C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/236.18
C09B 5/02 (2006.01) C09B 3/36 (2006.01) D06P 1/22 (2006.01)
Patent
CA 1120472
ABSTRACT OF THE DISCLOSURE A process for which the production of vat dyes of the formula Image (1) , wherein R is an alkylene radical of 1 to 6 carbon atoms which can be substituted by halogen, hydroxy or phenyl, an alkenylene radical of 1 to 6 carbon atoms or a phenly- lene radical, and the radical R can form 1 to 3 ring members between the two oxygen atoms, which process com- prises reacting the compound of the formula Image (2) , in aprotic dipolar solvents selected from the group con- sisting of sulpholane, N-methyl-2-pyrrolidone, hexamethyl- phosphoric triamide, dimethyl sulphoxide, dimethyl forma- mide, dimethyl acetamide,diethyl acetamide, acetonitrile and tetramethyl urea, with compounds of the formula X - R - X (3), wherein X is halogen and R is as defined in formula (l), in the presence of bases, at elevated temperature.
307288
Ciba Specialty Chemicals Holding Inc.
Gowling Lafleur Henderson Llp
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