| ²é¿´: 825 | »Ø¸´: 2 | ||
caofy200707ľ³æ (ÕýʽдÊÖ)
|
[ÇóÖú]
Çó¸ßÈË·Ò룡£¡£¡£¡ ÒÑÓÐ1È˲ÎÓë
|
| The strong rate acceleration observed in the thermal rearrangement of traps-9-decalyl-peroxybenzoate to 1-benzoyloxy-l,6-epoxycyclodecane with increasing solvent polarity (rate factor ca. 102) is in accordance with the postulated heterolytic O-O bond cleavage leading to a dipolar activated complex.The decomposition of traps-9-decalyl-peroxyphenylacetate (no. 10 in Table 5-9) is an interesting borderline reaction. Depending on the reaction medium, either the hetero-cyclic Criegee mechanism or the homolytic fragmentation mechanism can be observed[207]. In alcohols, the decomposition occurs mainly by the heterolysis pathway, whereas in nonpolar solvents like ethylbenzene, the homolysis pathway predominates. In aceto-nitrile, both mechanisms compete, as evidenced by the product distribution. The thermolysis of this particular perester is thus an impressive example of the strong influence which solvents may have, not only on reaction rates but also on the mechanism of achemical reaction (cf. Section 5.5.7 for further examples). In addition, it should be mentioned that peresters such as tert-butyl cycloheptatrieneperoxycarboxylate undergo heterolytic fragmentation if the reaction is acid-catalyzed [195, 212]. The base-catalyzed ionic fragmentation of tert-butyl peroxyformate has already been entioned [110]; cf.Eq. (5-39b). |
» ²ÂÄãϲ»¶
272·Ö²ÄÁÏ×ÓÇóµ÷¼Á
ÒѾÓÐ36È˻ظ´
275Çóµ÷¼Á
ÒѾÓÐ8È˻ظ´
µ÷¼ÁÇóÊÕÁô
ÒѾÓÐ5È˻ظ´
Ò»Ö¾Ô¸211£¬»¯Ñ§Ñ§Ë¶£¬310·Ö£¬±¾¿ÆÖصãË«·Ç£¬Çóµ÷¼Á
ÒѾÓÐ20È˻ظ´
070300»¯Ñ§Ñ§Ë¶311·ÖÇóµ÷¼Á
ÒѾÓÐ19È˻ظ´
²ÄÁÏÓ뻯¹¤µ÷¼Á
ÒѾÓÐ13È˻ظ´
²ÄÁÏÓ뻯¹¤µ÷¼Á
ÒѾÓÐ33È˻ظ´
¸´ÊÔµ÷¼Á
ÒѾÓÐ7È˻ظ´
Ò»Ö¾Ô¸¹þ¹¤´ó 085600 277 12²Ä¿Æ»ùÇóµ÷¼Á
ÒѾÓÐ17È˻ظ´
»¹Óл¯¹¤¶þÂÖµ÷¼ÁµÄѧУÂð
ÒѾÓÐ47È˻ظ´
» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:
ÎÄÕ»ظ´Ð¡ÐÞ£¬µ«ÊDz»Ì«Ã÷°×Éó¸åÈ˵ÄÕ⼸¸öÎÊÌ⣬Çó¸ßÈ˽âÊÍÏ£¬Ð»Ð»£¡
ÒѾÓÐ7È˻ظ´
ÀëÐÄ»úת×ÓÄÜͨÓÃÂ𣿣¿
ÒѾÓÐ5È˻ظ´
Çó¿ÚÇ»ÖÖÖ²¸ßÊÖ·Òë
ÒѾÓÐ5È˻ظ´
Çó¸ßÊÖ°ïæ·ÒëÏ£¬¹ØÓÚ×èȼ¼ÁµÄ¡£¡£¡£Íò·Ö¸Ðл~~£¡
ÒѾÓÐ2È˻ظ´
ÇóÖ¸µã·ÒëÒ»¸ö±êÌ⣬²»¶®Ôõô¡±×é×°¡°¡£¡£¡£¡£
ÒѾÓÐ10È˻ظ´
Çó¸ßÊÖ°ïæ¿´Ò»¶ÎÓ¢ÎÄ£¬Éæ¼°µ½Êý¾Ý·ÖÎöÎÊÌ⣬ÈçÄܸø³ö˵µÃͨµÄÈ«ÎÄ·ÒëÁíÓÐ50BBÏàÔù
ÒѾÓÐ5È˻ظ´
Çó·ÒëһС¶ÎÈÕÓï
ÒѾÓÐ2È˻ظ´
¹ØÓÚÀëÐÄ»ú¼°rpmµ¥Î»Óëg(RCF)µ¥Î»µÄ»»Ëã
ÒѾÓÐ136È˻ظ´
¹òÇóÓ¢Óï´ïÈË·ÒëÒ»ÏÂÕâ¸ö¼ÆËãʽ
ÒѾÓÐ4È˻ظ´
ÇóÖú¸ßÊÖ½«ÒÔÏÂCÓïÑÔ·ÒëΪMatlabÓïÑÔ£¬¼±¼±¼±£¡
ÒѾÓÐ12È˻ظ´
·ÒëÒ»¾ä¹ØÓÚ̼ÄÉÃײÄÁϵÄÎÄÏ×£¬±¾È˲»ÊǸ߷Ö×ÓרҵµÄ£¬Âß¼²»ÊǺÜÇå³þ£¬Ñ°¸ßÊÖÇó½â
ÒѾÓÐ5È˻ظ´
ÀëÐÄ»úÀïÃæ½øÁËËé²£Á§Ôõô°ì£¿
ÒѾÓÐ8È˻ظ´
¸Õ×öµÄGPCͼÆ×£¬THF£¬Çó¸ßÊÖ¸øÐ©½âÊÍ
ÒѾÓÐ19È˻ظ´
Çó¸ßÊÖ½«ÒÔÏÂcomputational method·Òë³ÉÖÐÎÄ£¬×¨ÒµÊõÓïÌ«¶à²»ÖªµÀÔõô·Òë
ÒѾÓÐ11È˻ظ´
Çó¸ßÈË·ÒëÒÔϾä×Ó£¬²»¶®ÀïÃæµÄÀëÐÄ»úµÄתËÙ»¹ÓÃg
ÒѾÓÐ4È˻ظ´
ÉÏת»»ºÏ³ÉºóµÄÀëÐÄÏ´µÓʱ£¬Ôõôµ÷½ÚÀëÐÄ»úµÄתÊýºÍÀëÐÄʱ¼ä
ÒѾÓÐ4È˻ظ´
¡¾ÇóÖú¡¿Ó¢Óï¸ßÊÖ¸ø°ïæ·Òë³ÉÖÐÎİɣ¡£¡ÕÒ¸ö¸ßÊÖÀ´ÊÔÒ»ÊÔ
ÒѾÓÐ10È˻ظ´
¡¾ÇóÖú/½»Á÷¡¿ÇëÎʸßÊÖ£º×ªÂ¼ºóµ÷½ÚºÍ·Òëºóµ÷½ÚµÄÇø±ð
ÒѾÓÐ5È˻ظ´
Çë¸ßÈ˽øÀ´Ö¸µãһϣº·ÂÕÕһƪӢÎİÑ×Ô¼ºµÄÖÐÎÄÎÄÕ·Òë³ÉÁËÓ¢ÎÄ£¬Ëã²»Ëã³Ï®£¿£¿
ÒѾÓÐ16È˻ظ´
¡¾ÇóÖú¡¿Çó¸ßÈ˽âÊÍÒ»ÏÂGPC²â³öµÄÕâЩÊý¾Ý¸÷´ú±íµÄÒâ˼£¡
ÒѾÓÐ8È˻ظ´
¼±£¡ÐÞ¸ÄÖÐÒëÓ¢£¬ÎÒÒѾ·ÒëÁË£¬Çë¸÷λ¸ßÊÖ°ïæÐÞ¸ÄÏ¡£
ÒѾÓÐ4È˻ظ´
ÇëÇó¸ßÈË·ÒëÒ»¸öAnsysÃüÁîÁ÷£¨Ô½ÏêϸԽºÃ£©
ÒѾÓÐ5È˻ظ´
by a factor of two to six Ôõô·Òë
ÒѾÓÐ15È˻ظ´

¾¨ÓãÏÈÉú
ľ³æ (ÖøÃûдÊÖ)
Ò»Ìõ´óÓã
- Ó¦Öú: 75 (³õÖÐÉú)
- ½ð±Ò: 2023
- É¢½ð: 34
- ºì»¨: 13
- ɳ·¢: 1
- Ìû×Ó: 1718
- ÔÚÏß: 202.2Сʱ
- ³æºÅ: 882772
- ×¢²á: 2009-10-24
- ÐÔ±ð: GG
- רҵ: ½ðÊô¹¦ÄܲÄÁÏ

2Â¥2014-04-27 17:25:31
»·±£Ð¡ÎÀÊ¿
ľ³æ (ÕýʽдÊÖ)
- SFL-EPI: 1
- Ó¦Öú: 6 (Ó×¶ùÔ°)
- ½ð±Ò: 1653.1
- É¢½ð: 558
- ºì»¨: 7
- Ìû×Ó: 645
- ÔÚÏß: 106.2Сʱ
- ³æºÅ: 3110067
- ×¢²á: 2014-04-02
- ÐÔ±ð: GG
- רҵ: »·¾³¹¤³Ì

3Â¥2014-04-28 00:15:22













»Ø¸´´ËÂ¥