Dithiocarbamic esters
View Patent ↗The present invention relates to dithiocarbamic esters, their preparation and their use for regulating the degree of polymerization during the polymerization of monomers, such as during the polymerization of chloroprene to give polychloroprene, and during the polymerization of 2,3-dichlorobutadiene to give poly-2,3-dichlorobutadiene, and during the copolymerization of chloroprene with 2,3-dichlorobutadiene. The present invention further relates to polymers which are obtainable via the polymerization of monomers in the presence of the dithiocarbamic esters of the invention. The present invention also relates to polymers which contain end groups derived from the dithiocarbamic esters of the present invention.
1. A compound of the formula (I),
where
R is a halogen-substituted alkenyl radical,
and where
Z is a substituted or unsubstituted pyrrole, which has linkage at the nitrogen atom of said pyrrole to the —CS 2 —R group.
2. A process for preparing the compound of the formula (I) according to claim 1 , comprising
a) providing a compound of the formula (IV),
where Z is as defined in claim 1 and M is an alkali metal,
b) reacting this compound with a compound of the formula (V)
R—X (V),
where R is as defined in claim 1 and X is Cl, Br or I.