Preparation of dimethylbutan, Chemistry

Preparation of dimethylbutan:

Procedure:

Prepare a mixture of 3,3-dimethylbutan-2-one (trivial name pinacolone; 20.0 g, 0.200 moles), redistilled benzaldehyde (24.0 g, 0.226 moles; see Note 1 if you need to redistil it yourself), 95% ethanol ( ‘rectified spirit'; 75 mL), water (26 mL) and 10% aqueous sodium hydroxide solution (20 mL) in a 500 mL round-bottomed flask equipped with a stirrer guide and overhead mechanical stirrer.

Stir for 6 hours at ambient temperature (this is important).

Dilute with an equal volume of water, and extract the organic product with three separate portions of diethyl ether (60 mL) using an appropriately sized separating funnel. Wash the combined ethereal extracts with water (4 x 60 mL; Note 3), then dry over anhydrous magnesium sulphate (Note 4).

Remove the desiccant by filtration (fluted filter paper, gravity) and the solvent by rotary evaporation over a water-bath using a tared RB flask (Note 5). Determine the mass of the crude product (Note 6).

It is critically important that you do the following distillation carefully: any residual starting materials will interfere with the next step in the reaction.

Purify your product by distillation under reduced pressure, using an efficient water-pump (Notes 7 and 8). Collect the lowish-boiling fore-run in receiver flask 1, and the constant-boiling pure product in receiver flask 2, over a temperature range of no more than 20.(See Note 6.) Record the bp/pressure at which the product distils, record its mass and calculate your percentage yield. Run a IR spectrum of your different fractions and check the purity of your product (marks will be awarded for purity and it will be worth repeating the distillation if your sample is contaminated).

Posted Date: 2/11/2013 6:27:32 AM | Location : United States







Related Discussions:- Preparation of dimethylbutan, Assignment Help, Ask Question on Preparation of dimethylbutan, Get Answer, Expert's Help, Preparation of dimethylbutan Discussions

Write discussion on Preparation of dimethylbutan
Your posts are moderated
Related Questions
The abstraction of a hydrogen atom The H-CN bond is stronger than the O-H bond, the abstraction of a hydrogen atom from HCN by the tert-butoxy radical is endothermic by 528 - 4

In 2008, Safeway has converted all its trucks to bio-diesel B20 which is a mixture of 20% of bio-diesel produced from soybean and 80% of diesel in volume. It claimed that 34,000 to

Marine lipids Marine lipids originate from the liver of lean white fish such as cod, the body of oily fish such as mackerel, and the blubber of marine mammals such as seal.  T



Determination of oxalate in copper complex

what do you know about the dynamic nature of chemical equilibrium?

Chemotherapy - chemistry in action The phrase chemotherapy that literally means chemical therapy or chemical treatment was coined in the year 1913 by Paul Ehrlich, the father o

graph for the titration of barium chloride versus sodium sulphate

1.  Consider a platinum crystal structure (FCC, R Pt = .139 nm). a.  Sketch the (100), (110), and (111) planes (including the atoms in the second layer if they can be observed