Producer of organic intermediates in china . products include derivatives of carboxylic acids , esters , ethers , alcohols , nitriles , and aromatics , including many brominated and chlorinated chemicals -专业生产phba cbz - l - haba甲基巯基四氮唑l - haba等医药中间体，其中还包括公司简介及其联系方法等内容。
The recent progress in the activation and reaction of carboxylic anhydride as well as the catalytic , halide - free processes for the preparation of aldehydes or ketones directly from corresponding carboxylic acids was reviewed 摘要综述了钯催化的酸酐碳一氧键的活化和反应，及由羧酸直接制备相应的醛、酮且不需要卤原子和碱参与的方法。
Two series of intermediates ? - hydroxybiphenyi - 4 ' - carboxylic acid , l ( - ) - 2 - octanol and a kind of chiral additive of liquid crystal were synthesized . to improve the synthesized route and way of the intermediates , i have referred a lot of papers 在查阅大量文献的基础上，对合成上述3个系列化合物的合成路线与方法进行了一系列的改进，改进后的实验达到较理想的结果。
There are also indications that these materials and other similar derivatives of the asphaltenes , especially those containing such functions as carboxylic or hydroxyl , readily exchange cations and could well compete with synthetic zeolites 另有迹象表明，这些物质和沥青质的其它类似衍生物，尤其是具有诸如羧基和羟基功能的物质，能够迅速地交换阳离子，并且同沸石形成有力抗衡。
Experiments with several types of carboxylic acid have been done to inquire into their reactions with potassium permanganate solution so as to find out the changes affected by different density of reactor , temperature of reaction and structure of carboxylic acid 摘要以几种不同类型的羧酸为例进行羧酸与高锰酸钾溶液反应的实验探究，分析了反应物的浓度、反应的温度及羧酸结构对反应的影响。
They were used as efficient lewis acid catalysts for esterification reactions of carboxylic acids with alcohols to afford corresponding saturated esters with 87 % ~ 98 % yields and unsaturated and tertiary ones with 90 % ~ 94 % and 54 % ~ 68 % yields , respectively 结果表明，该有机锡化合物是合成酯的优良催化剂，产品收率高，饱和一元羧酸酯的收率为87 % ~ 98 % ，对不饱和羧酸酯和空间位阻大的叔醇酯也能得到较满意的收率，分别为90 % ~ 94 %和54 % ~ 68 % 。
Degenerate oligonucleotides to highly conserved regions of cucumis melo 1 - aminocyclopropane - 1 - carboxylic acid ( acc ) oxidase gene were used to prime the amplification of fragment of 128bp by ploymerase chain reaction ( pcr ) in samples of genomic dna from fruit of cucumis melo l . cv hetao flesh , which was cloned into plasmid vector pmd - 18 - t . the clon of antisense orientation were selected , and it was inserted downstream of camv35s promoter and enhancer " " of tmv into the plant expression vector pbinyxw , antisence expression vector pbinya was constructed . at the base that pollination and fertilization of cucumis melo l . cv hetao was studied , using pollen tube pathway transformate cucumis melo l . cv hetao , 76 fruit had been obtained , moreover , hardness and content of sugar were analysed 本实验以河套蜜瓜果肉基因组dna为模板，用甜瓜acc氧化酶基因特异寡核苷酸链为引物进行pcr扩增，得到128bp的扩增产物。将得到的扩增产物克隆到质粒载体pmd - 18 - t上，筛选反向克隆，然后将其反向构建到植物表达载体pbinyxw的camv35s启动子和tmv增强子“ ”的下游，构建成反义表达载体pbinya 。并在对河套蜜瓜授粉受精生物学研究的基础上，通过花粉管通道法转化河套蜜瓜，共获76颗瓜，并进行了硬度和含糖量的分析。
( 4 ) the neat cement paste fluidity of copolymer would augment and the cohesiveness of cement would increase along with augmentation of pea dosage , but if the dosage was too big , the dosage of aa would be reduced , so it would reduce the carboxylic content of copolymer , and performance of water reduce would weaken , the dosage of pea23 can not more than 25 % . ( 5 ) the effect of water reduce would increase if the copolymer time increase 而与x40 ;比较，减水率、凝结时间、保坍性、抗压强度比等综合性能还有一定的差距，有待进一步的改进和研究。从合成pc23一6的工业性分析: pea23的酷化和pc23一6的共聚的放大试验看，其混凝土试验结果较为理想，且其合成工艺流程较为简单，具备高分子的合成条件:而从经济性分析， 30 % pc23一6水溶液的原料成本低于fdn ，其性能具有较大的优势，具有广阔的工业化的前景。
