IP Library › Granted Patent US 6,852,873
Granted Patent B2
US 6,852,873 · App. 10/223,547 · Granted Feb 8, 2005

Preparation of styryl dyes

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Quick Facts
Patent No.
US 6,852,873
App. No.
10/223,547
Granted
Feb 8, 2005
Kind
B2
Abstract

Process for preparing compounds of the formula (I) where R 1 , R 2 and R 3 are independently hydrogen, alkyl or cycloalkyl, characterized in that an aldehyde of the formula (II) is reacted with CH 2 (CN) 2 in the presence of butanol.

Claims (12)

1. Process for preparing compounds of the formula (I)

where

R 1 , R 2 and R 3 are independently hydrogen, alkyl or cycloalkyl, comprising

reacting an aldehyde of the formula (II)

with CH 2 (CN) 2 in the presence of butanol.

2. Process according to claim 1 , wherein

R 1 is cycloalkyl,

R 2 is hydrogen, and

R 3 is C 1 -C 6 -alkyl.

3. Process according to claim 2 wherein R 1 is C 5 -C 7 cycloalkyl.

4. Process according to claim 3 wherein R 1 is cyclohexyl.

5. Process according to claim 2 wherein R 3 is ethyl.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 1, 2006
From: BAYER AG
To: LANXESS DEUTSCHLAND GMBH
Reel/Frame 018584/0319 →