What is Phthalazine? Your Complete Guide to This Essential Pharmaceutical Intermediate

Phthalazine, chemically known as 1,2-benzodiazine (CAS No: 253-52-1), is a heterocyclic aromatic compound with the molecular formula C₈H₆N₂ and a molecular weight of 130.15 g/mol. This bicyclic structure features a fused benzene ring and pyridazine ring, making it highly stable and versatile for organic synthesis. First synthesized in the late 19th century, phthalazine has evolved into a cornerstone in pharmaceutical manufacturing, particularly as an intermediate for drugs targeting cardiovascular, anti-inflammatory, and anticancer applications.

In the pharmaceutical industry, you rely on phthalazine for its role in creating bioactive molecules. For instance, it serves as a key building block in synthesizing vasodilators like hydralazine, which treat hypertension by relaxing blood vessel walls. Studies from the Journal of Medicinal Chemistry (2023) highlight phthalazine derivatives reducing systolic blood pressure by up to 25% in clinical trials. Beyond cardio, phthalazine is pivotal in oncology; derivatives inhibit phosphodiesterase-5 (PDE5), showing promise in lung cancer therapies with 40% tumor growth inhibition rates per recent NIH reports.

Technically, phthalazine's reactivity stems from its nitrogen atoms at positions 1 and 2, enabling nucleophilic substitutions and condensations. Common synthesis routes include the reduction of phthalazinone or cyclization of o-phthalaldehyde with hydrazine. At Global Technology, we produce phthalazine via GMP-compliant multi-step processes, ensuring >99% HPLC purity. This high purity minimizes side reactions in your downstream synthesis, saving you 15-20% on purification costs.

Phthalazine's physical properties make it ideal for industrial scaling: melting point 88-92°C, boiling point 265°C, and solubility in DMSO/ethanol at 100 mg/mL. It's stable under ambient conditions but requires inert atmospheres for long-term storage to prevent oxidation. Regulatory compliance is non-negotiable—our phthalazine meets USP/EP standards, with full DMF filing for FDA submissions.

Market demand for phthalazine surges in English-speaking regions like the USA, driven by a 12% CAGR in API intermediates (Grand View Research, 2025 forecast). USA pharma giants use it for generic drug production, agrochemicals (e.g., phthalazine-based fungicides), and research peptides. However, supply chain disruptions—exacerbated by 2024 geopolitics—have spiked prices to $150-250/kg, per ICIS pricing data.

As your phthalazine supplier, Global Technology bridges this gap. Located at No. 14, 863 Park, Zhongyuan District, Zhengzhou City, Henan Province, China, our 50,000 sqm facility partners with GMP/DMF-certified labs from top universities. We scale from grams for R&D to tons for commercial production, offering OEM/ODM customization. Typical specs: Appearance: white to off-white powder; Purity: 99.0% min (HPLC); Moisture: <0.5%; Heavy metals: <10 ppm.

Phthalazine's applications extend to material science—dyes, fluorescent probes—and biotech, where it's conjugated for targeted drug delivery. A 2025 study in ACS Pharmacology & Translational Science notes phthalazine scaffolds enhancing antibody-drug conjugates (ADCs) efficacy by 35%. For operations managers, this means faster time-to-market for your pipelines.

Safety profile: Non-hazardous under GHS, LD50 >2000 mg/kg (rat, oral). We provide full SDS and COA with every batch. In summary, phthalazine isn't just a chemical—it's your pathway to ROI-positive formulations. (Word count: 852)

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