Process for the preparation of dibromoneopentylglycol (DBNG)

Details Process for the preparation of dibromoneopentylglycol (DBNG) Process for the preparation of dibromoneopentylglycol (DBNG)

1977-11-23

1979-05-15

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 3134

Patent

active

041549660

ABSTRACT:
The present invention relates to a process for the preparation of 2,2-bis-(bromomethyl)-1,3-propanediol comprising reacting pentaerythritol with HBr in the presence of 0.5-4% calculated on the weight of said pentaerythritol of a catalyst selected among the group comprising carboxylic acids, their anhydrides and esters, in an inert solvent being selected from the group comprising aromatic hydrocarbons and aromatic and aliphatic halohydrocarbons having a boiling point between 80-145.degree. C., removing the water simultaneously in the form of a HBr solution, and thereafter adding a neutralizing agent.
2,2-bis-(bromomethyl)-1,3-propanediol is utilized as reactive component in fire retardant polyesters and polyurethanes.

REFERENCES:
patent: 3876509 (1975-04-01), Davis et al.
patent: 3883581 (1975-05-01), Davis et al.
patent: 3932541 (1976-01-01), Davis et al.

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