Neostigmine shows notable UV/VIS absorption at 261nm, 267nm, and 225nm.
Neostigmine's 1H NMR Spectroscopy reveals shifts at: 7.8, 7.7, 7.4, 7.4, 3.8, and 3.1 parts per million. The higher shifts are due to the aromatic hydrogens. The lower shifts at 3.8ppm and 3.1ppm are due to the electronic withdrawing nature of the tertiary and quarterary nitrogen, respectively.
pnmr of neostigime
13c nmr
HMBC SPECTRUM
IR
Neostigmine, N,N,N-trimethyl-meta-(dimethylcarbomoyloxy)-phenylammonium methylsulfonate, which can be viewed as a simplified analog of physostigmine, is made by reacting 3-dimethylaminophenol with N-dimethylcarbamoyl chloride, which forms the dimethylcarbamate, and its subsequent alkylation using dimethylsulfate forming the desired compound. 
- 43. J.A. Aeschlimann, U.S. Patent 1,905,990 (1933).
Spectral data[
Neostigmine shows notable UV/VIS absorption at 261 nm, 267 nm, and 225 nm.[7]
Neostigmine's 1H NMR Spectroscopy reveals shifts at: 7.8, 7.7, 7.4, 7.4, 3.8, and 3.1 parts per million. The higher shifts are due to the aromatic hydrogens. The lower shifts at 3.8ppm and 3.1ppm are due to the electronic withdrawing nature of the tertiary and quarterary nitrogen, respectively.[8]
- Porst H; Kny L (May 1985). "[The structure of degradation products of neostigmine bromide]". Pharmazie. (in German) 40 (5): 325–8. PMID 4034636.
- ^ Ferdous, Abu J; Waigh, Roger D (1993). "Application of the WATR technique for water suppression in 1H NMR spectroscopy in determination of the kinetics of hydrolysis of neostigmine bromide in aqueous solution". Journal of Pharmacy and Pharmacology 45 (6): 559–562. doi:10.1111/j.2042-7158.1993.tb05598.x. PMID 8103105
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