diethyl 2,2-bis(6-hydroxy-5,5-dimethylhexyl)propanedioate

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

Procedure: To a stirred solution of KOH (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (15 g). The reaction mixture was heated to reflux for 14 h, then concentrated in vacuo, and extracted with chloroform. The aqueous layer was acidified with HCl until pH 1 and extracted with diethyl ether (3×50 mL). The ethereal solution was dried over anhydrous MgSO4 and concentrated in vacuo to afford get 2,2-bis-(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid (7.8 g, 82.3%) as a yellow solid. 1H NMR (300 MHz, CD3OD/TMS): (ppm) 4.86 (s, 4 H), 3.22 (s, 4 H), 1.9-1.8 (m, 4 H), 1.36-1.10 (m, 12 H), 0.84 (s, 12 H). 13C NMR (75 MHz, CD3OD/TMS): (ppm) 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. Mp.: 178-180 C. The reaction mixture was heated to reflux for 14 h concentrated in vacuo extracted with chloroform extracted with diethyl ether (3×50 mL) The ethereal solution was dried over anhydrous MgSO4 concentrated in vacuo to afford

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

Procedure: A solution of 2,2-bis-[5,5-dimethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5 mmol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4 H), 3.25 (s, 4 H), 2.42 (s, 2 H), 1.90-1.75 (m, 4 H), 1.30-1.12 (m, 18 H), 0.84 (s, 12 H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: To a stirred solution of KOH (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (15 g). The reaction mixture was heated to reflux for 14 h, then concentrated in vacuo, and extracted with chloroform. The aqueous layer was acidified with HCl until pH 1 and extracted with diethyl ether (3×50 mL). The ethereal solution was dried over anhydrous MgSO4 and concentrated in vacuo to afford get 2,2-bis-(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid (7.8 g, 82.3%) as a yellow solid. 1H NMR (300 MHz, CD3OD/TMS): (ppm) 4.86 (s, 4H), 3.22 (s, 4H), 1.9-1.8 (m, 4H), 1.36-1.10 (m, 12H), 0.84 (s, 12H). 13C NMR (75 MHz, CD3OD/TMS): (ppm) 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. Mp.: 178-180 C. The reaction mixture was heated to reflux for 14 h concentrated in vacuo extracted with chloroform extracted with diethyl ether (3×50 mL) The ethereal solution was dried over anhydrous MgSO4 concentrated in vacuo to afford

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

Procedure: A solution of 2,2-bis-[5,5-dimethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5mmol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4H), 3.25 (s, 4H), 2.42 (s, 2H), 1.90-1.75 (m, 4H), 1.30-1.12 (m, 18H), 0.84 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: To a stirred solution of KOH (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (15 g). The reaction mixture was heated to reflux for 14 h, then concentrated in vacuo, and extracted with chloroform. The aqueous layer was acidified with HCl until pH 1 and extracted with diethyl ether (3×50 mL). The ethereal solution was dried over anhydrous MgSO4 and concentrated in vacuo to afford get 2,2-bis-(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid (7.8 g, 82.3%) as a yellow solid. 1HNMR (300 MHz, CD3OD/TMS): (ppm) 4.86 (s, 4H), 3.22 (s, 4H), 1.9-1.8 (m, 4H), 1.36-1.10 (m, 12H), 0.84 (s, 12H). 13C NMR (75 MHz, CD3OD/TMS): (ppm) 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. Mp.: 178-180 C. The reaction mixture was heated to reflux for 14 h concentrated in vacuo extracted with chloroform extracted with diethyl ether (3×50 mL) The ethereal solution was dried over anhydrous MgSO4 concentrated in vacuo to afford

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

Procedure: A solution of 2,2-bis-[5,5-dimethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5 mmol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4H), 3.25 (s, 4H), 2.42 (s, 2H), 1.90-1.75 (m, 4H), 1.30-1.12 (m, 18H), 0.84 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: A solution of 2,2-bis-[5,5-dimethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5 mmol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4H), 3.25 (s, 4H), 2.42 (s, 2H), 1.90-1.75 (m, 4H), 1.30-1.12 (m, 18H), 0.84 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: To a stirred solution of KOH (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (15 g). The reaction mixture was heated to reflux for 14 h, then concentrated in vacuo, and extracted with chloroform. The aqueous layer was acidified with HCl until pH 1 and extracted with diethyl ether (3×50 mL). The ethereal solution was dried over anhydrous MgSO4 and concentrated in vacuo to afford get 2,2-bis-(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid (7.8 g, 82.3%) as a yellow solid. 1H NMR (300 MHz, CD3OD/TMS): (ppm) 4.86 (s, 4H), 3.22 (s, 4H), 1.9-1.8 (m, 4H), 1.36-1.10 (m, 12H), 0.84 (s, 12H). 13C NMR (75 MHz, CD3OD/TMS): (ppm) 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. Mp.: 178-180 C. The reaction mixture was heated to reflux for 14 h concentrated in vacuo extracted with chloroform extracted with diethyl ether (3×50 mL) The ethereal solution was dried over anhydrous MgSO4 concentrated in vacuo to afford

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

Procedure: A solution of 2,2-bis-[5,5-dimethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5 mmol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4H), 3.25 (s, 4H), 2.42 (s, 2H), 1.90-1.75 (m, 4H), 1.30-1.12 (m, 18H), 0.84 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: To a stirred solution of KOH (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (15 g). The reaction mixture was heated to reflux for 14 h, then concentrated in vacuo, and extracted with chloroform. The aqueous layer was acidified with HCl until pH 1 and extracted with diethyl ether (3×50 mL). The ethereal solution was dried over anhydrous MgSO4 and concentrated in vacuo to afford get 2,2-bis-(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid (7.8 g, 82.3%) as a yellow solid. 1H NMR (300 MHz, CD3OD/TMS): (ppm) 4.86 (s, 4H), 3.22 (s, 4H), 1.9-1.8 (m, 4H), 1.36-1.10 (m, 12H), 0.84 (s, 12H). 13C NMR (75 MHz, CD3OD/TMS): (ppm) 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. Mp.: 178-180 C. The reaction mixture was heated to reflux for 14 h concentrated in vacuo extracted with chloroform extracted with diethyl ether (3×50 mL) The ethereal solution was dried over anhydrous MgSO4 concentrated in vacuo to afford

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

Procedure: A solution of 2,2-bis-[5,5-diethyl-6-(tetrahydropyran-2-yloxy)-hexyl]-malonic acid diethyl ester (2.92 g, 5 mol) in concentrated HCl (2.4 mL) and water (1.6 mL) was refluxed for 1 h. Ethanol (8.2 mL) was added and the reaction mixture was heated to reflux for 3 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (3×20 mL). The combined organic layers were washed with water (20 mL), brine (20 mL), and dried over Na2SO4. The solution was concentrated to furnish 2,2-bis(6-hydroxy-5,5-dimethyl-hexyl)-malonic acid diethyl ester (1.74 g, 84%). 1H NMR (300 MHz, CDCl3/TMS): (ppm) 4.13 (q, J=7.2 Hz, 4H), 3.25 (s, 4H), 2.42 (s, 2H), 1.90-1.75 (m, 4H), 1.30-1.12 (m, 18H), 0.84 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): (ppm) 172.0, 71.7, 60.9, 57.4, 38.2, 34.9, 32.1, 24.8, 24.0, 23.7, 14.0. the reaction mixture was heated to reflux for 3 h extracted with diethyl ether (3×20 mL) The combined organic layers were washed with water (20 mL), brine (20 mL) dried over Na2SO4 The solution was concentrated

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

Procedure: To a stirred solution of potassium hydroxide (4.83 g, 75 mmol) in water (4.2 mL) and ethanol (15 mL) was added 2,2-bis(6-hydroxy-5,5-dimethylhexyl)malonic acid diethyl ester (15.0 g). The reaction mixture was heated at reflux for 14 h. The ethanol was removed under reduced pressure and the aqueous solution was extracted with chloroform (2×50 mL). The aqueous layer was acidified with hydrochloric acid to pH 1 and extracted with diethyl ether (3×50 mL). The ethereal phases were dried over magnesium sulfate and concentrated in vacuo to yield 2,2-bis(6-hydroxy-5,5-dimethylhexyl)malonic acid (7.8 g, 82%) as a yellow solid. M.P.: 178-180° C. 1H NMR (300 MHz, CD3OD/TMS): δ (ppm): 4.86 (s br., 4H), 3.22 (s, 4H), 1.9-1.8 (m, 4H), 1.36-1.10 (m, 12H), 0.84 (s, 12H). 13C NMR (75 MHz, CD3OD/TMS): δ (ppm): 176.0, 72.0, 58.7, 39.8, 36.0, 34.1, 26.5, 25.5, 24.5. HRMS (LSIMS, gly): Calcd. for C19H37O6 (MH+): 361.2590. found: 361.2582. The reaction mixture was heated at reflux for 14 h The ethanol was removed under reduced pressure the aqueous solution was extracted with chloroform (2×50 mL) extracted with diethyl ether (3×50 mL) The ethereal phases were dried over magnesium sulfate concentrated in vacuo