烯酮

In the first step of thedouble annulation route, 2-amino-3-carbamoyl-5,6-dihydro-4-pyridones 2 werecreated in high to excellent yields by a formal [5C + 1N] annulation reaction ofketene--acetals 1 with ammonia.

第一步，二硫缩烯酮1和氨源通过[5C + 1N]加成反应产率极高的得到了2-氨基-3-氨基甲酰基-5，6-二氢-4-吡啶酮2。

Objective: To observe the effects of levonorgestrel-releasing intrauterine device and gestrinone on pain relief after therapy of endometriosis and prevention of the disease recurrence.

目的：观察左炔诺孕酮宫内节育器与孕三烯酮用于子宫内膜异位症术后治疗疼痛和防止复发的疗效。

Depending upon reaction conditions, the product may be a polyketone formed b y addition polymerization of the ketene double bond

随着反应条件的不同，产物可以是由烯酮的双键加成聚合得到的聚酮。

The crude toxin of scabby wheat contained deoxynivalanol 11100 ppm and zearalenonel 605 ppm.

赤霉病麦粗毒素为赤霉病麦的乙醇提取物，其中脱氧雪腐镰刀菌烯醇和玉米赤霉烯酮含量分别为11100 ppm和605ppm。

In addition,α-alkenoyl ketene--acetals mainly used as the synthons of 3C and 5C, theα-functionalized reactions of which just limited on some simple reactions, as bromination, nitration, acetylation. However, the understanding of the forming of C-C bond atα-position is far from enough.

另外，对于α-烯酰基二硫缩烯酮的研究则主要集中在其作为3C或5C合成子的研究上，其α-位的官能化研究只是停留在溴化、硝化、脱羧等简单的反应之上，而对α-位C-C键的形成还缺乏足够的认识。

P-Isopropylphenol was synthesized by catalytic transfer dehydrogenation with 5% Pd/C using 4-isopropylcyclohexenone as the material and the hydrogen offer, industrial dipentene as the hydrogen acceptor and the solvent.

采用5%Pd/C作为转移氢催化剂，4-异丙基环己烯酮为氢给予剂，工业双戊烯为氢接受剂和溶剂进行反应，合成了对异丙基苯酚。

The oil pressed from the fruits after distilling litsea cubeba can be used to produce lauric acid and glycerin,etc..

其次是宁稀、茨烯、甲基庚烯酮、香叶醇等。

The above view of isomerization between the structure of olefine alcohol and olefine ketone can succeed to explain that the structure and properties of C〓 Fullerols change with the pH value of its solution.

作者提出的上述富勒醇的结构以及烯醇与烯酮的互变异构的观点能成功地解释C〓、C〓富勒醇的结构随其溶液pH值的变化而发生变化的现象。

Head blight not only causes the severe grain yield loss, but also causes the harvested grain contaminated with several mycotoxins, such as deoxynivalenol and zearalenone. The consumption of food product made from grains contaminated with these toxins is a potential problem for human and farm animals, which is known to cause carcinogenic, genotoxic acute or chronic diseases or to directly target the kidney, liver or immune system, and has caused great concern of food safety.

赤霉菌引起小麦的穗腐，不仅使小麦籽粒产量降低、品质变劣，而且病麦粒中存留有病菌产生的真菌毒素，如脱氧雪腐镰刀菌烯醇(Deoxynivalenol，DON)和玉米赤霉烯酮(Zearalenone，ZEN)，食用污染毒素的病麦及其制成品后会引起人畜中毒，还有致癌、致畸和诱变的作用。

Isoquinuclidines are structural elements of numerous alkaloids and can be prepared from the reaction of imines with cyclohexenone.

isoquinuclidines结构性因素众多生物碱可制备烯合成环己烯酮与亚胺反应。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。