Specification

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Chemical Identity and Structure

Ethyl 2-bromo-3-methylbutyrate is a monofunctional organic compound belonging to two important classes: α-halo esters and esters. Its molecular structure, CH?CH(CH?)CH(Br)COOCH?CH?, integrates several key features:

• Ester Functional Group (-COO-): The core of the molecule is a carboxylic ester, formed from 2-bromo-3-methylbutanoic acid and ethanol. This group confers moderate polarity and is responsible for the compound's characteristic, often fruity, odor.

  Halogen Substituent (Bromine): A bromine atom is attached to the alpha carbon (the carbon atom directly adjacent to the carbonyl carbon). This defines it as an α-halo ester, a property that dominates its chemical reactivity.

  Branched Carbon Chain (3-methylbutyrate skeleton): The carbon backbone is branched, featuring a -CH(CH?)? (isopropyl) group adjacent to the alpha carbon. This introduces significant steric bulk, which profoundly influences the compound's reactivity and the stereochemical outcome of its reactions.

Key Chemical Properties and Reactivity

The combination of the electron-withdrawing carbonyl group and the bromine atom on the same carbon makes Ethyl 2-bromo-3-methylbutyrate a highly versatile and electrophilic synthetic building block.

1. Reactivity as an Alkyl Halide (SN2 vs. SN1):

• The alpha-carbon is electrophilic and susceptible to nucleophilic substitution. However, the reaction pathway is heavily influenced by the adjacent branched chain.

  The steric hindrance from the isopropyl group significantly hinders a direct backside attack (S_N2 mechanism).

  Instead, the molecule favors S_N1-type reactivity. The ester's carbonyl group can stabilize a developing positive charge (carbocation) on the alpha carbon through resonance, facilitating the formation of a planar, carbocation-like transition state. This makes the bromine a good leaving group.

2. Enhanced Acidity of the α-Proton:

• The alpha-protons (on the carbon between the Br and the carbonyl) are more acidic than typical alkane protons. This is due to the electron-withdrawing effect of both the ester and bromine groups, which stabilize the resulting enolate anion. This allows for deprotonation with strong bases, enabling reactions like enolate alkylation.

Primary Synthetic Applications

This compound is predominantly used as an electrophilic building block in multi-step organic synthesis.

• Alkylation Agent: Its most common use is in the alkylation of enolates, particularly in the synthesis of α-substituted carbonyl compounds. For example, it is used to alkylate the enolates of malonate esters (malonic ester synthesis) or acetoacetate esters (acetoacetic ester synthesis) to introduce the branched 2-bromo-3-methylbutyl chain. Subsequent hydrolysis and decarboxylation yield complex carboxylic acids.

  Formation of New Carbon-Carbon Bonds: Through nucleophilic substitution, it can be used to attach its carbon skeleton to various nucleophiles like cyanide (CN?), alkoxides, or other carbon nucleophiles, thereby extending molecular frameworks.

  Introduction of Chirality: Because the alpha-carbon is a chiral center (especially when the nucleophile attacks the planar, carbocation-like transition state), reactions with this molecule can lead to the formation of new stereocenters. It is often used in racemic form, but its reactivity can be exploited in diastereoselective reactions when paired with a chiral substrate or catalyst.

Industrial and Research Context

Ethyl 2-bromo-3-methylbutyrate is a valuable intermediate in the fine chemical and pharmaceutical industries. Its structure is a useful precursor for synthesizing more complex molecules that contain branched alkyl chains, such as certain flavorings, fragrances, and active pharmaceutical ingredients (APIs) where the sterically hindered structure is a key pharmacophore.

In summary, Ethyl 2-bromo-3-methylbutyrate is a sterically hindered α-halo ester whose synthetic utility stems from its dual functionality. Its primary role is to serve as an electrophilic reagent for introducing a specific, branched carbon skeleton into a target molecule, enabling the efficient construction of complex organic structures.

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