3-methylbut-2-enal

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

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

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

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

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

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

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

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

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

Procedure: A mixture of 3-E-3-benzylidene-1,3-dihydro-indol-2-one (10.0 mmol), N-methyl-glycine (14 mmol) and 3-methyl-but-2-enal (14 mmol) in 100 mL toluene was refluxed for 6 hours. The solvent was removed and the residue was purified on silica gel column to yield the product. was refluxed for 6 hours The solvent was removed the residue was purified on silica gel column to yield the product

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

Procedure: A mixture of 3-E-3-benzylidene-1,3-dihydro-indol-2-one (10.0 mmol), N-methyl-glycine (14 mmol) and 3-methyl-but-2-enal (14 mmol) in 100 mL toluene was refluxed for 6 hours. The solvent was removed and the residue was purified on silica gel column to yield the product. was refluxed for 6 hours The solvent was removed the residue was purified on silica gel column to yield the product

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

Procedure: Examples of reactions which can be carried out particularly expediently in the reactors according to the invention are, without this listing being exhaustive: dehydrogenations, for example, of cyclohexylidene-aniline to give diphenylamine and of cyclohexenyl-cyclohexanone to give o-phenylphenol; hydrogenations, for example, of nitrobenzene to give aniline and of phenol to give cyclohexanone; oxidative alcohol dehydrogenations, for example, of 3-methyl-3-buten-1-ol to give 3-methyl-2-buten-1-al; selective oxidations of hydrocarbons, for example, of n-butane to give maleic anhydride, of oxylene to give phthalic anhydride and of propene to give acrolein or acrylic acid and alkylations and halogenations.

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.5 g of 3-methyl-benzo[d]isothiazol-6-ol in 26 ml of THF are added to a LDA solution previously prepared from 3.9 ml of diisopropylamine and 16.0 ml of n-butyllithium (1.6M in hexane) in 23 ml of THF and the mixture is stirred at -78° C. 2.5 ml of 3-methyl-2-butenal in 40 ml of THF are added. The reaction mixture is thawed overnight and neutralized with 3.9 ml of acetic acid in 20 ml of ether. The mixture is added to sodium hydrogen carbonate solution, the inorganic phase is extracted with ethyl acetate and the organic phases are washed with sodium chloride solution and dried. The crude product is purified by chromatography (silica gel, ethyl acetate:hexane 1:1). 1.5 g of (RS)-3-(2-hydroxy-4-methyl-pent-3-enyl)-benzo[d]isothiazol-6-ol are obtained. the inorganic phase is extracted with ethyl acetate the organic phases are washed with sodium chloride solution dried The crude product is purified by chromatography (silica gel, ethyl acetate:hexane 1:1)