The distribution of functionality types in hydroxyoligobutadienes obtained in hydrocarbon media under the action of di-secondary dilithium alkanes

It was found that hydroxyoligobutadienes obtained in hydrocarbon solvents via reactions initiated by di-secondary dilithium alkanes contain, in addition to the target bifunctional fraction, the mono- and trifunctional fractions and a branched bifunctional function. It was established that a distribution of the functionality types is formed in the initial stage of the degree of the process. It is demonstrated that the degree of molecular homogeneity of the oligomers can be increased (with the bifunctional fraction reaching up 90 % and above) by conducting the process in two stages. An insoluble 'living' oligomer, enriched by the bifunctional fraction, is isolated in the first stage and used as a 'secondary initiator' in the second stage. 19 refs., 4 figs., 1 tab