Butylbenzoic acid ester

To a round flask which has been well dried and flushed with nitrogen are added 85.0 g (1.1 mol) of sodium amide (50% suspension in toluene) and 180.0 g of isopropyl ether and there are now added dropwise thereto at a temperature of 50°-60°C 150.2 g (1 mol) of acetylanisole in 180.0 g of isopropyl ether. Reaction sets in immediately and a white paste-like mass forms. After completion of the addition, the mixture is stirred for a further 0.5 h and then 192.3 g of p-t-butylbenzoic acid methyl ester are added rapidly at 25°-30°C. The mixture is stirred for 0.5 h at room temperature, then for 3 h at 60°-70°C and left to stand for 12 h. 200.0 g of ice are then added and the mixture is acidified with 128.0 g (1.1 mol) of technical hydrochloric acid and 200 ml of ice-water. The mixture is stirred until the sodium salt of the product has dissolved. The phases are separated and the organic phase is washed with ice-water until neutral. The organic phase is concentrated on a rotary evaporator and there are thus recovered 290.0 g of isopropyl ether. The yield of 4-(l,l-dimethylethyl)-4 -methoxydibenzoylmethane, melting point 83.5°C is 199.8 g (64.5%) (recrystallisation from methanol). 

Side products from the conversion of 1,2-DPTE (4) on BDD electrodes were found to be p-ferf-butylbenzyl methyl ether (7%) and />-tert-butylbenzoic acid methyl ester (6%). 

It has been shown that the efficiency of esters of 4-hydroxy-3,5-di-f-butylbenzoic acid as light stabilizers for polyolefins is not related to the yield of the photo-Fries rearrangement [132]... 

Nucleating agents may improve stiffness of the rotomolded part." The following nucleating agents are suggested 4-tert-butylbenzoic acid adipic acid diphenylacetic acid sodium salt of methylene bis-2,4-dibutylphenyl cyclic phosphate esters sorbitol tris-ben-zaldehyde acetal and sodium salt of bis(2,4-di-t-butylphenyl) phosphate or Na salt of eth-ylidene bis(2,4-di-t-butyl phenyl)phosphate." ... 

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