Various alkyl or haloalkyl substitutions are incorporated at carbon-25.
各种烷基或卤代烷基取代基结合在碳-25上。
The super-branched polyester of the invention has the following structural formula, wherein R is alkyl or fluorine-containing alkyl of different types.
本发明的超支化聚酯，具有如下结构式：式中R为不同种类的烷基或者含氟烷基。
The present invention relates to compounds of formula (I) wherein R1 is hydrogen, lower alkyl or benzyl which may be optionally substituted by halogen or lower alkoxy;
本发明涉及式（I）化合物及其药用活性盐，其中R1是氢、低级烷基或苄基，其可任选地被卤素或低级烷氧基取代；
High levels of chemicals called alkyl-methoxypyrazines can make wines taste as though the fruit from which they were made was under-ripe or low-quality.
如果酒中有高含量的甲氧基有机化合物，我们尝起来觉得是酿制酒的水果没有成熟或是质量低劣的。
The side chain of EVA is mainly butyl, amyl, or longer alkyl.
EVA分子结构中的侧链主要是丁基、戊基或更长的烷基。
A term used in petroleum technology to describe a method of removing methyl groups (or other alkyl groups) from a hydrocarbon compound and replacing them with hydrogen.
石油技术所用的一个术语，叙述将烃类化合物的甲基(或其他烷基)脱除下来并代之以氢的方法。
This article shows particular description of Fabricating Soluble Carbon Nanotubes with Ferrocene or Pyrene Containing Poly (1-alkyl) alkynes.
本论文详尽描述了利用含二茂铁或芘的聚(1 -烷基)炔合成可溶性碳纳米管。
The invention relates to a compost accelerant, in particular to a compost accelerant prepared from alkyl polyuronide, humic acid or humate and sugar waste.
本发明涉及一种堆肥促进剂，具体是涉及一种由烷基多糖苷、腐植酸或腐 植酸盐和制糖废液制备而成的催肥促进剂。
The result shows excellent selectivity of to the 1, 3 - substitution positions, and the alkyl chain may be saturated or unsaturated and may contain one or more heteroatoms.
结果显示对1,3-取代位置的优异选择性，并且烷基链可以是饱和的或不饱和的，并且可以含有一种或多种杂原子。
Conclusion Introducing the methyl group or a low alkyl group resulting in the high selectivity and increase of its activity.
结论甲基或低级烷基的引入导致了高选择性，使其活性增大。
By two alkyl halide with alkali metal or alkaline earth metal polysulfides from condensation.
由二卤代烷与碱金属或碱土金属的多硫化物缩聚而成。
Preferred cationic sequestrants are quaternary nitrogen compounds including medium or long chain alkyl groups.
首选季铵盐阳离子螯合剂的氮化合物，包括中型或长链烷基。
Biodiesel, also known as fatty acid alkyl esters which are made from renewable biological sources such as vegetable oils or animal fats, is a sort of renewable energy of friendly environment.
生物柴油是由动植物油脂或长链脂肪酸与甲醇等低碳醇合成脂肪酸甲酯，是一种环境友好型可再生能源。
This article mainly focuses on the shape and size control of nanoparticles with organic stabilizers, which have one (or more) coordination group and long alkyl chain.
本文介绍了近年来纳米粒子的控制生长和组装研究的现状。
Preferred non-aqueous solvents include alkyl alcohols or ketones having less than about six carbon atoms.
首选非水溶剂包括烷基醇，酮则少于六个碳原子。
Ginsenoside, the main components of ginseng, is dammarane tetracyclic triterpenoids or hong resin alkyl type pentacyclic triterpene, which has not yet been synthesized artificially.
其主要功能成分是人参皂苷，即达玛烷型四环三萜类或香树脂烷型五环三萜类化合物，至今人参皂苷尚未能人工合成。
R2 represents a branched or unbranched alkyl group with 5 to 17 carbon atoms;
R2表示支化或未支化的具有5-17个碳原子的烷基；
R2 represents a branched or unbranched alkyl group with 5 to 17 carbon atoms;
R2表示支化或未支化的具有5-17个碳原子的烷基；
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