-CAS number: 623-25-6- Product description: White to light yellow crystalline solid, melting point 98-101 ℃, boiling point 254 ℃, with a pungent odor, insoluble in water, soluble in most organic solvents such as methanol and ketones. This product is a highly active bifunctional intermediate containing two chloromethyl groups. It has strong reactivity, good selectivity, high purity (≥ 98%), excellent derivatization ability, few side reactions, and high conversion rate. Widely used in organic synthesis for the preparation of p-phenylenedimethanol, p-phenylenedialdehyde, etc., used as intermediates in pharmaceuticals, pesticides, dyes, as well as in the synthesis of electronic circuit boards, wear-resistant materials, and heavy metal complexing agents. Sealed and stored in a cool, dry, and ventilated warehouse, away from heat sources, fire sources, and strong oxidants, and protected from moisture and direct sunlight.