(3-hydroxy-2,2-dimethylpropyl) 3-hydroxy-2,2-dimethylpropanoate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 120 g (1.18 mol) of triethylamine were added with vigorous stirring under reflux to a hot mixture at 50° C. of 975 g (12 mol) of 37% strength formaldehyde solution and 865 g (12 mol) of isobutyraldehyde, and the mixture was allowed to rise to 92° to 94° C. in the course of 10 minutes. Triethylamine and water were then distilled off at from 150 to 30 mbar in the course of from 15 to 20 minutes and at a maximum bottom of column temperature of from 70° to 75° C. The remaining mixture was then heated under atmospheric pressure to 160° C. in the course of 15 minutes, during which, essentially, further residues of water came off, and was stirred at that temperature for a further 160 minutes. Distillation of the mixture gave 180 g of a fraction of boiling range 80°-95° C. at 8-10 mbar, which contained 119 g (1.17 mol) of hydroxypivalinaldehyde, corresponding to 9.75%, based on the starting materials. This left a residue of 305 g which, according to analysis by gas chromatography, comprised 96% (869 g; 4.26 mol) of 2,2-dimethylpropane-1,3-diol hydroxypivalate, corresponding to a 71% yield, based on the starting materials (overall selectivity 80.75%). The residue was taken up in 1,100 ml of methanol, 15 g (0.28 mol) of sodium methanolate were added, and the mixture was stirred at room temperature for 15 hours. Neutralization with acetic acid and fractional distillation gave 496.5 g (3.76 mol) of methyl hydroxypivalate, corresponding to 88.34% yield, based on esterdiol III, and also 375.4 g (3.68 mol) of 2,2-dimethyl-1,3-propanediol, corresponding to an 86.4% yield. to rise to 92° to 94° C. in the course of 10 minutes Triethylamine and water were then distilled off at from 150 to 30 mbar in the course of from 15 to 20 minutes of from 70° to 75° C The remaining mixture was then heated under atmospheric pressure to 160° C. in the course of 15 minutes, during which was stirred at that temperature for a further 160 minutes Distillation of the mixture gave 180 g of a fraction of boiling range 80°-95° C. at 8-10 mbar, which This left a residue of 305 g which the mixture was stirred at room temperature for 15 hours Neutralization with acetic acid and fractional distillation

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 101 g (1.25 mol) of 37% strength aqueous formaldehyde solution and 99 g (1.37 mol) of isobutyraldehyde were mixed at 40° C. under nitrogen with 4.2 g (0.03 mol) of 40% strength aqueous trimethylamine solution by stirring. The temperature of the mixture rose to 93° to 94° in the course of from 15 to 20 minutes. The mixture was stirred at that temperature for a further 10 minutes, and the trimethylamine, excess isobutyraldehyde and 58 g of water were then distilled off under reduced pressure. The remaining solution of hydroxypivalinaldehyde was then cooled down to 60° C., and 1.9 g (0.025 mol) of finely pulverulent calcium hydroxide were then added with vigorous stirring. After the exothermic reaction had ceased and a further, short period of stirring, 2.5 g (0.054 mol) of 100% strength formic acid were added at 70° C., and the mixture was stirred 70° C. for 10 minutes. The aqueous phase was then separated off, and the organic phase was subjected to fractional distillation. 110 g (0.54 mol) were isolated of 2,2-dimethyl-1,3-propanediol hydroxypivalate, corresponding to 86.5% of theory, based on starting formaldehyde. rose to 93° to 94° in the course of from 15 to 20 minutes The mixture was stirred at that temperature for a further 10 minutes the trimethylamine, excess isobutyraldehyde and 58 g of water were then distilled off under reduced pressure 1.9 g (0.025 mol) of finely pulverulent calcium hydroxide were then added with vigorous stirring After the exothermic reaction a further, short period of stirring the mixture was stirred 70° C. for 10 minutes The aqueous phase was then separated off the organic phase was subjected to fractional distillation