This preparation describes the production of a tertiary alcohol
from a Grignard reagent and a ketone. The reaction is performed
in a reflux apparatus which has a calcium chloride guard tube
inserted in the top of - Place a 250 cm3 three-necked round-
bottomed flask, a double-surface water condenser, a tap funnel
and a guard tube containing anhydrous calcium chloride in an
oven at 120oC for an hour or - What is a double-surface
condenser, and why is it needed? - A double-surface condenser
has a water jacket both on the outside and through the centre of
the condensing tube. It is needed where, as here, the condensed
liquid is very volatile. - What is the purpose of the guard
tube? - The guard tube prevents water vapour from entering the
apparatus from - Why is the apparatus and the reagents dried? -
Grignard reagents react easily with water. Any moisture present
will prevent the reaction from occurring. - Allow the apparatus
to cool, and assemble it as a refluxing apparatus with the guard
tube in the top of the