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6674-22-2

Name 1,8-Diazabicyclo[5.4.0]undec-7-ene
CAS 6674-22-2
EINECS(EC#) 229-713-7
Molecular Formula C9H16N2
MDL Number MFCD00006930
Molecular Weight 152.24
MOL File 6674-22-2.mol

Chemical Properties

Description
1,8-Diazabicyclo[5.4.0]undec-7-ene is a bicyclic amidine base. It is non-nucleophilic, sterically hindered, tertiary amine base in organic chemistry. It is reported to be superior to amine catalyst in Baylis-Hillman reaction.It promotes the methylation reaction of phenols, indoles and benzimidazoles with dimethyl carbonate under mild conditions.
Appearance Colorless to yellow liquid
Melting point  -70 °C
Boiling point  80-83 °C0.6 mm Hg(lit.)
density  1.019 g/mL at 20 °C(lit.)
vapor pressure  5.3 mm Hg ( 37.7 °C)
refractive index  n20/D 1.523
Fp  >230 °F
storage temp.  Store at R.T.
solubility  soluble
form  Liquid
pka 13.28±0.20(Predicted)
color  Clear colorless to light yellow
Odor Unpleasant
PH 12.8 (10g/l, H2O, 20℃)
PH Range 12.8 at 10 g/l at 20 °C
Stability: Stable. Incompatible with strong oxidizing agents, acids, acid chlorides, acid anhydrides.
explosive limit 1.1-6.5%(V)
Water Solubility  soluble
Sensitive  Air Sensitive
Detection Methods GC,NMR
BRN  508906
InChIKey GQHTUMJGOHRCHB-UHFFFAOYSA-N
Uses
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) may be used:
  1. as catalyst for carboxylic acid esterification with dimethyl carbonate
  2. in the synthesis of duocarmycin and CC-1065 analogs
  3. as catalyst in aza-Michael addition and Knovenegal condensation reaction
  4. as base for dehalogenation of halogenated Diels-Alder adducts and the resulting activated 2,4-dienones were subjected to regio- and stereo-directed Michael additions, using Yamamoto′s reagent (CH3Cu · BF3)
  5. in a new synthesis of the ABCD ring system of Camptothecin
  6. 1,8-Diazabicyclo[5.4.0]undec-7-ene may be used as an catalyst for the dissolution and activation of cellulose by a reversible reaction of its hydroxyl groups with carbon dioxide. This dissolved cellulose system can be derivatized to form cellulose mixed esters.
  7. Used in a new synthesis of the ABCD ring system of Camptothecin.
CAS DataBase Reference 6674-22-2(CAS DataBase Reference)
NIST Chemistry Reference 1,8-diazabicyclo [5.4.0]undec-7-ene(6674-22-2)
Storage Precautions Air sensitive
EPA Substance Registry System 6674-22-2(EPA Substance)

Safety Data

Hazard Codes  C
Risk Statements 
R22:Harmful if swallowed.
R34:Causes burns.
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment .
R35:Causes severe burns.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S27:Take off immediately all contaminated clothing .
RIDADR  UN 3267 8/PG 2
WGK Germany  2
34
Autoignition Temperature 260 °C
TSCA  Yes
HazardClass  8
PackingGroup  II
HS Code  29339930
Toxicity
LD50 orally in Rabbit: 215 - 681 mg/kg

Hazard Information

Material Safety Data Sheet(MSDS)

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