Boron trifluoride → HCID 20213781, compound

Participants

Reaction Conditions

Reaction Steps

The diketodiols and diketodiesters of the formula ##STR8## where X is methyl or chlorine, Ar is m- or p-phenylene and R is hydrogen or hydrocarbyl of from 1-10 carbon atoms are prepared by reacting, under anhydrous conditions, a disubstituted monophenol, such as 2,6-dimethyl- or 2,6-dichlorophenol with terephthalic (for Ar=p-phenylene) or isophthalic (for Ar=m-phenylene) acid (or its diester) or hydrogen fluoride in the presence of boron trifluoride. The reaction is allowed to proceed to about 0° to about 100° C. For example, terephthalic acid (83 g) and 2,6-dimethylphenol (122 g) are charged to a 1 liter Hastalloy C® shaker tube. The tube was cooled and then charged with hydrogen fluoride (400 g) and boron trifluoride (150 g). It was warmed to 50° C., shaken at 50° C. for 4 hr, then cooled and vented. The contents, a dark red solid in a dark red solution, were allowed to evaporate in the hood to afford crude 1,4-bis(3,5-dimethyl-4-hydroxybenzoyl)benzene as a dark red solid. This material was stirred with 2 l. of water, warmed and isolated by filtration of the warm mixture. It was again stirred with 2 l. of water, warmed, neutralized with sodium bicarbonate, and isolated by filtration of the warm mixture. After being washed with water and air dried, the product was obtained as a tan powder in a yield of 79%.

Provenance & Evidence