ORGLIST: Pyridine-SO3 complex

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From: JosÚ Barros (zerozero43$##$yahoo.com.br)
Date: Tue Dec 14 2004 - 10:51:28 EST


Dear Chen,

There are 2 methods to make Pyridine-SO3 complex in
Fieser:

(a) Pyridine (1 mol) is slowly dropped with cooling
and stirring into a mixture of crushed sulfur trioxide
(1 mol) and carbon tetrachloride (4 parts), and the
cristalline product is colected and washed with ice
water to remove a trace of pyridine-H2SO4.

(b) chlorosulfonic acid (0.5 mol) is dropped with
cooling and stirring into a solution of pyridine (1
mol) in carbon tetrachloride; the product is washed
with ice water to remoev pyridine hydrochloride.

     2 C2H5N + ClSO3H -> C5H5N.SO3 + C5H5N+HCl-

Method (b) can be carried out with 6.17g of pyridine
and 4.51 g of chlorosulfonic acid in 15 mL of carbon
tetrachloride.

Best regards
J.C. BARROS

        
        
                
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