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HomeProduct name listTEBBE REAGENT

TEBBE REAGENT

Synonym(s):Bis(cyclopentadienyl)-μ-chloro-(dimethylaluminum)-μ-methylenetitanium

TEBBE REAGENT Structural

What is TEBBE REAGENT?

Chemical properties

Dark red to purple solution

Chemical properties

The Tebbe reagent is the organometallic compound with the formula (CH)TiCHClAl(CH). It is used in the methylenation of carbonyl compounds, that is it converts organic compounds containing the RC=O group into the related RC=CH derivative.It is a red solid that is pyrophoric in the air, and thus is typically handled with air-free techniques. It was originally synthesized by Fred Tebbe at DuPont Central Research. Tebbe's reagent contains two tetrahedral metal centers linked by a pair of bridging ligands. The titanium has two cyclopentadienyl ([CH]-, or Cp) rings and aluminium has two methyl groups. The titanium and aluminium atoms are linked together by both a methylene bridge (-CH-) and a chloride atom in a nearly square-planar (Ti–CH–Al–Cl) geometry.The Tebbe reagent was the first reported compound where a methylene bridge connects a transition metal (Ti) and a main group metal (Al).Preparation The Tebbe reagent is synthesized from titanocene dichloride and trimethylaluminium in toluene solution.

The Uses of TEBBE REAGENT

μ-Chloro-μ-methylenebis(cyclopentadienyl)titaniumdimethylaluminum is used in organic synthesis for carbonyl methylenation, A versatile methylenation reagent for the conversion of ketones and aldehydes to olefins, it offers facile reaction with hindered ketones and allows the conversion of esters to vinyl ethers. Tebbe reagent can be used to olefinate aldehydes, to methylenate a chiral polyhydroxyketone with high diasteroselctivity.

The Uses of TEBBE REAGENT

Reagent for the methylenation of carbonyl groups.

The Uses of TEBBE REAGENT

Tebbe reagent can be used:?????

  • For the conversion of carbonyl groups of chlorophyll derivatives into the corresponding exo-methylene (or vinylidene) groups.
  • In the synthesis of β-C-glycosides from 3-OH glycol esters.
  • As a versatile methylenation reagent for the conversion of ketones and aldehydes to olefins. It offers facile reaction with hindered ketones and allows the conversion of esters to vinyl ethers.
  • To olefinate aldehydes.
  • To methylenate a chiral polyhydroxyketone with high diasteroselctivity.

General Description

Tebbe reagent is a Lewis acid stabilized organometallic compound, which is used to transform carbonyl groups into β-substituted methylenes. It also reacts with a wide range of carbonyl compounds, including esters, amides, and lactones to yield corresponding olefins.

Properties of TEBBE REAGENT

Density  0.96 g/mL at 20 °C
Flash point: 34 °F
storage temp.  Refrigerator
form  Solution
color  Dark red to purple
Water Solubility  Soluble in toluene, benzene, dichloromethane. Insoluble in water.
Sensitive  Air & Moisture Sensitive
Merck  9091
Exposure limits ACGIH: TWA 20 ppm
OSHA: Ceiling 300 ppm; TWA 200 ppm
NIOSH: IDLH 500 ppm; TWA 100 ppm(375 mg/m3); STEL 150 ppm(560 mg/m3)

Safety information for TEBBE REAGENT

Signal word Danger
Pictogram(s)
ghs
Flame
Flammables
GHS02
ghs
Corrosion
Corrosives
GHS05
ghs
Exclamation Mark
Irritant
GHS07
ghs
Health Hazard
GHS08
GHS Hazard Statements H225:Flammable liquids
H261:Substances And Mixtures Which, In Contact With Water,Emit Flammable Gases
H302:Acute toxicity,oral
H304:Aspiration hazard
H314:Skin corrosion/irritation
H318:Serious eye damage/eye irritation
H333:Acute toxicity,inhalation
H336:Specific target organ toxicity,single exposure; Narcotic effects
H361:Reproductive toxicity
H373:Specific target organ toxicity, repeated exposure
Precautionary Statement Codes P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P223:Keep away from any possible contact with water, because of violent reaction and possible flash fire.
P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P310:Immediately call a POISON CENTER or doctor/physician.
P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405:Store locked up.

Computed Descriptors for TEBBE REAGENT

InChIKey QEJAQNUJXFLWSP-UHFFFAOYSA-M

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