Triacetoxyborohydride
Too busy to write!
Hi Friends,
I am getting quite busy with my schedule, which is the reason I am not getting time to write my experiments. I will try to write them as soon as possible. Don’t worry I have them jotted down in my notes, but just not on the mahine. I will hopefully [...]