2-butan-2-yl-2-methylpropane-1,3-diol

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637).

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637). to rise up to about 80° C. due to the exothermic reaction After the addition The organic phases was separated fractionally distilled

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637). to rise up to about 80° C. due to the exothermic reaction After the addition The organic phases was separated fractionally distilled

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: A 3-necked round bottom flask (250 ml capacity) was fitted with a mechanical stirrer, thermometer and Dean and Stark apparatus, the latter was equipped with a double surface water condenser. Privetal (0.1 mole, 14.6 g) and 2-methyl-2-sec.butylpropane-1,3 diol (0.1 mole 14.6 g) were charged into the flask together with cyclohexane (50 ml) as solvent and a catalytic amount of p-toluenesulphonic acid (0.35 g). Privetal was a mixture of 2,4-dimethyl-and 3,5-dimethyl-cyclohex-3-ene-1-carboxaldehyde obtained from PPF International, Ashford, England; now obtained under the trade name Ligustral from Quest International, Ashford, Kent the successor company to PPF International. (The 1,3-diol was obtained from Hoechst GmbH of West Germany.) A 3-necked round bottom flask (250 ml capacity) was fitted with a mechanical stirrer thermometer and Dean and Stark apparatus, the latter was equipped with a double surface water condenser

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

Procedure: 50 g. of 2,3-dimethyl-pent-4en-aldehyde is added to 100 ml. of 37% formaldehyde in a 250 ml. round bottom flask. 70 g. of a 50% w/w solution of sodium hydroxide is dripped into the mixture with stirring and the temperature maintained at 35°-40° C. with an ice bath. When the addition is complete the mixture is stirred one-half hour at room temperature and the two layers separated. The aqueous layer is extracted with 75 ml. ethyl acetate and the extract combined with the organic layer. The organic layer is washed twice with 100 ml. of water. The organic layer is placed in a Parr hydrogenation bottle and diluted to 150 ml. with methanol. 1 g. wet Raney Nickle catalyst is added and the mixture reduced at 50 p.s.i. until no more hydrogen is absorbed. The catalyst is removed by filtration and the filtrate concentrated and distilled. A yield of 45.4 g. of 2-methyl-2(sec butyl)-1,3-propanediol BP 139°-140° C. at 10 mm. pressure and refractive index ND22 =1.4610 is obtained. the temperature maintained at 35°-40° C. with an ice bath When the addition is stirred one-half hour at room temperature the two layers separated The aqueous layer is extracted with 75 ml The organic layer is washed twice with 100 ml diluted to 150 ml wet Raney Nickle catalyst is added until no more hydrogen is absorbed The catalyst is removed by filtration the filtrate concentrated distilled pressure and refractive index ND22 =1.4610 is obtained

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

Procedure: I have now found a novel method for producing mebutamate diol which includes the process steps of reacting crotyl alcohol and allyl chloride to produce a mixture of isomers of allyl crotyl ether, heating said crotyl ether to produce 2,3-dimethyl-pent-4en-aldehye. The aldehyde is then converted to 2-methyl-2-(sec butyl)-1, 3-propanediol by reacting 2,3-dimethyl-pent-4en-aldehyde and formaldehyde to produce 2,3-dimethyl-2-hydroxymethyl-pent-4en-ol and subsequently hydrogenating the said alcohol in the presence of a catalyst to produce 2-methyl-2-(sec butyl)-1,3-propanediol.

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

Procedure: An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637).

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637). to rise up to about 80° C. due to the exothermic reaction After the addition The organic phases was separated fractionally distilled