Short oligodeoxyribonucleotides have been assembled from appropriately protected nucleoside 3-(benzotriazol-1-yl 2-chlorophenyl phosphate) derivatives on hundred-milligram scales on a soluble tetrakis-O-(4-azidomethylphenyl)pentaerythritol support bearing four 3-O-(4-pentynoyl)thymidines. Small-molecule reagents and waste were removed by two precipitations of the support-bound growing oligonucleotides with methanol, the first after removal of the 5-protecting group and the second after coupling. The building blocks were obtained by one-step phosphorylation of commercially available protected nucleosides with bis(benzotriazol-1-yl) 2-chlorophenyl phosphate. Removal of the phosphate protecting groups from the completed chain with (E)-2-nitrobenzaldoxime followed by conventional ammonolysis allowed precipitation of the oligonucleotide as the sodium salt with ethanol.