²é¿´: 1713  |  »Ø¸´: 18

¿§·ÈniuÄÌÌÇ

гæ (³õÈëÎÄ̳)


[½»Á÷] Éó¸åÈËÒªÇ󻨴ð¹ØÓÚ²úÂʵÄÎÊÌ⣬ÈçºÎ»Ø´ð

JMCµÄÉó¸åÈËÌá³öÒªÇó˵Ã÷Ôì³É²úÂʸߵ͵ÄÔ­Òò¡£ÎÄÕÂÖеϝºÏÎïÊÇͬһ¸öϵÁе쬻úÀíÏàͬ£¬¸÷¸ö»¯ºÏÎïÖ®¼äÔںϳɲ½ÖèµÄ²úÂÊÏà²îÓ¦¸Ã²»´ó£¬Ö÷ÒªµÄ²î±ð¾ÍÔÚÓÚÖØ½á¾§ºóµÃµ½´¿Æ·µÄ²úÁ¿¶àÉÙ²îÒ죬¼°¹ýÖù×ÓʱÒò¹ýÖù¼¼ÊõÎÊÌâÔì³ÉÁË×îÖÕ´¿Æ·µÄ²î±ð¡£µ«ÊÇÄѵÀÒªÒÔÕâÑùµÄÀíÓɻشðÂð£¿Éó¸åÈ˵ÄÔ­»°ÊÇÕâÑùµÄ£ºThe authors claim that the chalcone-based spiroheterocycles were obtained in yields ranging from 10% to 95% after purification. Please explain what causes the low yields of compounds such as 2e and 5k. ÇëÎʸ÷λ´óÉñÕâÑùµÄÎÊÌâÒªÈçºÎ»Ø´ð£¿
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

caledonian

½ûÑÔ (ÎÄ̳¾«Ó¢)

¡ï
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
±¾ÌûÄÚÈݱ»ÆÁ±Î

5Â¥2015-03-18 19:02:52
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

angocn

ÖÁ×ðľ³æ (ÎÄ̳¾«Ó¢)


¶¥Ò»¸ö
16Â¥2015-03-18 19:12:57
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

angocn

ÖÁ×ðľ³æ (ÎÄ̳¾«Ó¢)


°´ÕæÊµÇé¿ö»Ø´ð¡£
17Â¥2015-03-18 19:14:04
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
¼òµ¥»Ø¸´
dmbb2Â¥
2015-03-18 18:57   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
ZloveA3Â¥
2015-03-18 19:02   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
×£¸£
ZloveA4Â¥
2015-03-18 19:02   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
×£¸£
caledonian6Â¥
2015-03-18 19:03   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
roubao7Â¥
2015-03-18 19:03   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
roubao8Â¥
2015-03-18 19:04   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
tzynew9Â¥
2015-03-18 19:07   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
tzynew10Â¥
2015-03-18 19:07   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
huanghe71811Â¥
2015-03-18 19:09   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
huanghe71812Â¥
2015-03-18 19:09   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
2015-03-18 19:09   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
zjlbnsdmm14Â¥
2015-03-18 19:10   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+3): лл²ÎÓë
2015-03-18 19:12   »Ø¸´  
¿§·ÈniuÄÌÌÇ(½ð±Ò+1): лл²ÎÓë
star_zhang18Â¥
2015-03-18 19:22   »Ø¸´  
×£¸£
ФÁÁ×Ó19Â¥
2015-03-18 19:30   »Ø¸´  
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ ¿§·ÈniuÄÌÌÇ µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] ÊÛSCIÒ»ÇøÎÄÕ£¬ÎÒ:8.O.55.1.O.54,¿ÆÄ¿ÆëÈ«,¿ÉÙ¤¼± +6 ASdOkHsho7FD 2026-08-28 9/450 2026-08-29 11:18 by jCd0dEvKHShX
[˶²©¼ÒÔ°] ÊÛSCIÒ»ÇøT0PÎÄÕ£¬ÎÒ:8.O55.1.O.54,¿ÆÄ¿È«,¿ÉÊ®¼± +3 ASdOkHsho7FD 2026-08-28 8/400 2026-08-29 11:17 by jCd0dEvKHShX
[»ù½ðÉêÇë] 2026ÄêÒ¶ÆóËï»ù½ð +4 bud_bud 2026-08-27 7/350 2026-08-29 07:23 by foolishmani
[»ù½ðÉêÇë] ϵͳ²é²»µ½ +11 ¶­°Ëǧ 2026-08-26 11/550 2026-08-28 18:06 by Leogzhya
[»ù½ðÉêÇë] ÓÐûÓÐÈÔûÊÕµ½ÐÅÏ¢µÄ +3 µÂÉÐÖÐÐÐ 2026-08-27 3/150 2026-08-28 15:24 by rongshuxia
[½Ìʦ֮¼Ò] µ¼Ê¦Í²ۣºÎÒÔõô̯ÉÏÁËÕâô¸ö¼«Æ·Ñо¿Éú£¡ +8 ËÕ¶«ÆÂ¶þÊÀ 2026-08-23 8/400 2026-08-28 14:41 by lkforward
[»ù½ðÉêÇë] »ù½ð²»ÖУ¬¹²Ãã +11 eulota 2026-08-26 11/550 2026-08-28 14:22 by »ðÐdz¬ÈËxi
[»ù½ðÉêÇë] »ù½ðϵͳʲôÄÚÈÝҲûÓÐ 30+4 winsaint 2026-08-27 9/450 2026-08-28 11:06 by maolC
[»ù½ðÉêÇë] Ôõô²é°¡ +6 huang1991js 2026-08-26 6/300 2026-08-28 08:42 by winsaint
[»ù½ðÉêÇë] ÃæÉϺÏ×÷µ¥Î»¸ÇÕ +5 ssyjh 2026-08-27 5/250 2026-08-27 20:50 by gdfollow
[»ù½ðÉêÇë] ÉêÇëɾ³ý±¾Ìû +6 lyz123lyz 2026-08-27 7/350 2026-08-27 17:31 by Äþ¾²ÖÂÔ¶sy
[»ù½ðÉêÇë] Ôõô¿´Çà»ùÖÐÁËûÓа¡ +5 Ò¶¾Å΢ 2026-08-26 5/250 2026-08-27 10:35 by l_zh2008
[»ù½ðÉêÇë] 2026Äê8ÔÂ25ÈÕ¹ú×ÔÈ»·Å°ñǰͻȻÊÕµ½ÁÐÈëÆÀÉóר¼ÒÓʼþ£¬ÓйØÏµÂ𣿠+25 ľˮ˼¶¹ 2026-08-25 28/1400 2026-08-26 14:53 by draco1987
[»ù½ðÉêÇë] Ϊʲô¹ú×ÔÈ»²»ÄÜÖ±½Ó¹«²¼ +4 bjdxyxy 2026-08-26 4/200 2026-08-26 13:12 by qingmu1201
[»ù½ðÉêÇë] ¹úºÏÀïÃæÄÜ¿´µ½ÁË +7 Ò»»³Ü°Çï 2026-08-26 7/350 2026-08-26 11:23 by zhaosm1982
[»ù½ðÉêÇë] ÏîÄ¿ÐÅÏ¢ºÍ¾­·ÑÐÅÏ¢ÔÚϵͳÀï¶¼¿ÉÒÔ¿´µ½ÁË +6 wittyboy 2026-08-26 14/700 2026-08-26 10:55 by wittyboy
[Ö°³¡ÈËÉú] ѧÉúײ¼û¸¨µ¼Ô±ËÍÍâÂô£¬µÚ¶þÌìÈ«°à¶¼³ÁĬÁË +3 ¾¨ÓãÈÚ½ð_Õã½­_É 2026-08-22 3/150 2026-08-26 09:01 by zzuzxg
[»ù½ðÉêÇë] Å£À´£¡Ã×À´£¡ÃæÀ´£¡ +8 beefly 2026-08-26 8/400 2026-08-26 08:37 by xuzhipiao
[»ù½ðÉêÇë] ijЩ»ú¹¹£¬ÒÔЧÂʵÍΪÈÙ£¬ÒÔЧÂʵÍ×÷Ϊ´æÔڸР+9 yuleib84 2026-08-25 10/500 2026-08-25 17:14 by alexon
[»ù½ðÉêÇë] Èç¹û´Ë¿ÌÄãÕýÔÚΪ¹ú»ù¸Ðµ½½¹ÂÇ£¬²»·ÁÀ´ÌýÌýÕâÊס¶»ù½ðÖ®Íâ¡· +8 scalable 2026-08-24 8/400 2026-08-25 12:52 by jnhyjjm
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û