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phyweiw
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
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- ¹ó±ö: 0.155
- ½ð±Ò: 5142
- É¢½ð: 130
- ºì»¨: 4
- ɳ·¢: 1
- Ìû×Ó: 1191
- ÔÚÏß: 151.1Сʱ
- ³æºÅ: 459063
- ×¢²á: 2007-11-14
- רҵ: ½á¹¹ÌÕ´É
2Â¥2009-11-25 20:59:01
phyweiw
Ìú¸Ëľ³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 5
- Ó¦Öú: 3 (Ó×¶ùÔ°)
- ¹ó±ö: 0.155
- ½ð±Ò: 5142
- É¢½ð: 130
- ºì»¨: 4
- ɳ·¢: 1
- Ìû×Ó: 1191
- ÔÚÏß: 151.1Сʱ
- ³æºÅ: 459063
- ×¢²á: 2007-11-14
- רҵ: ½á¹¹ÌÕ´É
¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
limeng2317(½ð±Ò+2,VIP+0): 11-26 16:54
zap65535(½ð±Ò+4,VIP+0):²¹·¢ 12-22 00:34
limeng2317(½ð±Ò+2,VIP+0): 11-26 16:54
zap65535(½ð±Ò+4,VIP+0):²¹·¢ 12-22 00:34
|
ûÈ˰ïæÂð£¬ÎÒÀ´ÊÔÊÔ¡£ To dissolve 12.2 g newly-distilled salicylaldehyde into appropriate amount absolute ethanol, and then slowly drop 45 ml Br2-CCl4 solution with concentration of 20% into the as-prepared salicylaldehyde solution accompanied by stirring with the temperature kept between 12-15 degree. After that, continue to stir the solution for 45 min followed by keeping it at RT for 2h until the white deposition separates out. Extract the deposited material and wash them with absolute ethanol several times to obtain the white crystals. |
3Â¥2009-11-25 21:50:47














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