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lxqchain

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[ Last edited by lxqchain on 2011-6-30 at 12:40 ]
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James-CG

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lxqchain(½ð±Ò+20): 1 2011-06-30 14:03:21
jiangchunyong(½ð±Ò+1): лл 2011-06-30 14:30:12
First, Formation of C-C-C-O-B, cis-  ring
Then  Oxidation to remove B to form trans-  structure
2Â¥2011-06-30 13:56:19
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

James-CG

ľ³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

First,  Formation of  -C-C-C-O-B-,  cis- (B and COBn), cyclic ring
Then Oxidation to remove B to form trans-  structure
3Â¥2011-06-30 13:58:45
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lxqchain

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
Originally posted by James-CG at 2011-06-30 13:58:45:
First,  Formation of  -C-C-C-O-B-,  cis- (B and COBn), cyclic ring
Then Oxidation to remove B to form trans-  structure

ÔÙÎÊһϣ¬Ä¿Ç°ÓÐÀàËÆµÄÊÖÐÔÊÔ¼Á¿ÉÒÔÓÃÓÚÕâÀà·´Ó¦Âð
4Â¥2011-06-30 14:04:41
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

James-CG

ľ³æ (ÕýʽдÊÖ)

Borane reagent is so typical, other chiral borane reagent should go the same way, but ee, depending on the ligand on borane. IPC is one of the best, very bulky and stable
5Â¥2011-06-30 14:10:48
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

James-CG

ľ³æ (ÕýʽдÊÖ)

In this reaction, coordination of Borane to O  (OBn) is the key to set the stereochemistry
6Â¥2011-06-30 14:12:33
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lxqchain

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
Originally posted by James-CG at 2011-06-30 14:10:48:
Borane reagent is so typical, other chiral borane reagent should go the same way, but ee, depending on the ligand on borane. IPC is one of the best, very bulky and stable

лл ¿´À´ÄѰ¡ ÎÒÃÇÀϰåÒªÎÒÔÚÕâ¸ö»ù´¡ÉÏŪµã³É¹û³öÀ´ Ôõô½»´ú°¡
7Â¥2011-06-30 14:13:36
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

James-CG

ľ³æ (ÕýʽдÊÖ)

You could change the IPC to other alcohols like derivatives from tatarates, etc.
8Â¥2011-06-30 14:17:20
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lxqchain

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
Originally posted by James-CG at 2011-06-30 14:17:20:
You could change the IPC to other alcohols like derivatives from tatarates, etc.

ÄúËù˵µÄ¡° tatarates¡±ÊÇÄÄÒ»À࣬ÎÒÔÝʱûËѵ½ËüµÄÏà¹ØÐÅÏ¢£¬Ò²²»Ì«Á˽⣬ÄÜÉÔ΢½éÉÜÒ»ÏÂÂð ºÃÈÃÎÒÄܾßÌåµÄÈ¥²éһϠÍò·Ö¸Ð¼¤
9Â¥2011-06-30 14:25:55
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

James-CG

ľ³æ (ÕýʽдÊÖ)

tartaric acids, less expensive
10Â¥2011-06-30 14:27:01
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ lxqchain µÄÖ÷Ìâ¸üÐÂ
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