1H-2-Benzopyran-1,3(4H)-dione (703-59-3)

 1H-2-Benzopyran-1,3(4H)-dione , its cas register number is 703-59-3. It also can be called  Homophthalic anhydride ; and Benzoglutaric anhydride .
 1H-2-Benzopyran-1,3(4H)-dione (CAS NO.703-59-3) is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Wash mouth out with water, and get medical aid immediately.
 1H-2-Benzopyran-1,3(4H)-dione (CAS NO.703-59-3) is moisture sensitive. It should avoid the condition like incompatible materials, exposure to moist air or water. It is not compatible with strong oxidizing agents, strong bases. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, carbon dioxide. However, its hazardous polymerization will not occur. In addition, it should keep refrigerated. (Store below 4°C/39°F.) And it should be stored in a tightly closed container, or stored in a dry area. And it should be kept under a nitrogen blanket.