1,1-Cyclopropanedicarboxylic Acid: Handling & Use Protocol

1,1-Cyclopropanedicarboxylic Acid is a strained-ring gem-dicarboxylic acid widely employed as a rigid, conformationally restricted building block in medicinal chemistry, total synthesis, and materials research.

CAS Number

598-10-7

Molecular Formula

C5H6O4

Molecular Weight

130.10 g/mol

Appearance

White to off-white crystalline powder

Recommended Storage

Store at room temperature in a cool, dry, well-ventilated area away from moisture and incompatible materials

SKU

C133934

Safety & Pre-Handling Precautions

Before working with 1,1-Cyclopropanedicarboxylic Acid (SKU C133934), consult the Safety Data Sheet (SDS) supplied by Aladdin Scientific. The compound is an organic acid and may cause skin, eye, and respiratory irritation upon direct contact or inhalation of dust.

Required personal protective equipment (PPE):

• Chemical-splash safety goggles
• Nitrile or neoprene gloves
• Laboratory coat or chemical-resistant apron
• Dust/mist respirator if handling large quantities or generating fine powder

Perform all weighing and transfer operations in a fume hood or with adequate local exhaust ventilation. Keep the reagent away from strong oxidisers, strong bases, and ignition sources. In the event of skin or eye contact, flush immediately with copious amounts of water for at least 15 minutes and seek medical attention.

Materials & Equipment

The following materials and equipment are recommended for typical handling, dissolution, and use of 1,1-Cyclopropanedicarboxylic Acid in laboratory protocols:

• 1,1-Cyclopropanedicarboxylic Acid (Aladdin SKU C133934)
• Analytical balance (0.1 mg readability)
• Calibrated volumetric glassware (volumetric flasks, measuring cylinders)
• Appropriate solvent(s): water, methanol, ethanol, acetone, ethyl acetate, or dimethyl sulfoxide (DMSO) depending on application
• Magnetic stir plate and stir bar
• pH meter or pH indicator strips (if preparing aqueous solutions)
• Inert-atmosphere setup (Schlenk line or glove box) if moisture-sensitive downstream reactions are planned
• Appropriate waste containers labelled for organic acid waste

Verify solvent compatibility with your specific downstream application before preparing stock solutions.

Step-by-Step Protocol: Dissolution & Stock Solution Preparation

Follow these steps to prepare a stock solution of 1,1-Cyclopropanedicarboxylic Acid for use in synthesis or analytical assays:

1. Equilibrate to room temperature: Remove the reagent bottle from storage and allow it to equilibrate to room temperature (approximately 15–25 °C) before opening to prevent condensation.
2. Weigh the target mass: Tare a clean, dry weighing vessel on the analytical balance. Transfer the desired amount of 1,1-Cyclopropanedicarboxylic Acid (MW = 130.10 g/mol) and record the exact mass.
3. Select and add solvent: Transfer the weighed solid to an appropriate volumetric flask. Add approximately 70–80% of the final target volume of chosen solvent (e.g., deionised water, methanol, or DMSO). The compound exhibits good solubility in polar protic solvents and moderate solubility in ethyl acetate.
4. Dissolve with agitation: Place on a magnetic stir plate and stir at moderate speed until the solid is completely dissolved. Mild warming (30–40 °C water bath) may assist dissolution in less polar solvents; avoid heating above 60 °C to prevent any risk of decomposition.
5. Adjust to final volume: Once fully dissolved, bring the solution to the final target volume with additional solvent. Mix thoroughly.
6. Filter if required: Pass the solution through a 0.22 µm PTFE or nylon syringe filter if particulate-free solution is required for analytical use.
7. Label and store: Label the stock solution with compound name, concentration, solvent, date of preparation, and preparer's initials. Store at 2–8 °C if using aqueous solutions, or as appropriate for the chosen solvent system. Use within a validated stability window.

Note: Verify purity and concentration by appropriate analytical methods (e.g., HPLC, titration, NMR) before use in critical assays.

Typical Applications in Research

1,1-Cyclopropanedicarboxylic Acid (C133934) serves as a versatile synthetic building block across multiple research disciplines:

• Medicinal Chemistry: The gem-dicarboxylic acid motif of the cyclopropane ring is exploited to introduce conformational rigidity into drug candidates, improve metabolic stability, and modulate physicochemical properties such as lipophilicity and aqueous solubility. It is used in the synthesis of protease inhibitors, GPCR ligands, and other bioactive scaffolds.
• Total Synthesis: The compound acts as a precursor for cyclopropane ring-containing natural products. Decarboxylation of one carboxyl group under controlled conditions provides cyclopropanecarboxylic acid, while both carboxyl groups can participate in amide coupling, esterification, or reduction reactions.
• Coordination Chemistry & Materials: Dicarboxylic acids are commonly employed as bridging ligands in the construction of metal-organic frameworks (MOFs) and coordination polymers, where the cyclopropane spacer introduces geometric rigidity.
• Polymer Chemistry: Can serve as a rigid diacid monomer for condensation polymerisation to generate polyesters or polyamides with constrained backbone conformations.

Always confirm suitability of reagent grade for your specific application and consult relevant literature before beginning a new synthetic protocol.

Troubleshooting & Best Practices

The following guidance addresses common challenges encountered when working with 1,1-Cyclopropanedicarboxylic Acid:

Issue	Likely Cause	Recommended Action
Incomplete dissolution in aqueous buffer	pH too low; compound is a diprotic acid (pKa values to be confirmed)	Adjust buffer pH above the higher pKa; add NaOH dropwise to aid ionisation
Discolouration of stored solid	Moisture uptake or prolonged exposure to light/heat	Store in sealed, amber vial under dry conditions; check SDS for specific storage requirements
Low yield in esterification	Competitive decarboxylation or insufficient activation	Use mild coupling reagents (DCC/DMAP or EDC); keep temperature below 60 °C; confirm reaction conditions with small-scale test
Inconsistent HPLC purity results	Partial decarboxylation or column incompatibility	Use C18 reverse-phase column with acidic mobile phase (0.1% formic acid); store solutions at 4 °C and analyse promptly

Best Practices:

• Verify lot-specific certificate of analysis (CoA) for purity, melting point, and identity data before use.
• Use freshly prepared solutions where possible, especially for sensitive biological assays.
• Document all observations (colour, dissolution time, yield) for reproducibility records.

Frequently asked questions

What solvents are suitable for dissolving 1,1-Cyclopropanedicarboxylic Acid?

1,1-Cyclopropanedicarboxylic Acid dissolves readily in polar protic solvents such as water (especially at near-neutral or basic pH), methanol, and ethanol. It also shows moderate solubility in acetone and DMSO. Solubility in nonpolar solvents such as hexane or diethyl ether is expected to be low.

How should 1,1-Cyclopropanedicarboxylic Acid be stored to maintain stability?

The compound should be stored at room temperature in a tightly sealed container, in a cool, dry, and well-ventilated area protected from moisture, heat, and direct light. Always verify lot-specific storage recommendations on the certificate of analysis or SDS provided with SKU C133934.

Can 1,1-Cyclopropanedicarboxylic Acid undergo decarboxylation, and how can it be minimised?

As a gem-dicarboxylic acid (malonic acid analogue), 1,1-Cyclopropanedicarboxylic Acid can undergo thermal decarboxylation to yield cyclopropanecarboxylic acid under elevated temperature conditions. To minimise this, avoid heating solutions above 60 °C, keep reaction times short, and store solid material and solutions under recommended conditions. Verify product integrity by NMR or HPLC after prolonged storage.

What coupling reagents are recommended for amide bond formation using 1,1-Cyclopropanedicarboxylic Acid?

Standard carbodiimide-based reagents such as EDC (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) combined with NHS or HOBt, as well as DCC/DMAP systems, are commonly used for amide coupling of dicarboxylic acids. Phosphonium- or uronium-based reagents (e.g., HATU, HBTU) are also suitable. Mild conditions and low temperatures are preferred to avoid competing decarboxylation.

What is the molecular weight and CAS number of 1,1-Cyclopropanedicarboxylic Acid?

1,1-Cyclopropanedicarboxylic Acid has a molecular weight of 130.10 g/mol and a CAS number of 598-10-7. It is available from Aladdin Scientific under SKU C133934.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 4th ed.; Wiley: New York, 1992. (General reference for dicarboxylic acid reactivity and decarboxylation mechanisms.)
2. Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed.; Oxford University Press: Oxford, 2012. (General reference for malonic acid analogue reactivity and synthetic utility of cyclopropane building blocks.)
3. Aladdin Scientific. Certificate of Analysis, 1,1-Cyclopropanedicarboxylic Acid, SKU C133934. (Lot-specific analytical data; consult current CoA for purity and physical data.)

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.