1,2,4-苯三酚

1,2,4-苯三酚

benzene-1,2,4-triol

533-73-3

C6H6O3

126.11000

60.69000

0.80340

126.03200

1.5445 (20ºC)

暗蓝色粉末

通风低温干燥,与库房食品原料分开存放

34.2ºC

132.9ºC at 760 mmHg

140 °C (subl.)(lit.)

1.488

freely soluble

Stable under normal temperatures and pressures. May discolor on exposure to air. Light sensitive.

GHS05, GHS07

危险

H302; H315; H318; H335

P261; P280; P305 + P351 + P338

DC4200000

3

S26-S39-S36/37/39-S22

2907299090

Xn

R20/21/22; R36/37/38

2933990090

2933990090. 其他仅含氮杂原子的杂环化合物. 增值税率:17.0%. 退税率:13.0%. 监管条件:无. 最惠国关税:6.5%. 普通关税:20.0%

2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

<p>由对苯醌和乙酐制得1,2,4-苯三酚三乙酸酯，再与盐酸作用即得该品。1.1,2,4-苯三酚三乙酸酯的制备将干燥的对苯醌分次加入乙酐和浓硫酸的混合物中，反应温度为40-50℃，反应1-3h。向反应物加冷水，将析出的沉淀过滤、冷水洗涤，用醇重结晶，即得1,2,4-苯三酚三乙酸酯。熔点96.5-97℃。2.1,2,4-苯三酚的制备将5%盐酸与1,2,4-苯三酚三乙酸酯一起搅拌加热至90℃，水解20min，冷却。用碳酸钠中和，过滤。滤液用乙醚提取，将乙醚提取液加热蒸去乙醚，即得1,2,4-苯三酯。</p>

<p>有机合成中间体，气体分析吸收剂。</p>