我不死扛
发表于 2025-3-25 03:31:44
2-Methylfuran (Sylvan),e of the U-tube was connected to a sloping condenser, which was fitted with a long receiver adapter; the end of the adapter was in the lower part of a long-necked 100-ml flask, which served as a receiver and was cooled with ice water.
农学
发表于 2025-3-25 10:54:33
Furan,ed with pieces of sodium hydroxide of the size of a pea, which are separated from the end of the tube E by a layer of cotton wool (Note 1). The column F is immersed in a water bath (a tall beaker) at 45–50°. The exit tube of the column F is connected to a sloping condenser attached to a receiver immersed in ice and salt (Note 2).
辞职
发表于 2025-3-25 15:33:38
http://reply.papertrans.cn/89/8843/884255/884255_23.png
sulcus
发表于 2025-3-25 17:57:41
5-Benzyl-2-Furoic Acid,A mixture of 21.6 g (0.1 mole) of methyl 5-benzyl-2-furoate (see p. 17), b.p. 150–155° /1 mm, and 50 ml of 10% sodium hydroxide solution was prepared in a 150-ml round-bottomed flask fitted with stirrer and reflux condenser.
浪费时间
发表于 2025-3-25 22:07:57
http://reply.papertrans.cn/89/8843/884255/884255_25.png
左右连贯
发表于 2025-3-26 03:07:27
http://reply.papertrans.cn/89/8843/884255/884255_26.png
清楚说话
发表于 2025-3-26 04:53:18
Methyl 2-Furoate,A. A solution of 224 g (2 moles) of 2-furoic acid . p. 43), m.p. 128–132°, in 500 ml of methanol was placed in a one-liter flask fitted with a reflux condenser and a glass tube, which passed to the bottom of the flask.
污秽
发表于 2025-3-26 10:30:02
5-Methyl-2-Furoic Acid,A mixture of 14 g (0.1 mole) of methyl 5-methyl-2-furoate (see p. 23), b.p. 97–99°/12 mm, and 22 ml of 22% aqueous sodium hydroxide solution was prepared in a 100-m1 round-bottomed flask fitted with mercury-sealed stirrer and reflux condenser.
cinder
发表于 2025-3-26 13:00:47
5-(Propoxymethyl)-2-Furoic Acid,Ground sodium hydroxide (35 g) was added with stirring to 96% alcohol (130 ml) contained in a 500-ml three-necked round-bottomed flask fitted with mercury-sealed stirrer, reflux condenser, and dropping funnel. With continued stirring, 61 g (0.3 mole) of methyl 5-(propoxymethyl)-2-furoate (see p. 25), b.p. 146–148°//12 mm, was added gradually.
GONG
发表于 2025-3-26 18:47:11
http://reply.papertrans.cn/89/8843/884255/884255_30.png