Bayer Aktiengesellschaft

Saltigo Gmbh

Witold Broda

Luc J Vanmaele

Alexander Klausener

Heinz Landscheidt

Lars Rodefeld

Antje Hieronymi

Joachim Sommer

Joachim Westen

Hartmut Richter

Andreas Martin

Antje Steinhaus

What is described is a process for brominating alkylthiophene, in which an alkylthiophene of the general formula (I) whereR is a branched or unbranched alkyl radical having 1 to 12 carbon atomsis contacted with stoichiometric amounts of HBr and HO, optionally in the presence of a solvent.

Process for brominating alkylthiophenes

A process is described for preparing alkyl thiodiglycolates of the general formula (I)R&#x2014;OOC&#x2014;CH2-S&#x2014;CH2-COO&#x2014;R&#x2003;&#x2003;(I)where R is a radical of branched or unbranched Cto C-alkyl,

Process for preparing dialkyl thiodiglycolates

A process for preparing specific 1-substituted 5-hydroxy-imidazoline-2,4-diones by reacting glyoxylic acid with N-substituted ureas is provided, where this process is carried out in a 10-80% strength aqueous solution and in the presence of an acid catalyst. The 1-substituted 5-hydroxy-imidazoline-2,4-diones can subsequently be converted in a further reaction step to give 1-substituted 5-alkoxy-imidazoline-2,4-diones.

Process for preparing 1-substituted 5-hydroxy-imidazoline-2,4-diones and 1-substituted 5-alkoxy-imidazoline-2,4-diones

Substituted chloroaromatics are obtained in a simple manner in virtually isomer-free form when substituted phenols of the formula (II) ##STR1## where R.sup.1 to R.sup.5 are each, independently of one another, hydrogen, C.sub.1 -C.sub.10 -alkyl, unsubstituted or substituted C.sub.6 -C.sub.10 -aryl or halogen, with at least one of these radicals being different from hydrogen, are reacted with dichlorotriphenylphosphorus.

Process for preparing substituted chloroaromatics

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Neunkirchen-Seelscheid, Germany

Witold Broda