1-(2-Chlorophenyl)biguanide Hydrochloride

This compound is typically obtained as a white to off-white crystalline powder. Its molecular formula is C8H11Cl2N5, corresponding to a molecular weight of 248.11. The melting point generally falls within the range of 229–234°C. It is soluble in polar organic solvents such as dimethyl sulfoxide and dimethylformamide, and exhibits hygroscopic properties, requiring storage under dry conditions. The molecule features a biguanide core attached to a 2-chlorophenyl ring, with four hydrogen bond donors and one acceptor. It should be stored in tightly sealed containers protected from light and moisture at ambient temperature, preferably under inert atmosphere to prevent absorption of atmospheric moisture. Contact with strong oxidizing agents should be avoided. It carries GHS hazard classifications indicating skin and eye irritation potential, with signal word "Warning".

1-(2-Chlorophenyl)biguanide hydrochloride is a biguanide derivative in which a 2-chlorophenyl group is attached to the biguanide core, presented as the hydrochloride salt. The biguanide moiety consists of two guanidine units connected by a carbon chain, creating a nitrogen-rich structure capable of multiple hydrogen bonding interactions and metal coordination. The 2-chlorophenyl substituent introduces electron-withdrawing character and lipophilicity through the ortho-chlorine atom, which can modulate binding interactions with biological targets and influence physicochemical properties. The compound exhibits a planar structure due to conjugation between the aromatic ring and the biguanide moiety. This combination of a metal-interactive biguanide core and a halogenated aromatic ring makes it a valuable building block in pharmaceutical research and organic synthesis, particularly in the development of compounds with potential antidiabetic, antibacterial, and antimalarial activities.

Antidiabetic Research
Biguanide derivatives, including this compound, have been investigated for their potential antidiabetic properties. Studies have evaluated biguanide derivatives for their ability to decrease elevated blood glucose levels in hyperglycemic models, with mechanisms involving regulation of energy metabolism and potential metal-interactive antiproteolytic properties that may inhibit insulin degradation and contribute to improved insulin sensitivity. This scaffold serves as a lead structure for developing new anti-diabetic agents for type II diabetes.

Antibacterial Applications
The antimicrobial efficacy of biguanide derivatives has been demonstrated against a range of both Gram-positive and Gram-negative bacteria. The positively charged biguanide moiety allows binding to negatively charged components of bacterial membranes, leading to membrane disruption through displacement of stabilizing ions and increased permeability, resulting in cell lysis. It has shown effectiveness against pathogens including Staphylococcus aureus and Escherichia coli, and is investigated for applications in wound healing and oral hygiene products where reduction of bacterial load and plaque formation is desired.

Antimalarial Research
Biguanides have been studied for their antimalarial effects, with mechanisms involving metal binding and inhibition of proteases like falcipain-2. This suggests a potential mechanism by which they could interfere with the degradation of hemoglobin in the food vacuoles of Plasmodium falciparum, the parasite responsible for malaria. The chlorophenyl group can influence lipophilicity and metabolic stability in such antiparasitic applications.

Pharmaceutical Intermediate and Organic Synthesis
This compound serves as a versatile building block in the synthesis of pharmacologically active molecules and for constructing novel heterocyclic compounds or functionalized aromatic systems. The chlorophenyl group can be exploited in cross-coupling reactions, while the biguanide core participates in various transformations including cyclizations and substitutions. It is used in academic and industrial research and development settings to investigate new reaction pathways, develop catalytic systems, and create specialized organic materials for fine chemical manufacturing.