环丙烷

To test this hypothesis, we measured the effect of IV infusion of the NMDA blockers dizocilpine (MK-801) and-4-(3-phosphonopropyl) piperazine-2-carboxylic acid to decrease the MAC (the minimum alveolar concentration of anesthetic that prevents movement in 50% of subjects given a noxious stimulation) of 8 conventional anesthetics (cyclopropane, desflurane, enflurane, halothane, isoflurane, nitrous oxide, sevoflurane, and xenon) and 8 aromatic compounds (benzene, fluorobenzene, o-difluorobenzene, p-difluorobenzene, 1,2,4-trifluorobenzene, 1,3,5-trifluorobenzene, pentafluorobenzene, and hexafluorobenzene) and, for comparison, etomidate.

为了验证这个假说，我们检测静脉注射 NMDA 阻滞剂 MK-801和 CPP 来降低8种常规吸入麻醉药（环丙烷，地氟醚，安氟醚，氟烷，异氟醚，一氧化二氮，七氟醚和氙）和8种芳香族化合物（苯，氟苯，邻二氟苯，对二氟苯， 1，2，4-三氟苯， 1，3，5-三氟苯，五氟苯和六氟苯的 MAC 值，依托咪酯作为对照组。

Then the protected D-mannitol, mixed with lead tetraacetate, hippuric and acetic anhydride, were refluxed in THF for 18 h in a one-pot two step reaction to afford a chiral precursor-2-phenyl-4-[-2,3-O-]-propylidene-5(4H)-oxazolones.

产物与四乙酸铅、马尿酸、乙酐于THF中回流18 h完成一釜二步反应，纯化后得到含有手性碳原子的环丙烷氨基酸前体-2 苯基-4-[-2，3-O-]丙叉？

Based on the different reaction results with-menthyl,-8-(2-naphthyl)menthyl or-8-phenylmenthyl as the chiral auxiliary, it is was proposed that the possible p -stacking effect between the aryl of chiral auxiliary and dienyl group of α,β-unsaturated esters is involved in the diastereoselectivity of these reactions.

该反应手性辅基易于回收、选择性好，产率高，这一工作为合成多取代的光学活性乙烯基环丙烷衍生物的提供了一种较为简便的方法。

Gerbera plantlets in 125 ml flask received 0, 2.5, 5, 10, 20 ppm Ethrel and 0.01, 0.1, 1 mM 1-aminocyclopropane-1-carboxylic acid to study the effect of ethylene and ethylene biosynthesis through cultured in vitro. The good quality plantlets which had more adventitious roots, no overgown stem, no etiolated plantlets by the addition of 5, 10 ppm Ethrel.

非洲菊(Gerbera jamesonii， Bolus)幼苗於试管内处理以0， 2.5， 10， 20 ppm的益收素及0.01， 0.1， 1 mM的环丙烷氨基羧酸(1-aminocyclopropane-1-carboxylic acid， ACC)以研究乙烯对试管苗之影响及乙烯生合成，结果以5及10 ppm的益收素处理能得到良好品质的苗，为多侧根不徒长，不白化的幼苗。

These products have played an important action in pesticides and pharmic fields, and so on.

环丙烷化合物具有多种生理活性，在农药、药物等方面有很好的应用。

The cyclopropanation reaction of ethylene with samarium carbenoid was studied by means of the B3LYP hybrid density functional method.

用密度泛函B3LYP方法研究了过渡金属钐类卡宾与乙烯的环丙烷化反应的机理。

It is found that the stereochemistry of the reactions of telluronium allylide,crotonylide and trimethylsilyallylide with α,β-unsaturated esters and amides can be tuned by thechoice of reaction conditions.

利用反应条件的变化首次实现了烯丙基、巴豆基、含硅烯丙基碲叶立德与α，β-不饱和酯、酰胺进行环丙烷反应的立体化学调控，能高立体选择性地、高效率地合成两种不同几何异构体中的一个。

Thestercoselectivity of the reaction of propargylide was different completely from that of the reactionof telluronium 3-trimethylsilylalltide with α,β-unsaturaled ketones and trans-trimethysilylacetylenyl-l-benzoyleyelopropane derivatives were obtained.

发现这一反应的立体化学与同样条件下含硅烯丙基碲叶立德和α，β-不饱和酮反应的立体化学完全不同，得到的是又式-2-三甲基硅基乙炔基-1-酮基环丙烷衍生物。

Part Ⅱ: The evelopropanation reactions of both semi-stabilized telluronium and arsoniumylides with α,β--unsaturated ketones proceed smoothly.

第二部分：烯丙基、巴豆基、三甲基硅基烯丙基、肉桂基、苄基碲、胂两种叶立德与α，β-不饱和酮均可以成功地进行环丙烷化反应，并且表现出不同的立体选择性。

This catalyst system was applied in the cyclopropanation of other alkenes, and the results indicated that the catalyst system excelled mono-catalyst.

将这个催化体系用于其他烯烃的环丙烷化，结果表明，协同催化效果优于单一催化体系。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。