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2,3,4,6,7,8,9,10-Octahydropyrimidol[1,2-a]azepine, DBU
Empirical Formula (Hill Notation):
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

vapor pressure

5.3 mmHg ( 37.7 °C)

Quality Level



greener alternative product characteristics

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refractive index

n20/D 1.522-1.524 (lit.)


80-83 °C/0.6 mmHg (lit.)


1.018 g/mL at 25 °C (lit.)

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General description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for catalytic efficiency. Click here for more information.
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.


Used in a new synthesis of the ABCD ring system of Camptothecin.
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) may be used:
  • as catalyst for carboxylic acid esterification with dimethyl carbonate
  • in the synthesis of duocarmycin and CC-1065 analogs
  • as catalyst in aza-Michael addition and Knovenegal condensation reaction
  • 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)
  • in a new synthesis of the ABCD ring system of Camptothecin
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.


25, 100, 500 g in glass bottle
2.5 kg in glass bottle

Features and Benefits

Strong hindered amine base.


An application review.


CorrosionSkull and crossbones



Hazard Classifications

Acute Tox. 3 Oral - Aquatic Chronic 3 - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B

Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK Germany


Flash Point F

240.8 °F

Flash Point C

116 °C

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

DBU (1, 8-diazabicyclo [5.4. 0] undec-7-ene)-A Nucleophillic Base.
Ghosh N
Synlett, 2004(03), 574-575 (2004)
Zhi-Hao Cui et al.
Journal of chemical theory and computation, 16(1), 119-129 (2019-12-10)
We describe an efficient quantum embedding framework for realistic ab initio density matrix embedding theory (DMET) calculations in solids. We discuss in detail the choice of orbitals and mapping to a lattice, treatment of the virtual space and bath truncation...
Synlett, 3, 574-575 (2004)
W C Shieh et al.
Organic letters, 3(26), 4279-4281 (2002-01-11)
1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) is a novel and active catalyst in promoting the methylation reaction of phenols, indoles, and benzimidazoles with dimethyl carbonate under mild conditions. Additional rate enhancement is accomplished by applying microwave irradiation. By incorporating tetrabutylammonium iodide, the same microwave...
Synthesis of cellulose acetate propionate and cellulose acetate butyrate in a CO2/DBU/DMSO system.
Xu Q, et al.
Cellulose, 25(1), 205-216 (2018)


Deoxyfluorination with 2-Pyridinesulfonyl Fluoride (PyFluor)

The prevalence of organofluorine compounds in industry and drug design necessitates the ability to introduce C–F bonds to molecules.

Carbohydrate-Catalyzed Enantioselective Alkene Diboration

Enantioselective alkene diboration is a valuable strategy for transforming unsaturated hydrocarbons into useful chiral building blocks.

AISF: A Stable, Solid Alternative to Sulfuryl Fluoride Gas

A solid and bench-stable alternative to sulfuryl fluoride gas has been developed, 4-(Acetylamino)phenyl]imidodisulfuryl difluoride (ASIF). ASIF is a shelf-stable, crystallilne reagent for the installation of the valuable SO2F functional group.

Knoevenagel Condensation Reaction

Knoevenagel Condensation is an organic reaction named after Emil Knoevenagel. It is a classic C-C bond formation reaction and a modification of the Aldol Condensation.

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