Disclosed herein are methods of purifying compounds useful for the deposition of high purity tin oxide and high purity compounds purified by those methods. Such compounds are those of the Formula as follows Rx—Sn-A4-x,
wherein:




A is selected from the group consisting of (YaR′z) and a 3- to 7-membered N-containing heterocyclic group;
each R group is independently selected from the group consisting of an alkyl or aryl group having from 1 to 10 carbon atoms;
each R′ group is independently selected from the group consisting of an alkyl, acyl or aryl group having from 1 to 10 carbon atoms;
x is an integer from 0 to 4;
a is an integer from 0 to 1;
Y is selected from the group consisting of N, O, S, and P; and
z is 1 when Y is O, S or when Y is absent and z is 2 when Y is N or P.