Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List 3,5-Bis(2-cyanoprop-2-yl)toluene
120511-72-0

3,5-Bis(2-cyanoprop-2-yl)toluene synthesis

7synthesis methods
5-Methyl-1,3-benzenediacetonitrile

120511-74-2

Iodomethane

74-88-4

3,5-Bis(2-cyanoprop-2-yl)toluene

120511-72-0

General procedure for the synthesis of 5,α,α,α,α',α'-pentamethyl-1,3-benzenediacetonitrile from 2,2'-(5-methyl-1,3-phenylene)bisacetonitrile and iodomethane: A mixture of 3,5-bis(cyano-methyl)toluene (800 g, 4.70 mol), methyl iodide (2,935.2 g, 20.68 mol) and dimethylformamide (11.20 L) was was cooled to 0°C to 5°C. A dispersion of 60% sodium hydride in mineral oil (864.2 g, 36.0 mol) was added in batches over 1 to 1.5 hours. Subsequently, the reaction mixture was gradually warmed to room temperature and stirred continuously for 2 to 2.5 hours. The progress of the reaction was monitored by thin layer chromatography (TLC, unfolding agent was hexane: ethyl acetate = 7.5:2.5). After confirming the completion of the reaction, ethyl acetate was added to quench the excess sodium hydride. The reaction mixture was diluted with water and extracted with dichloromethane (3 x 5 L). The organic phase was combined and washed with brine (5 L). The organic phase was decolorized with activated charcoal for 1 h at room temperature and subsequently concentrated to dryness under reduced pressure at 40°C to 45°C. The resulting residue was dissolved in carbon tetrachloride (2400 mL) at 70°C to 75°C and gradually cooled to 10°C to 15°C with stirring for 1 hour. The solution was further cooled to -5°C to 0°C and stirring was continued for 3 hours. Finally, the stirred suspension was filtered, the filter cake was washed with pre-cooled carbon tetrachloride (500 mL) and dried under vacuum at 40 °C to 45 °C to give 3,5-bis(1-cyano-1-methylethyl)toluene (748.0 g, 70.3% yield).

-

Yield:120511-72-0 79%

Reaction Conditions:

with sodium hydride

Steps:


Preparation of 2,2 '-(5-methyl-1,3-phenylene)di(2-methylpropionitrile) 2Compound 2, 2,2'-(5-methyl-l,3-phenylene)di(2-methylpropionitrile), can be prepared according to the procedure in example 1 of patent EP 0296749 Bl, which is hereby incorporated by reference in its entirety, but in particular in respect of thepreparation of 2,2'-(5-methyl-l,3-phenylene)di(2-methylpropionitrile) 2. Yield: 79%. Melting point: 125-127°C.

References:

GENERICS [UK] LIMITED WO2006/836, 2006, A1 Location in patent:Page/Page column 2; 9-10; 14; Figure 2

FullText

3,5-Bis(2-cyanoprop-2-yl)toluene Related Search: