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qiaozhi

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5-Bromfurfural (7)
Zur LOsung yon 28.8 g (300 mmol, 24.8 ml, d = 1.16 kg'1-1) frisch dest. Furfural mad j e einer Spatelspitze Hydrochinon mad Schwefel in 120 ml 1,2-Dichlorethan tropft man in der Siedehitze 57.5 g (360 mmol, 18.4 ml) Brom in 150 ml 1,2-Dichlorethan innerhalb von 3 h zu und erhitzt weitere 12 hunter RiickfluB. Nach dem Abziehen des Solvens wird ein schwarzbraunes Ol erhalten, das zur Reinigung mit Wasserdampf destilliert wird. Die Olbadtemperatur darf hierbei nicht h6her als 100 ¡ãC sein. In der Vorlage kristallisiert im Eisbad das 5-Bromfurfural 7 in gelben Nadeln aus. Umkristallisation aus wal3rigem 50%igen Ethanol liefert 7 als farblose Nadeln, Schmp. 80-81 ¡ãC, Ausb. 20.0 g (115 mmol, 38 %). (Lit. 4 : Schmp. 82 ¡ãC, Ausb. 61%).

[ Last edited by zzgyb on 2008-7-15 at 17:05 ]
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ɽºËÌÒ

½ð³æ (ÕýʽдÊÖ)

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qiaozhi(½ð±Ò+10,VIP+0):Ìṩ·­Òë
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5-Bromfurfural (7)
To LOsung yon 28.8 g (300 mmol, 24.8 ml, d = 1.16 kg'1-1) freshly distilled. Furfural mad one Spatelspitze Hydroquinone mad sulphur in 120 ml of 1,2-dichloroethane drips in the Siedehitze 57.5 g (360 mmol, 18.4 ml) bromine in 150 ml of 1,2-dichloroethane within 3 h and cooked another 12 hunter RiickfluB . After subtracting the Solvens a schwarzbraunes Ol get used to cleaning with distilled water vapor. The Olbadtemperatur may not h6her than 100 ¡ã C. In the template crystallized ice bath in the 5-Bromfurfural 7 in yellow needles. Umkristallisation from wal3rigem 50% ethanol supplies 7 as colorless needles, Schmp. 80-81 ¡ã C, educ. 20.0 g (115 mmol, 38%). (Lit 4: Schmp. 82 ¡ã C, educ. 61%
2Â¥2008-06-23 14:40:46
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zhanglizhi

Òø³æ (ÕýʽдÊÖ)

Ö§³Öһ¥£º


5-Bromfurfural (7)
To LOsung yon 28.8 g (300 mmol, 24.8 ml, d = 1.16 kg'1-1) freshly distilled. Furfural mad one Spatelspitze Hydroquinone mad sulphur in 120 ml of 1,2-dichloroethane drips in the Siedehitze 57.5 g (360 mmol, 18.4 ml) bromine in 150 ml of 1,2-dichloroethane within 3 h and cooked another 12 hunter RiickfluB . After subtracting the Solvens a schwarzbraunes Ol get used to cleaning with distilled water vapor. The Olbadtemperatur may not h6her than 100 ¡ã C. In the template crystallized ice bath in the 5-Bromfurfural 7 in yellow needles. Umkristallisation from wal3rigem 50% ethanol supplies 7 as colorless needles, Schmp. 80-81 ¡ã C, educ. 20.0 g (115 mmol, 38%). (Lit 4: Schmp. 82 ¡ã C, educ. 61%
3Â¥2008-06-23 18:06:43
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magic_z820

½ð³æ (ÕýʽдÊÖ)

magic_z

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qiaozhi(½ð±Ò+10,VIP+0):Ìṩ·­Òë
ÎÒÊÔÊÔ°É£¬
28.8 g (300 mmol, 24.8 ml, d = 1.16 kg'1-1£©ÐÂÕô¹ýµÄ߻ૼ×È©ºÍÉÙÁ¿µÄÁò´ú¶Ô±½¶þ·ÓÈÜÓÚ120ml1£¬2-¶þÂÈÒÒÍ飬3h½«ÆäµÎ¼ÓÖÁ57.5gäå/150ml1£¬2-¶þÂÈÒÒÍéµÄ·ÐÌÚµÄäåÒºÖУ¬È»ºó¼ÓÈÈ»ØÁ÷12h£¬·´Ó¦Íê³ÉÕô³öÈܼÁµÃµ½ºÚºÖÉ«ÓÍ×´ÎÔÙ½øÐÐË®ÕôÆøÕôÁóÌá´¿£¬ÓÍԡζȲ»³¬¹ý100¡æ¡£×îºó¿ÉÒԵõ½5-äå´ú߻ૼ×È©µÄ»ÆÉ«Õë×´¾§Ìå¡£ÓÃ50%µÄÒÒ´¼Òº½øÐÐÖØ½á¾§µÃµ½ÎÞÉ«µÄÕë×´½á¾§£¬·Ðµã,80-81¡æ£¬²úÂÊ20.0 g (115 mmol, 38 %)¡££¨ÎÄÏ×4£º·Ðµã£¬82¡æ£¬²úÂÊ£¬62%£©
Nopain,Nogain!
4Â¥2008-06-24 19:15:19
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