Xanthogen disulphides, their production and the use thereof...

C - Chemistry – Metallurgy – 07 – D

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260/466.4, 260/3

C07D 317/30 (2006.01) C07D 319/06 (2006.01) C08F 36/18 (2006.01)

Patent

CA 1176264

Abstract of the Disclosure Xanthogon disulphides of the following formula: Image wherein R and R1 independently represent hydrogen, C1-C6 alkyl, C5-C8-cycloalkyl or an oxygen-containing hetero- cyclic ring system having from 5 to 8 ring members and optionally mono- or tri-substituted by C1-C4-alkyl, and wherein R and R1 may also be connected together to complete a hetero cyclic ring having from 3 to 6 carbon atoms and from 1 to 3 oxygen ring members, and the ring may be substituted by from 1 to 3 C1-C4-alkyl groups, with a content of elemental sulphur of legs than 1.7 % by weight, a process for their production by the reaction of a xanthic acid-O-ester-alkali metal salt of the following formula: Image wherein R and R1 are as defined in Claims 1 and 3, and M represents an alkali metal, with aqueous chlorine bleach liquor, characterised in that aqueous chlorine bleach liquor having a concen- tration of less than 0.9 mol NaOCl/kg is used, and oxidation is carried out at a temperature of from 10 to 20°C and at a pH of from 8 to 12, only until from 0.1 to 5.0 mol % of the xanthic acid-O-ester-alkali metal salt, based on the quantity used, is still present at the end of the reaction, as well as their use as molecular weight regulators in the polymeri- sation of chloroprene.

390972

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