Benzene → 4-Ethylphenyl isothiocyanate
Reaction equation
C([N:3]([CH2:6]C)[CH2:4][CH3:5])C.C(=S)=[S:9].ClC(O[CH2:15][CH3:16])=O.Cl.[CH:18]1C=C[CH:21]=[CH:20][CH:19]=1>CCCCCC.C(Cl)(Cl)Cl>[N:3]([C:4]1[CH:5]=[CH:21][C:20]([CH2:15][CH3:16])=[CH:19][CH:18]=1)=[C:6]=[S:9]Participants
Procedure
18 g (0.05 moles) 1-(p'-n-hexylbiphenylyl)-2-(p-aminophenyl)ethane was dissolved in 200 cm3 of benzene and 25 cm3 of hexane. Then 14 cm3 (0.1 mole) of triethylamine and 6 cm3 (0.1 mole) carbon disulphide was added to the solution. The components were well stirred and left in the fridge for 48 hours. A yellow salt triethyloamonium ditiocarbonate was preciptitated and filtered off and then washed with ether. The obtained produce was dissolved in 100 cm3 of chloroform, 10.5 cm3 of triethylamine was added to the solution and after cooling to 0° 7 g (0.075 mole) of ethyl chloroformate was added droppwise to the continuously stirring solution. After an hour 100 cm3 of 3N hydrochloric acid was poured into the reaction mixture, the layers were separated and the chloroform one was washed twice with water and dried MgSO4. After distilling chloroform off the solid residue was crystallized from isopropanol, then twice from n-hexane and once from a composition of methanol-chloroform. 5 g (25% yield) of 1-p'-n-hexylbiphenylyl)-2-(p-isothio-cyanatophenyl)ethane was obtained. The temperatures of phase transition: Cr 56°SB 99.5°N133°I.
Workup
- filtrationfiltered off
- washwashed with ether
- customThe obtained produce
- additionwas added droppwise to the continuously stirring solution
- customthe layers were separated
- washthe chloroform one was washed twice with water and dried MgSO4
- distillationAfter distilling chloroform off the solid residue
- customwas crystallized from isopropanol
Sources & evidence
- ORD record
- ord-ed073162167a4b3c87f353ebed0dbfd6
- Source dataset
- uspto-grants-1989_07
- Patent number
- US04849130
Reaction notes
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