Procedure for the manufacture of substitute blues (Machine-translation by Google Translate, not legally binding)

摘要

Process for the manufacture of substituted azulenes, characterized in that a azulene alkylated in position 4, 8 or 6, in which the carbon atom α of the alkyl moiety has at least one H atom and in which the other positions of the bicyclic system can be replaced by indifferent groups, it is treated with a metal-yielding combination, and the resulting alkylidene-azulenate salt is then reacted with an electrophilic combination. (Machine-translation by Google Translate, not legally binding)