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wangjieru

½ð³æ (СÓÐÃûÆø)

[ÇóÖú] Âé·³¸÷λ°ïÎÒ·­ÒëÒ»ÏÂÏÂÃæÒ»¶ÎµÂÎÄÎÄÏ×£¬¼±Óã¬Ð»Ð»¸÷λÀ²£¡£¡£¡

yridin-~arbonsiiure-(2)-athylesters):  Im  16-l-Gefa5 werden 100  g  r-Picolin zur  Losung von
1170 g  KMn04  in  16  I  Wasser  gegeben, die  Oxydation  durch  Erwarmen  in Gang gebracht
und  langsam  weitere 225  g a-Picolin  zugegeben,  wobei  gut  gekuhlt  werden muD. Unter  Zu-
gabe der  gleichen  Mengen wird dieser Vorgang  wiederholt.  Nach dem Absaugen des  Mangan-
dioxydhydrats dampft man auf  1/3  des  Vol. ein,  macht  rnit  verd. Salzsaure (1  :  1)  kongosauer
und  dampft zur  Trockne  ein.  Den sirupasen Ruckstand kocht  man  1  Stde. rnit  Athanol, saugt
hei5 ab und  wiederholt  das  Auskochen. Beim Eindampfen der  alkohol.  Losung  erhalt man
440 g  (Ausb.  5 1  % d. Th.) Picolinsaure,  die  fur  die  Veresterung  rein  genug ist.  200  g rohe,
lufttrockene  Saure  werden rnit  340 ccm  absol.  bithanol  und  400 ccm  konz.  Schwefelsaure
4 Stdn.  gekocht.  Man ruhrt  in 2  kg Eis ein,  fugt  sogleich  250  g  Kristallsoda zu und  macht
rnit  550  ccm  Ammoniak alkalisch.  Durch  Abtrennen  des  01s und  Ausathern  erhalt  man
123  g Ester  (Ausb. 51 % d. Th.). Sdp.22  131  -  132".

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barbarasong

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wangjieru: ½ð±Ò+15, ·­ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2013-04-21 11:41:23
Ethyl pyridine-2-carboxylate:

In 16L reactor, the 1170g of KMnO4 is dissolved into 16L water. And 100g 2-Picoline is chargedi into the solution. The oxidation reaction is exothermic and the reaction mixture is warmed. After the oxidation is finished, 225g 2-picoline is added carefully with good cooling system is necessary. After addition, another eauql quantity of 2-picoline(100 + 225 =325g) is added.

After the reaction is completed, the mixture is filtered, left ca.1/3 volume as cake, then washed with HCl:Congo acid(1:1), and then dried.

The syrup dired cake is heated to reflux in ethanol for 1 hour, filtered under hot condition. The filter cake is boiled in ethanol again and filtered under hot conditions. The mother liquor is concentrated, 440g of pyridine-2-carboxylic acid (51% yield, theoretical:859g) is obtained.

200g air dried crude product is dissolved into 340mL ethanol and added into 400mL Conc.H2SO4, heated to reflux for 4 hours. After reaction is finished, it is poured into 2kg ice, and adjusted to basic with 250g Na2CO3 and 500mL NH3 H2O.

The oil is separated and concentrated to produce 123g of ester (51% yield, theoretical: 245g).

Sdp.22  131-132¡æ £¨This should be bp under vacuum£©
2Â¥2013-03-21 14:10:07
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