3,3′,4,4′-tetraalkyl cyclohexylbenzene and method for producing same

Patent metadata

Field	Value
Publication number	US-9522857-B2
Application number	US-201214118190-A
Country	US
Kind code	B2
Filing date	May 18, 2012
Priority date	May 18, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A 3,3′,4,4′-tetraalkyl cyclohexylbenzene represented by the general formula (1):

in which R represents an alkyl group having 1 to 4 carbon atoms, which may be easily converted into a 3,3′,4,4′-biphenyltetracarboxylic acid and a 3,3′,4,4′-biphenyltetracarboxylic dianhydride thereof, which are starting materials for a polyimide, via a 3,3′,4,4′-tetraalkylbiphenyl; and a method for producing the same.

First claim

The invention claimed is:

1. A method comprising:
reacting an o-dialkylbenzene represented by the general formula (2):

wherein R represents an alkyl group having 1 to 4 carbon atoms, with hydrogen in the presence of a catalyst containing at least one selected from the group consisting of palladium and ruthenium, and a solid acid catalyst containing a lanthanoid metal to perform a hydroalkylation of the o-dialkylbenzene, thereby producing a 3,3′,4,4′-tetraalkyl cyclohexylbenzene represented by the general formula (1):

wherein R is defined as above.

Assignees

• Yamamoto Yasushi
• Yatabe Hikaru
• Ube Industries

Inventors

• Yamamoto Yasushi
• Yatabe Hikaru

Classifications

• B01J23/44 Primary

  Palladium · CPC title

• C07C2523/63

  with rare earths or actinides · CPC title

• C07C2101/14

  Chemistry & Metallurgy · mapped topic

• C07C2529/18

  of the mordenite type · CPC title

• C07C2521/18

  Carbon · CPC title