Synthesis of combinatorial libraries

In a process for synthesizing a combinatorial library of compounds in a plurality of reaction vessels, wherein for each step of the synthesis each of the plurality of reaction vessels is subject to unique reaction conditions such that different compounds of the library are produced by said unique reaction conditions, said library exhibiting a minimum variance in distribution of products in each vessel, which comprises the steps of(1) partitioning a set of particles into a first group of reaction vessels wherein each reaction vessel is subject to a unique set of reaction conditions, (2) repartitioning the treated particles into a second group of reaction vessels wherein each reaction vessel is again subject to a unique set of reaction conditions, and (3) repeating step (2) at least once, wherein the improvement comprises repartitioning the treated particles by directly dividing the contents of each reaction vessel into each of the succeeding reaction vessels for every step in said process, whereby the number of reaction vessels is the same as the number of unique reaction conditions at each step.