双烯

THE FIRST TOTAL SYNTHESIS OF TAXAMAIRIN B Taxamairin B, representive of rare naturally-occuring rearrang-ed 9(10→20)-abeo-8, 11, 13-triene diterpenoids, has been firstsynthesized by a eleven-step route in an overall yield of 8.19%,starting from commercially available catechol and 1,3-cyclohexan-dione. The improved Friedel-Crafts annulation, thermodynamicallycontrolled-geminal pairing methylation, the selective oxidation ofallyl group and the selective reduction of the less-hindrancecarbon-carbon double bond are the key steps.

二。美丽红豆杉素B的全合成研究 1，美丽红豆杉素B的首次全合成以价廉，易得的邻苯二酚和1，3-环己二酮为原料，经过改良的Friedel-Crafts烷基化反应，热力学控制的α，β-不饱和酮结构的α一位双烷基化，烯丙位的选择性氧化，以及选择性还原位阻较小的碳碳双键等十一步反应，以8.19％的总收率首次完成了美丽红豆杉素B的全合成。

The length of certain bond and the number of conjugate double-bond affected OWF〓 greatly, OWF〓 changed linearly with the change of bond length (for planar azobenzene derivatives and cyanine derivatives) and the change of conjugate double-bond number (for conjugate alkene,β-carotene and lycopene).

3键长和共轭双键数对OWF〓有较大的影响，OWF〓随键长（如平面型的偶氮苯衍生物、菁类和氧杂菁类等）和双键数（如共轭烯烃类、β—胡萝卜素和番茄红素等）的变化而线性变化。

The length of certain bond and the number of conjugate double-bond affected OWFπ-π greatly, OWFπ-π changed linearly with the change of bond length (for planar azobenzene derivatives and cyanine derivatives) and the change of conjugate double-bond number (for conjugate alkene, p-carotene and lycopene).

3键长和共轭双键数对OWF_有较大的影响，OWF_随键长(如平面型的偶氮苯衍生物、菁类和氧杂菁类等)和双键数(如共轭烯烃类、β—胡萝卜素和番茄红素等)的变化而线性变化。

The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为：多氟烷基碘化物在连二亚硫酸钠的引发下，得到自由基R〓，后者加成到二烯丙基乙酸中的一个—C=C—双键上，然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

Amino-2-methylpropanol was utilized as a chemical modifying reagent to modify carboxyl groups in unsaturated fatty acids into nitrogen-containing heterocycles, which effectively suppressed the migration of double bonds of the alkenyl within the electron impact source and led to regular informative mass spectra indicative of the position of the olefinic bonds in the chain.

以2-氨基－2-甲基丙醇为脂肪酸的化学修饰试剂，将不饱和脂肪酸羧基化学修饰试剂，将不饱合脂肪酸羧基化学修饰成含氮杂环，从而避免了链烯基中碳碳双键在EI源中的移动，并使质谱呈现显示双键位置的规范信息。

Selective allylation of the linear, cyclic and mixed diketones in the presence of water by allyl bromide and metallic zinc have been successfully achieved.

本文报道锌参与下水相介质中对称双酮及混合双酮的选择性烯丙基化反应的研究。

The influence of microwave radiation on Ullmann reaction has been investigated by three Ullmann reactions, including triphenylamine formed by treating the diphenylamine with bromobenzene or Chlorobenzene which substitutes Iodobenzene; 4,4\'-dimethyltriphenylamine formed by treating 4,4\'-dimethyldiphenylamine with bromobenzene which substitutes Iodobenzene; 4,4\',4-trinitrotriphenylamine formed by treating 4-chloronitrobenzene with p-nitroaniline in this paper.

实验表明，在微波辐射条件下，顺式比反式迈克尔反应活性高；若在丁烯二酸的双键上引入甲基后，降低了进行迈克尔加成反应的活性；引入酯基对双键的影响比腈基有利于进行迈克尔反应，丙烯酸甲酯较丙烯腈的迈克尔反应活性高。

Exceptionally large nonlinear optical response in C60 had been reported, and diacetylene complexes have the large NLO suspceptibilities, so the novel idea of introducing diacetylene to C60 to improve the NLO suspceptibilities was supposed.

富勒烯具有优良的非线性光学性能，共轭双炔类有机分子有较大非线性光学系数，将C60与双炔类化合物结合在一起设计非线性光学材料是一个有意义的设想。

In this dissertation, electrophilic reactions of Nitrosonium with imines, aza-Diels-Alder reactions of N-arylimines with a variety of electron rich olefinic compounds induced by NO~+, and photoreactions of N-nitrosodiphenylamine with aromatic amines were studied.

本文研究了：(1)NO~+与亚胺双健发生的亲电反应；(2)NO~+引发的芳香亚胺和富电子碳碳双键作为亲二烯体的氮杂Diels-Alder反应，高选择性地得到了一系列四氢喹啉的衍生物；(3)N—亚硝基二苯胺与芳香胺发生光化学反应得到了一系列偶氮苯类化合物。

A new train of thought of copolymerising modification of the boron phenolic resin was applied and a new resin contained allyl was synthesized through allyl phenol, phenol, boric acid and polyformaldehyde.

运用硼酚醛树脂共聚改性的新思路，利用烯丙基苯酚、苯酚、硼酸、多聚甲醛等合成出结构中含有烯丙基活性基团的可与其它含不饱和双键树脂发生共聚反应的新型硼酚醛树脂，表征了它们的物理性能和结构。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。