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硼烷

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Si-B-N ceramic fibers with composition Si1.13BN2.47 were prepared by melt-spinning, curing and pyrolysis of a preceramic polyborosilazane.

以聚硼硅氮烷为先驱体,经熔融纺丝、不熔化处理以及在氨气气氛中高温裂解制备了Si-B-N陶瓷纤维。

The crosslinked PEG-20M glass capillary column was prepared by dynamic coating method with boron trifluoride as catalyst,3-glvcidyl-oxypropyl-trimethoxysilane as crosslinking agent.

以PEG-20M为固定相,三氟化硼为催化剂,3-缩甘油氧丙基三甲氧基硅烷(简称KH-560)为交联剂,二氯甲烷为溶剂,对预先用氯化钠沉积法粗糙化的玻璃毛细管柱进行动态涂渍。

In route 1, geranylamine was synthesized from geraniol via Mitsunobu reaction and aminolysis. Adamantan-2-amjne was synthesized from adamantan-2-one via reductive imination and catalytic hydrogenation.

第一条路线香叶醇经Mitsunobu反应、胺解反应得到香叶胺;2-金刚烷酮经亚胺化、硼氢化钠还原、催化氢化脱节基得2-金刚烷胺。

Dihydrojasmone was synthesized from2-hexyl-5-methyl-1,2-oxaborolane,prepared frommethyl vinyl ketone and hexene,via the homologationwith 〓 followed by PCC oxidation and intra-molecular condensation.In stead of the oxidation ofthe C-B bond of 1,2-oxaborolane,fluoride inducedhalogenation of 2-alkoxy-1,2-oxaborolane was found togive 3-halopropanol.

硼氢化甲基乙烯基酮和已烯得到的2-已基-5-甲基-1,2-氧硼杂环戊烷与〓反应,再经PCC氧化,分子内缩合得到二氢茉莉酮。1,2-氧硼杂环戊烷的C-B键除氧化断裂之外,也能够在〓或KF作用下卤化断裂成碳卤键。

Based on B-trichloroborazine with boron-nitrogen ring structure, the monomer was synthesized by substitution reaction with different molar ratio of propylamine/isopropylamine, then the corresponding polyborazine was obtained through thermal polymerization.

以三氯环硼氮烷为原料,将其与正丙胺/异丙胺进行共取代反应,制得了不同结构的取代单体,再经热聚合反应获得了相应的聚硼氮烷先驱体。

Based on B-trichloroborazine with boron-nitrogen ring structure, the monomer was synthesized by substitution reaction with different molar ratio of propylamine/isopropylamine, then the corresponding polylyborazine was obtained through thermal polymerization.

以三氯环硼氮烷为原料,将其与正丙胺/异丙胺进行共取代反应,制得了不同结构的取代单体,再经热聚合反应获得了相应的聚硼氮烷先驱体。

However, silanes do not interact to any significant degree with the ubiquitous calcium carbonate, or with barium sulphate, carbon black or boron compounds, and cannot be used as coupling agents with these fillers.

但是,硅烷不与使用普遍的碳酸钙有任何作用,与硫酸钡、碳黑或者硼化合物也是这样,因此硅烷不能用作这些填料的偶联剂。

Studies on the nature of chemical bonds in boranes I.

硼烷分子中化学键性质的研究I。

The new system has been applied to the asymmetric catalytic reduction of pro ketones .

第一次成功设计、合成了新型的双手性口恶唑硼烷还原体系,并将其应用于前手性酮的不对称还原。

Polyborosilazane, a precursor to SiBNC ceramic, was synthesized via cocondensation approach using methyldichlorosilane (MeHSiCl2), boron trichloride (BCl3) and hexamethydisilazane as starting materials. SiBNC ceramics were obtained by pyrolysing the as-synthesized PBSZ in N2 or NH3/N2 atmospheres.

以甲基氢二氯硅烷、三氯化硼、六甲基二硅氮烷为起始原料,采用共缩合原理合成了聚硼硅氮烷先驱体,将PBSZ分别在N2和NH3/N2气氛中高温热解得到SiBNC陶瓷。

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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面,更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。

You rap, you know we are not so good at rapping, huh?

你唱吧,你也知道我们并不那么擅长说唱,对吧?