查询词典 base 2

Flowers subsessile; pedicel absent to 1(--2) mm, pubescent; bract and bracteole borne on distal part of pedicel, linear-lanceolate, proximally pubescent; bract 4--8(--11) mm, shorter than or equaling flower (sometimes a few bracts at base of raceme to 2 × flower length), apex acute.

花近无柄；花梗无到1(-2)毫米，密被短短柔毛；苞片和小苞片生于花梗上部，线状披针形，下部的短柔毛；苞片4-8(-11)毫米，短于或等长花（有时苞片在基部的总状花序达2倍花长度，先端锐尖。

Firstly, 24 chiral Schiff base ligands were prepared and evaluated for theasymmetric HDA reaction between Brassard diene with benzaldehyde. Theresults revealed that the ligand derived from 3,5-di-tert-butylsalicylaldehydewith (1R,2S)-2-amino-1,2-diphenyl-1-ethanol shows an excellent chiralinduction in the reaction.

首先合成了 24 个手性三齿席夫碱配体，并应用于 Brassard 二烯与苯甲醛的不对称 Hetero-Diels-Alder 反应，结果表明，3，5-二叔丁基水杨醛与(1R，2S)-1，2-二苯基-2-氨基-乙醇生成的单席夫碱显示出优秀的手性诱导能力。

Stamens 5, usually inserted at base of corolla tube and adhering to stigma head to form gynostegium; filaments usually connate to form a tube enclosing ovaries; anthers 4-celled (Periplocoideae and Secamonoideae) or 2-celled, often with a membranous apical appendage; pollen tetrads contained loosely on a spatulate translator with a basal corpusculum, or pollen united into waxy pollinia, each attached through a caudicle to the retinaculum between adjacent anthers to form a pollinarium, pollinia 2 or 4 per pollinarium.

雄蕊5，着生于花冠筒的基部，与柱头贴生，和柱头粘生，形成合蕊柱；花丝通常合生成管包围子房；花药4室(Periplocoideae和Secamonoideae)或者2室的，通常有一膜质的顶端附属物；四合花粉松散地着生于匙形的载粉器上，具有着粉腺体，或者花粉合生成腊质的花粉块，通过花粉块柄与系接于着粉腺上，每个花药有花粉块2个或4个。

Leaves spirally arranged, radially spreading, or pectinately arranged in lateral sets, linear, straight or curved, flattened, grooved adaxially, stomatal bands 2, abaxial, vascular bundle 1, resin canals 2(-10 outside China), marginal or median, rarely submedian, base twisted. Pollen cones borne in leaf axils of previous year's branchlets, pendulous, narrowly ellipsoid or oblong when young, finally cylindric; pollen 2-saccate.

叶螺旋状排列，光线传播，或pectinately排列在方面侧确定，线形，直或弯曲，扁平，正面具槽，气孔带2，背面，维管束1，雄球花生于第二年小枝的叶腋，下垂，或长圆形的狭椭圆形幼时，最后圆筒状；花粉2囊。

Subshrubs; leaf blade 1-2.7 × 1-2.5 cm, base cuneate, margin entire; petiole 0.5-1.3 cm; flowers purple-red; fruit clavate, with wartlike glands.

亚灌木；叶片 1-2.7 * 1-2.5 厘米，基部楔形，边缘全缘；叶柄0.5-1.3厘米；花紫色红；果棍棒状，具腺体。 2 C 。 lantsangensis 澜沧粘腺果

Bromo-5-formyl -3-methylpyrrole is an important intermediate of tolyporohin. On the base of introducing the present research and development of tolypo- rohin and pyrroles ramification at home and abroad, an emphasis was made on synthesis of 2-Bromo-5-formyl -3-methylpyrrole and the technical conditions of all steps, which was described as follows. Diethyl 3,5-dimethylpyrrole-2,4-dicarboxylate was made by nitrification, reduction and cycle of ethyl acetoacetate.

由于2-溴-5-甲酰基-3-甲基吡咯是合成托尼卟吩的重要中间体，本文在阐述了当前托尼卟吩及吡咯衍生物的国内外研究和开发的基础上，重点研究了2-溴-5-甲酰基-3-甲基吡咯的合成，并对各步反应进行了工艺研究，具体合成步骤如下：本文通过对乙酰乙酸乙酯的亚硝化、还原、成环，反应生成吡咯单环衍生物2，4-二乙氧羰基-3，5-二甲基吡咯。

The coupling reaction of aryl iodides, bromides and chlorides with differentolefins catalyzed by catalyst 2 and 4 was studied. It was found that compounds 2 and 4 anchored on active carbon are efficient catalyst for the Heck reaction in the case of aryl bromides and aryl chlorides as substrates (Scheme 3). It is notable that catalyst 4 has higher efficiency for aryl chlorides.___^H Cat.2 or 4, Base HXSolution, 100C or 140

以化合物2和4为代表，重点研究了活性炭负载的二茂铁亚胺环钯化合物催化碘代苯、溴代苯和氯代苯与活泼烯烃之间的偶联反应(Scheme 3)，发现活性炭负载的二茂铁亚胺环钯化合物2和4均可用于催化多种溴代和氯

Culm sheaths tardily deciduous, straw-colored, white powdery and stiffly white hairy abaxially, distal margins with cilia 1–2 cm, base without a projection, apex truncate; auricles inconspicuous; oral setae many, 1–1.8 cm; ligule truncate, short, 1–1.5 mm, margin ciliate; blade reflexed, linear-lanceolate, more than 1/2 or 2/3 length of sheath, abaxially glabrous, apex acuminate.

分枝50(-100)缓慢落叶，稻草色，白色粉状和硬白色有毛的厘米竿箨，叶耳不明显；口头的刚毛很多，1-1.8厘米；叶舌削去，短，1-1.5毫米，边缘具缘毛；叶片反折，线状披针形，超过1/2的或2/3段鞘，背面无毛，先端渐尖。

Corolla blue to wine-red, rarely pink, white, or yellow, zygomorphic, inside glabrous, rarely sparsely puberulent; tube cylindric to funnelform-tubular, not swollen, rarely saccate at base, longer than limb, 2-13 mm in diam.; limb 2-lipped; adaxial lip 2-lobed, 1.5-3 X shorter than abaxial lip; abaxial lip 3-lobed, lobes equal or central lobe longer, apex rounded, rarely obtuse to acute.

对红色，很少粉红色，白色酒蓝色的花冠，或黄色，左右对称，里面无毛，很少疏生微柔毛；管状的筒部圆筒状到漏斗状，不膨胀，囊状在基部，长于瓣片，2-13毫米直径的很少；瓣片二唇形； 2裂的正面唇，1.5-3 X短于背轴唇； 3浅裂的背面唇，裂片等长或中央裂片长，先端圆形，很少钝到锐尖。

The altostratus base is 2 km high, and cloud top is higher than 5 km. The supercooled water exists abundantly in the cloud, the maximum is up to 0.21 g.m-3 at -11.20℃, but its distribution is not homogeneous, 87%of continuous distribution width are less than 2.4 km, which is disadvantage to the rime increasing of ice crystal in the cloud. Meanwhile, the evaporation effect of subcloud raindrop is very big, the diameter of raindrops which could not arrive the ground is less than 1 mm. Therefore, The cold vortex process produces the weak precipitation.

As云底高2 km，云顶高大于5 km，云中存在比较大的过冷水区，-11.2℃时的过冷水含量0.21 g.m-3，但过冷水的含量分布极不均匀，大于0.05 g.m-3的过冷水区连续分布的宽度87%小于2.4 km，不利于云中冰晶的连续凇附增长；同时云下雨滴的蒸发效应大，直径小于1.0 mm的雨滴难以落到地面，因此本次过程只产生弱的降水。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。