查询词典 Q-factor

At last,a convergent and general protocol to marine natural product,as demonstrated by the enantioselective total synthesis of malyngamides O,P,Q,R, 5"-epi-Q and 5"-epi-R bearing terminal vinylic chloride structure,was developed in detail.E,(7S)-7-methoxytetradec-4-enoic acid was prepared using the above described Johnson-Clainsen rearrangement,the terminal vinyl chloride was constructed using Wittig reaction as key step,the pyrrolidone derivative was constructed using L-serine as natural chiral pool.Starting from the synthesis of malyngamides O and P to explore the general route,an aldol reaction of methyl acetate with the vinyl chloride part in the presence of LDA gave the skeleton of amine portion,followed by amidation with the fatty acid finished the synthesis of malyngamide P.

先以malyngamides O和P为试点探索通用合成路线，将乙酸甲酯和烯氯部分在LDA存在下进行aldol反应得到氨部分的骨架，再将手性不饱和脂肪酸和氨部分进行酰胺化反应完成了malyngamide P的合成，将P在碱性条件下进行烯醇甲基化反应完成了malyngamide O的全合成。

Although this solution may3 X6 I X' a5 S5 Q annoy a few tourists in the short term, it will reduce the number of5 X# \; h- K/ i8 q# s people using the beaches and will raise money for replenishing the sand..

尽管这一解决方案会在短期内触怒少量游客，它将会减少使用海滩的人数并增加补充沙子的资金。

X. ~ q, C; T w# h8 q王建民加油站 After Melky Cabrera blooped a single, Hernandez struck out Craig Wilson for the inning's first out.

在牛奶小飞球形成一垒安打后，赫南德兹三振了排球威尔森，而这不过是第一个出局数。

A kittening box I use an under-the-bed sweater box.

一个装小猫的盒子（我用的是放在床底下的装毛衣的盒子）聊狗网q#a''2Y'-q

Q ?8 f0 q# j% t, L The molecules(3 responsible for the characteristic leathery, plastic aroma that suffuses(4) new cars are known as volatile(5) organic compounds.

F 新车中皮革、塑料的味道是一种挥发性有机化合物。

Immediately stand the panel in the constant-temperature cabinet or drying room, in a vertical position, with the strips of paint horizontal and with the thickest film at the bottom of the panel.

V& r1 E& Q！ s ~5 c0 ~ j3 Q 立即把玻璃板竖立起来放在恒温箱或干燥房间内，保持竖立状态。

Rain makes bowstrings slacks, and after a march in the wet arrow—feathers flake off.1 S+ Y* y Q- x3 U; q; z3 C

下雨可以让弓弦松弛，在雨天行军以后，箭羽往往会脱落。

Am ashamed to be American because of the association with uneducated, narrow-minded dimwits like you!

Q； {$ 2 Q 我觉得做美国人很丢脸，就是因为你们这些胸无点墨小肚鸡肠的SB！

M: Z |; q, Q You can stick paper with paste made of flour and water.

你可以用面粉和水调制成浆糊把纸粘起来。

In this thesis, we first discuss the origin of the non-Galilean invarianceterm in the usual effective one gluon exchange q-q interaction and.

在本文中，我们首先讨论了等效的单胶子交换势中的非伽利略不变项的起源，并指出将伽利略不变性作为相互作用。。。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。