异戊烯

The concentrations of isopentane, 2-methyl-pentane, pentane and 3-methyl-pentane which are from automobile exhaust and gasoline evaporation were highest in alkanes. Benzene/toluene ratio was close to 0.5 which is the characteristic value of automobile exhaust. The concentrations of pinene and isoprene were highest in alkenes.

烷烃类物质中异戊烷、2-甲基戊烷、正戊烷和3-甲基戊烷等机动车尾气或汽油挥发特征性物质浓度最高；芳香烃类物质中苯／甲苯的特征比值略高于机动车尾气排放特征比值0.5；烯烃类物质以植物排放的蒎烯、异戊二烯为主。

The major products were methane, ethylene, propylene, butylene, butadiene, cyclopentadiene, benzene, toluene, styrene, vinyl-substituted cyclopentene derivatives and C5/C6 isomers (pentadiene, methyl-substituted cyclopentene derivatives, cyclohexene, hexadiene and methyl-substituted cyclopentadiene derivatives), and the main primary products were determined to be C1～C4 compounds, cyclopentadiene, benzene, toluene and vinyl-substituted cyclopentene derivatives.

热裂解主要产物为甲烷、乙烯、丙烯、丁烯、丁二烯、环戊二烯、苯、甲苯、苯乙烯、环戊烯的乙烯基取代物及C5， C6异构体(戊二烯、环戊烯的甲基取代物、环己烯、己二烯和环戊二烯甲基取代物)，其中， C1～C4、环戊二烯、苯、甲苯、乙烯基取代环戊烯为初始产物。

The major products were methane, ethylene, propylene, butylene, butadiene, cyclopentadiene, benzene, toluene, styrene, vinyl-substituted cyclopentene derivatives and C5/C6 isomers pentadiene, met...

热裂解主要产物为甲烷、乙烯、丙烯、丁烯、丁二烯、环戊二烯、苯、甲苯、苯乙烯、环戊烯的乙烯基取代物及C5，C6异构体(戊二烯、环戊烯的甲基取代物、环己烯、己二烯和环戊二烯甲基取代物)，其中，C1～C4、环戊二烯、苯、甲苯、乙烯基取代环戊烯为初始产物。

Populus alba × berolinensis, Salix babylonica and Quercus mongolica mainly emitted isoprene; Pinus tabulaeformis mainly emitted α-pinene; Ulmus pumila, Gleditsia japonica and Syringa oblate mainly emitted limonene; Ligustrum obtusifolium mainly emitted isoprene, limonene and α-pinene at different time. The highest emission rates were observed for Populus alba × berolinensis and Salix babylonica.

不同树种排放的BVOCs组成明显不同，银中杨、垂柳和蒙古栎以排放异戊二烯为主；油松主要释放α－蒎烯；榆树、皂角和丁香以释放柠檬烯为主；水腊在不同时段其BVOCs组成情况变化较大，主要释放异戊二烯、柠檬烯和α－蒎烯；其中银中杨和垂柳的BVOCs释放量明显高于其它树种。

And the low frequency vibrations contribution from ring A and oxygens to the internal reorganization energy of MQ〓(n=1～7) is greater than 1.60kJ.mol〓 in addition, the low frequency vibrations contribution from the isoamylene substituent to the internal reorganization energy of MQ〓 and MQ〓 is about 2.0kJ〓.

得电子前后，环A及对位氧的二面角变化对质体醌MQ〓(n=1～7)的内重组能的贡献大于1.60kJ.mol〓，而且得电子前后，异戊烯支链结构参数的变化尤其是二面角的变化对MQ〓／MQ〓及 MQ〓/MQ〓体系的内重组能贡献约为2.0kJ-mol〓。

The selective linear dimerization of isoprene to formate myrcene in a single phase catalyst solution prepared by mixing two metals, amine, solvent and a small content of isoprene was studied.

摘 要：研究了异戊二烯在两种金属催化作用下均相线性二聚生成月桂烯的影响因素，得到优惠工艺条件：反应温度 13℃，催化剂∶异戊二烯=0 。0 5∶1 0 ，胺∶异戊二烯=0 。0 7∶1.0。

The application markets of three kinds of isoolefines(isoprene, cyclopentadiene ,piperylene) from the cracking C5 fractions and their downstream derivatives were reviewed.

着重评述了裂解C5馏分资源中3种异构烯烃(异戊二烯、环戊二烯和间戊二烯)及其下游衍生物的应用市场，并剖析了我国裂解C5资源的利用现状及应用前景。

Comparing with marine oils in the adjacent areas, all crude oils in Hade 4 oil field (except for HD401 well) have following peculiarity: very similar in the composition of light hydrocarbon fraction, and the distribution of of phytane-series isoprenoid alkanes, high concentration in steranes, terpanes and their aromatized compounds, as well as rearranged steranes; low concentration of gammacerane, 24-norcholestanes and 24-rearranged steranes, and low C〓 regular steranes C〓/(C〓+C〓+C〓＜20%; 3-methyl steranes and 27-norcholestane predominated, respectively; very low concentration of dinosterane and 4-methyl steroid.

分析表明，与相邻地区海相原油比较，除最南端的HD401井原油外，其它井区原油均具有下述特点：轻烃馏分组成十分接近、植烷系列类异戊烯烷烃分布较为一致、甾萜类和芳香甾萜类环状化合物浓度较高、重排甾烷丰度较高、伽马蜡烷含量低、规则甾烷组成中C〓丰度低C〓/(C〓+C〓+C〓＜20％、甲基甾烷中以3-甲基甾烷为主、甲藻甾烷和4-甲基甾烷丰度极低、降胆甾烷中以27-降胆甾烷为主、24-降胆甾烷和24-重排降胆甾烷丰度低。

Therefore, the research of synthetic method of flavonoids has the important value of scholarship and application.

因此，研究异戊烯基黄酮类化合物的合成方法具有重要的学术和应用价值。

With structure similar to that of vitamin K, Coenzyme Q10 also known as Ubiquinone 10 is a kind of fatsoluble quinone (C6H4O2), where "10" refers to the number of isoprenyl chemical subunits.

辅酶 Q10又名泛醌10，是一种脂溶性醌，其结构类似于维生素K，因其母核六位上的侧链——聚异戊烯基的聚合度为10而得名，是一种醌环类化合物。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。