2,5-二甲氧基-2,5-二氢呋喃

2,5-二甲氧基-2,5-二氢呋喃

2,5-dimethoxy-2,5-dihydrofuran

332-77-4

C6H10O3

130.14200

27.69000

0.51780

130.06300

n20/D 1.434(lit.)

透明黄色液体

117 °F

160-162 °C(lit.)

<-40ºC

1.073 g/mL at 25 °C(lit.)

Stable under normal temperatures and pressures.

Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.

GHS02

警告

H226

1

29321900

3

S16-S29-S33

III

UN 1993 3/PG 3

Xn

R10

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>由呋喃经醚化、还原而得。反应在电解槽中进行。将甲醇和溴化铵加入电解槽内搅拌,至溴化铵溶解。将溶液降温至0℃时,加入呋喃,将电解槽密闭继续冷却至-5℃以下,开通电解电路输入电流,操作正常后逐渐将电压调至15V左右,电流至40-45A,电解温度控制在0-5℃。电解结束后,停止搅拌,将电解液吸至甲醇回收锅,进行碱化。然后加热驱除氨气,蒸出甲醇,至气相温度达65℃时甲醇回收完毕。冷却,过滤,滤液进行分馏,收集152-164℃的正沸点馏分,即得2,5-二甲氧基二氢呋喃。</p>

<p>该品是合成法生产阿托品硫酸盐、山莨菪碱氢溴酸盐的中间体。2,5-二甲氧基二氢呋喃用盐酸水解生成2-羟基-1,4-丁二醛；加氢再水解可得丁二醛。</p>