(5-ethyl-1,3-dioxan-5-yl)methanol

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

Procedure: In a one-liter three neck flask were placed 405 grams of 2-ethyl-2-hydroxymethyl-1,3-propanediol, 90 grams of paraformaldehyde, 0.9 grams of p-toluene sulfonic acid monohydrate and 150 ml of toluene. The flask was equipped with a Dean-stark trap and a condenser. The reaction mixture was stirred at a bath temperature of 120° C. to 170° C. for three hours. The toluene-water was collected, and after removing the toluene, the crude product was distilled under vacuum at 10-11 mm Hg and 115° C. to 117° C. 410 grams of 5-ethyl-5-hydroxymethyl-1,3-dioxane (EHMDO) were collected. The product was then dried by molecular sieve and had a water content of about 350 ppm. NMR spectra confirmed that EHMDO was obtained. The flask was equipped with a Dean-stark trap and a condenser The toluene-water was collected after removing the toluene the crude product was distilled under vacuum at 10-11 mm Hg and 115° C. to 117° C 410 grams of 5-ethyl-5-hydroxymethyl-1,3-dioxane (EHMDO) were collected The product was then dried by molecular sieve was obtained

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

Procedure: In a one-liter three neck flask were placed 405 grams of 2-ethyl-2-hydroxymethyl-1,3-propanediol, 90 grams of paraformaldehyde, 0.9 grams of p-toluene sulfonic acid monohydrate and 150 ml of toluene. The flask was equipped with a Dean-stark trap and a condenser. The reaction mixture was stirred at a bath temperature of 120° C. to 170° C. for three hours. The toluene-water was collected, and after removing the toluene, the crude product was distilled under vacuum at 10-11 mm Hg and 115° C. to 117° C. 410 grams of 5-ethyl-5-hydroxymethyl-1,3-dioxane (EHMDO) were collected. The product was then dried by molecular sieve and had a water content of about 350 ppm. NMR spectra confirmed that EHMDO was obtained. The flask was equipped with a Dean-stark trap and a condenser The toluene-water was collected after removing the toluene the crude product was distilled under vacuum at 10-11 mm Hg and 115° C. to 117° C 410 grams of 5-ethyl-5-hydroxymethyl-1,3-dioxane (EHMDO) were collected The product was then dried by molecular sieve was obtained