Dopran Pharma Healthcare - Catalysts And Absorbents

The Uses of 4-Hydrazinobenzenesulfonamide

4-Hydrazinobenzenesulfonamide is a key starting material for synthesizing sulfonamides bearing 1, ?3, ?5-?triarylpyrazoline and 4-?thiazolidinone moieties as novel antimicrobial agents.

The Uses of 4-Hydrazinobenzenesulfonamide

Intermediate in the production of Celebrex.

A Celecoxib (Celebrex) intermediate

A Celecoxib (Celebrex) intermediate.

3-(1-Piperazinyl)-1, 2-benzisothiazole Hydrochloride (1:1), is a building block used for the preparation of Ziprasidone (Z485000), a combined serotonin (5HT2) and dopamine (D2) receptor antagonist. Also used as an antipsychotic.

2, 2''-Azobis(isobutyronitrile), or AIBN, is a commonly used initiator for free-radical reactions, including many polymerizations. Its preparation was first reported by Thiele and Heuser in 1896, and it has been used in polymerization since at least the 1940s. Its downsides are high toxicity (it decomposes to HCN in vivo), flammability, and the explosivity of its acetone solutions.

L-Valine methyl ester hydrochloride may serve as a convenient and available synthon for synthesising chiral nitrogen-containing organic compounds. The condensation of L-valine methyl ester hydrochloride with substituted benzaldehydes in the presence of sodium hydrogen carbonate (at the ratio of the stoichiometric reagents 1:1:1) afforded new chiral alkyl aromatic azomethines (Schiff bases) containing ether and ester groups.

In 1908, A. N. Meldrum condensed malonic acid with acetone to produce a compound he misidentified as a carboxylic acidhence the name Meldrums acid. Not until 1948 did D. Davidson and S. A. Bernhard show that the compound has the dioxane-dione structure shown here. Its acidity derives from the lability of the hydrogen atoms between the carbonyl groups. The same authors noted that Meldrums acid is a ketene precursor. Recently B. Moon and C. J. Hawker?used this property to create polymers with reactive ketene substituents.

Pyridinium Tribromide is a reagent used in the -thiocyanation of ketones and has also been applied to the synthesis of -adrenergic blocking agents (also known as -blockers) for patients with heart failPyridine hydrobromide perbromide is used as a brominating reagent in alfa-bromination and alfa-thiocyanation of ketones, phenols, unsaturated and aromatic ethers. It is used as a raw material in the preparation of beta-adrenergic blocking agents. Furthermore, it is used as an analytical reagent.ure.

Butyl bromide is a highly flammable, colorlessliquid with a pleasant odor. Molecular weight = 137.04.Boiling point =101.6; Specific gravity (H2O:1) = 1.276at 20; Freezing/Melting point = 2112.4; Vapor density(air 5 1) = 4.68; Flash point =18 (21 for sec-isomer).Autoigniton temperature = 265. Explosive limits:LEL =2.6% at 100; UEL =6.6% at 100. HazardIdentification (based on NFPA-704 M Rating System):Health 2, Flammability 3, Reactivity 0. Insoluble in water.

1-Bromopropane is a simple bromoalkane frequently used as an industrial solvent and degreasing agent. It is prepared commercially via the free-radical anti-Markovnikov hydrobromination of propylene.
Since 2000, 1-bromopropane has increasingly replaced toxic, ozone-depleting chlorocarbons and chlorofluorocarbons as dry-cleaning solvents. But using this brominated hydrocarbon presents many hazards (see hazard information table).
The US Environmental Protection Agency recently began to evaluate the health hazards of 1-bromopropane to workers. In its draft assessment, the agency reported that the solvent could pose unreasonable risks to workers, occupational nonusers, consumers, and bystanders under certain conditions of use. EPA is accepting comments on the draft until October 11.

Ethyl bromoacetate is a clear, colorless tolight-yellow liquid. Molecular weight = 167.02; Boilingpoint = 159. Freezing point 20; Flashpoint = 48. Hazard Identification (based on NFPA-704 MRating System): Health 2, Flammability 2, Reactivity 0.Insoluble in wateR.

Ethyl bromoacetate is widely used as an alkylating reagent involved in the Reformatsky reaction to prepare the beta-hydroxy esters by reacting with carbonyl compounds.

Bromoform is a colorless (turns yellow onexposure to air) with a sweet-smelling, chloroform-likeodor. Odor threshold=0.447 ppm. Molecular weight =252.8; Specific gravity (H2O:1)=2.9; Boiling point =149.5 ; Freezing/Melting point=8.3 (to hexagonalcrystals); Vapor pressure=5 mmHg at 20 . HazardIdentification (based on NFPA-704 M Rating System):Health 2, Flammability 0, Reactivity 0. Soluble in water;solubility=0.1% at 20 .

Bromotrimethylsilane is a mild and selective reagent for cleavage of lactones, epoxides, acetals, phosphonate esters and certain ethers; effective reagent for formation of silyl enol ethers; can function as brominating agent.
Amines react with TMS-Br to form isolable adducts, which react readily with ketones to form enamines under mild conditions (eq 15).

Diethyl 1, 1-Cyclopropanedicarboxylate (cas# 1559-02-0) is a compound useful in organic synthesis

Diethyl cyclopropane-1, 1-dicarboxylate participates in ring-opening addition reactions with various nucleophilic reagents.