Description

Specifications Table

Product Name – 1-Naphthol LR
Quantity/Pack Size – 100 g
Form – Crystalline Solid
Grade – LR (Laboratory Reagent)
Application – Organic Synthesis, Dye Intermediate, Qualitative Analysis

Product Overview

1-Naphthol LR is a high-purity laboratory reagent widely recognized for its versatility in organic synthesis and analytical applications. This white crystalline solid exhibits a characteristic phenolic odor and serves as a key intermediate in dye manufacturing, pharmaceutical synthesis, and biochemical research. Its LR (Laboratory Reagent) grade ensures consistent performance in qualitative tests, including colorimetric reactions and precipitation assays. The compound’s hydroxyl group enables facile derivatization, making it indispensable for coupling reactions in organic chemistry. With a melting point of approximately 96°C, it remains stable under standard lab conditions but requires protection from light and moisture to prevent oxidation. Compatible with common organic solvents like ethanol and ether, 1-Naphthol LR dissolves readily, facilitating homogeneous reactions. Its role in diazonium salt coupling for azo dye production highlights its industrial significance, while its use in biochemical assays underscores its analytical utility. Store in a tightly sealed container away from oxidizing agents to maintain purity and extend shelf life.

FAQs

1. What is the solubility profile of 1-Naphthol LR in different solvents?

1-Naphthol LR is soluble in ethanol, ether, and chloroform but has limited solubility in water. It dissolves more readily in alkaline solutions due to deprotonation of the hydroxyl group.

2. Can this reagent be used for quantitative analysis, or is it limited to qualitative tests?

While primarily used for qualitative applications like color tests, 1-Naphthol LR can be employed in quantitative assays when paired with standardized procedures and calibration curves.

3. What precautions should be taken when handling 1-Naphthol LR?

Wear nitrile gloves, safety goggles, and a lab coat. Avoid inhalation of dust and ensure adequate ventilation, as it may cause skin irritation and respiratory discomfort.

4. How does the LR grade differ from AR or analytical-grade 1-Naphthol?

LR grade is suitable for general lab use with slightly lower purity (~98%) compared to AR grade (~99.5%). AR grade is preferred for precise analytical work requiring minimal impurities.

5. What are the signs of degradation in stored 1-Naphthol LR?

Discoloration (yellowing or browning) and a stronger phenolic odor indicate oxidation. Store in amber bottles with desiccants to minimize degradation over time.