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3-Isopropoxy-4-(tri-n-butylstannyl)-3-cyclobutene-1,2-dione is used as pharmaceutical intermediate.
Lanny S.Liebeskind; Richard W.Fengl. 3-Stannylcyclobutenediones as nucleophilic cyclobutenedione equivalents. Synthesis of substituted cyclobutenediones and cyclobutenedione monoacetals and the beneficial effect of catalytic copper iodide on the Stille reaction. J. Org. Chem. 1990, 55, (19),5359-5364
Lanny S.Liebeskind; Marvin S.Yu; Richard H.Yu; Jianying Wang; Karl S.Hagen. 4,4"-Bi(cyclobutene-1,2-diones): bisquaryls. J. Am. Chem. Soc. 1993, 115, (20),9048-9055
危险说明（欧盟）:H301-H312-H315-H319-H372-H410
Toxic if swallowed. Harmful in contact with skin. Causes skin irritation. Causes serious eye irritation. Causes damage to organs through prolonged or repeated exposure. Very toxic to aquatic life with long lasting effects.
防范说明:P264b-P270-P280-P301+P310-P302+P352-P305+P351+P338-P312-P330-P362-P405-P501c
Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. IF ON SKIN: Wash with plenty of soap and water. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. Rinse mouth. Take off contaminated clothing and wash before reuse. Store locked up. Dispose of contents/ container to an approved waste disposal plant
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