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ChemicalBook--->CAS DataBase List--->16689-35-3

16689-35-3

16689-35-3 Structure

16689-35-3 Structure
IdentificationBack Directory
[Name]

1-Boc-2-isopropylhydrazine
[CAS]

16689-35-3
[Synonyms]

1-Boc-2-isopropylhydrazine
tert-Butyl 3-(Isopropyl)carbazate
tert-Butyl 3-(Isopropyl)carbazate >
t-Butyl 2-isopropylhydrazinecarboxylate
tert-Butyl 3-(Isopropyl)carbazate
tert-Butyl 2-isopropylhydrazinecarboxylate
1-tert-Butoxycarbonyl-2-isopropylhydrazine
3-(Isopropyl)carbazic Acid tert-Butyl Ester
tert-butyl2-isopropylhydrazine-1-carboxylate
2-Isopropylhydrazinecarboxylic acid tert-butyl ester
N-Isopropyl-Hydrazinecarboxylic Acid Tert-Butyl Ester
Hydrazinecarboxylic acid, 2-(1-methylethyl)-, 1,1-dimethylet...
Hydrazinecarboxylic acid, 2-(1-methylethyl)-, 1,1-dimethylethyl ester
[Molecular Formula]

C8H18N2O2
[MDL Number]

MFCD14635748
[MOL File]

16689-35-3.mol
[Molecular Weight]

174
Chemical PropertiesBack Directory
[Melting point ]

47-51℃
[Boiling point ]

80°C/0.6mmHg(lit.)
[density ]

0.956
[storage temp. ]

under inert gas (nitrogen or Argon) at 2-8°C
[solubility ]

soluble in Methanol
[form ]

powder to crystal
[color ]

White to Almost white
[CAS DataBase Reference]

16689-35-3
Safety DataBack Directory
[Symbol(GHS) ]


GHS07
[Signal word ]

Warning
[Hazard statements ]

H335-H332-H315-H302-H319-H312
[Precautionary statements ]

P264-P280-P302+P352-P321-P332+P313-P362-P264-P270-P301+P312-P330-P501-P280-P302+P352-P312-P322-P363-P501-P264-P280-P305+P351+P338-P337+P313P-P261-P271-P304+P340-P312
[HS Code ]

2928009090
Hazard InformationBack Directory
[Synthesis]

3-Isopropylidenecarbazic acid tert-butyl ester

16689-34-2

1-Boc-2-isopropylhydrazine

16689-35-3

General procedure for the synthesis of 1-Boc-2-isopropylhydrazine from tert-butyl 2-(propan-2-ylidene)hydrazinecarboxylate: tert-butyl 2-(propan-2-ylidene)hydrazinecarboxylate (0.51 g, 3.0 mmol) was dissolved in 20 mL of tetrahydrofuran (THF), sodium cyanoborohydride (NaBH3CN, 0.19 g, 3.0 mmol) and a small amount of bromocresol green was added as the indicator. Subsequently, 1.5 mL of THF solution of p-toluenesulfonic acid (0.57 g, 3.0 mmol) was added slowly and dropwise over about 1 hour, maintaining the pH of the reaction system between 3.5 and 5.0. The reaction mixture was continued to be stirred at room temperature for 1 h before the solvent was removed by rotary evaporation. The residue was extracted by partitioning with ethyl acetate (30 mL) and saturated saline. The organic phase was washed sequentially with saturated sodium bicarbonate solution (20 mL) and saturated saline, and then evaporated to dryness. The obtained residue was dissolved in 10 mL of ethanol, 3.6 mL of 1M sodium hydroxide solution (3.6 mmol) was added and stirred at room temperature for 30 min. After completion of the reaction, the solvent was removed by rotary evaporation and the residue was dissolved in ethyl acetate and extracted with water. The organic layer was evaporated under reduced pressure and the residue was purified by column chromatography to afford tert-butyl 2-isopropylhydrazinecarboxylate (0.4 g, 77% yield) using a dichloromethane solution of 5% methanol as eluent. The product characterization data were as follows: melting point 47-49 °C; thin layer chromatography Rf=0.44 (dichloromethane solution of 5% methanol); 1H NMR (300 MHz, CDCl3) δ 6.03 (s, 1H, NH), 3.92 (s, 1H, NH), 3.14 (m, 1H), 1.46 (s, 9H), 1.02 (d, 6H, J=6 Hz); 13C NMR (300 MHz, CDCl3) δ 157.2, 80.8, 51.2, 28.7, 21.0.

[References]

[1] Polish Journal of Chemistry, 2002, vol. 76, # 12, p. 1693 - 1697
[2] Journal of the American Chemical Society, 2004, vol. 126, # 21, p. 6759 - 6764
[3] Patent: WO2014/140073, 2014, A1. Location in patent: Page/Page column 24
[4] Chemistry - A European Journal, 2018, vol. 24, # 33, p. 8325 - 8330
[5] Patent: WO2004/56751, 2004, A1. Location in patent: Page 18-19
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