Hydrochloric Acid → 4-[(1,3-Dithian-2-ylidene)(phenyl)methyl]phenol

HRID 1709007Notes

Reaction equation

HRID 1709007 reaction equation
C[Si](C)(C)[CH:3]1[S:8][CH2:7][CH2:6][CH2:5][S:4]1.C([Li])CCC.[OH:16][C:17]1[CH:30]=[CH:29][C:20]([C:21]([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)=O)=[CH:19][CH:18]=1.Cl>O1CCCC1.CCCCCC.O>[S:4]1[CH2:5][CH2:6][CH2:7][S:8][C:3]1=[C:21]([C:20]1[CH:19]=[CH:18][C:17]([OH:16])=[CH:30][CH:29]=1)[C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=1

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 143474-HydroxybenzophenoneHCID 834132-Trimethylsilyl-1,3-dithianeHCID 178418339Butyllithium2×

Product 1

HCID 133020044-[(1,3-Dithian-2-ylidene)(phenyl)methyl]phenol

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent2×

Procedure

To a solution of 2-trimethylsilyl-1,3-dithiane (29.1 g) in dry tetrahydrofuran (600 ml) is added at -65° a 1.4M solution of n-butyllithium in hexane (108 ml). The reaction mixture is progressively warmed to 0° during 4 hours and cooled to -65°. A further 1.4M solution of n-butyllithium in hexane (108 ml) and a solution of 4-hydroxybenzophenone (30.0 g) in dry tetrahydrofuran (180 ml) are added, the temperature being maintained under -60°. The reaction mixture is progressively warmed to room temperature overnight. The suspension is slowly poured into water (2 l) and acidified to pH 2 with hydrochloric acid (32%). The compound is immediately extracted with ethyl acetste (4×500 ml). The combined organic solutions are washed with water (3×250 ml) and dried over magnesium sulphate. The solvent is evaporated in vacuo. The residue is washed with hexane (3×50 ml) and then recrystallized from carbon tetrachloride. The product is dried in vacuo to constant weight to give (1,3-dithian-2-ylidene)-(4-hydroxyphenyl)-phenylmethane, m.p. 135°-137°.

Workup

  1. temperatureThe reaction mixture is progressively warmed to 0° during 4 hours
  2. temperaturecooled to -65°
  3. temperaturethe temperature being maintained under -60°
  4. extractionThe compound is immediately extracted with ethyl acetste (4×500 ml)
  5. washThe combined organic solutions are washed with water (3×250 ml)
  6. dry with materialdried over magnesium sulphate
  7. customThe solvent is evaporated in vacuo
  8. washThe residue is washed with hexane (3×50 ml)
  9. customrecrystallized from carbon tetrachloride
  10. customThe product is dried in vacuo to constant weight

Sources & evidence

ORD record
ord-a56da80c48a549c5af922a075c9de6bf
Source dataset
uspto-grants-1990_08
Patent number
US04946861

Reaction notes

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