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Sulfur Dioxide 1-Methylpyrrolidine Adduct
(CAS RN:2098851-56-8 Product Number:U0113)


Sulfur Dioxide 1-Methylpyrrolidine Adduct
Synonym TIMSO

General Information

Product Number U0113

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Purity/Analysis Method >96.0%(T)
Storage Temperature <0°C
M.F. / M.W. C5H11NO2S=149.21
CAS RN 2098851-56-8
Related CAS RN
MDL Number
Packaging and Container
  • Product Details
  • Safety & Regulations
  • Reference & Application


Purity(Neutralization titration) min. 96.0 %


Signal Word Danger
Hazard Statements
  • H225
  • :Highly flammable liquid and vapor.
  • H315
  • :Causes skin irritation.
  • H319
  • :Causes serious eye irritation.
Precautionary Statements
  • P210
  • :Keep away from heat, sparks, open flames and hot surfaces. – No smoking.
  • P233
  • :Keep container tightly closed.
  • P240
  • :Ground and bond container and receiving equipment.
  • P241+P242+P243
  • :Use explosion-proof electrical, ventilating and lighting equipment. Use only non-sparking tools. Take precautionary measures against static discharge.
  • P264
  • :Wash hands and face thoroughly after handling.
  • P280
  • :Wear protective gloves, eye protection.
  • P302+P352+P332+P313+P362+P364
  • :If on skin: Wash with plenty of soap and water. If skin irritation occurs: Get medical advice or attention. Take off contaminated clothing and wash it before reuse.
  • P305+P351+P338+P337+P313
  • :If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice or attention.
  • P403+P235
  • :Store in a well-ventilated place. Keep cool.
  • P501
  • :Dispose of contents and container in accordance with local, regional, national regulations (e.g. US: 40 CFR Part 261, EU:91/156/EEC, JP: Waste Disposal and Cleaning Act, etc.).

Transport Information

UN Number 1993
Class 3
Packing Group II


Direct Synthesis of Lithium Pyridinesulfinate using TIMSO

To a solution of 5-bromo-2-methoxypyridine (2.5 mL, 19.3 mmol) in THF (100.0 mL) at -78 °C, n-BuLi (8.2 mL, 2.12 M in hexane, 17.4 mmol, 0.9 equiv.) is added slowly. The mixture is stirred for 40 minutes before U0113 (1.0 equiv.) is added slowly. After complete addition, the solution is allowed to warm to room temperature and the crude product is collected by vacuum filtration and washed with acetone (2 x 20 mL) and Et2O (2 x 20 mL) to yield the lithium pyridinesulfinate (3.4 g, 99%).


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