A process for the preparation of indanones of the formula II from indanones of the formula I or of indanones of the formula IIa from indanones of the formula Ia ##STR1##

comprises reacting an indanone of the formula I or Ia with a coupling component.

 
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> High temperature elastomers from linear poly (silarylene-siloxane-acetylene)

> Alkylation process with efficient effluent refrigeration
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