烯酮，特别是二甲基烯酮，很容易齐聚和聚合。
Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization.
烯酮，特别是二甲基烯酮，很容易齐聚和聚合。
Ketenes notably dimethyl ketene readily undergo oligomerization and polymerization.
以2，3- 丁二酮和乙二胺为原料，采用二步法合成了2，3-二甲基吡嗪．研究了催化剂体系对脱氢反应的影响，得到了较好的结果．。
Dimethylpyrazine was synthesized by the two_steps method of 2,3-butylanedione and ethylenediamine, the dehydrogen catalytic system was studied and better results were obtained.
烯酮，特别是二甲基烯酮，很容易齐聚和。
Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization.
本文以聚矾和磺化聚砜共混物为膜材料，二甲基乙酰胺为溶剂，聚乙烯吡咯啉酮和邻苯二甲酸二甲酯为添加剂配制纺丝液，纺制外压中空纤维超滤膜。
This paper reported the preparation of hollow fiber UF membrane, using PS and SPS as membrane spinning materials, DMA as solvent, PVPand dimethyl phthalate as additives.
共聚物在N，N-二甲基酰胺（DMF）、二甲基亚砜（DMSO）、N-甲基-2-吡咯烷酮（NMP）等极性溶剂和浓H2SO4中有良好的溶解性。
The copolymers show good solubility in N, N-dimethylformamide (DMF), dimethyl sulphoxide (DMSO), N-methyl-2-pyrrolidone (NMP) and some inorganic acids like H2SO4.
综述了新溶剂1 ，3-二甲基- 2 -咪唑啉酮在有机合成中的应用，如高分子聚合物、杂环化合物和有机金属化合物等的合成。
The applications of a new solvent 1,3-dimethyl-2-imidazolidinone in organic synthesis, such as in synthesis of high polymers, heterocyclic compounds, organometalloidal compounds etc.
标题化合物C24H22N2O2是由N-（4-羟基苯亚甲基）喹啉-5-胺和5，5-二甲基-1，3-环己二酮在氯化三乙基苄基铵（TEBAC）催化下以水作溶剂反应而得。
The title compound C24H22N2O2 has been synthesized by the reaction of N-arylidenenaphthalen-2-amine with 5,5-dimethyl-1,3-cyclohexadione water catalyzed by triethylbenzylammonium chlorideTEBAC.
标题化合物C24H22N2O2是由N-（4-羟基苯亚甲基）喹啉-5-胺和5，5-二甲基-1，3-环己二酮在氯化三乙基苄基铵（TEBAC）催化下以水作溶剂反应而得。
The title compound C24H22N2O2 has been synthesized by the reaction of N-arylidenenaphthalen-2-amine with 5,5-dimethyl-1,3-cyclohexadione water catalyzed by triethylbenzylammonium chlorideTEBAC.
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