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- The total synthesis of 3,7 dimethyl 2 tridecanyl acetate,the active component of the sex pheromone of diprion pini,was investigated in this paper. 对松叶蜂 diprion pini性信息素活性组分 3;7-二甲基 -2 -十三碳醇乙酸酯的全合成进行了研究 .
- Keywords pine sawfly;sex pheromone;3;7 dimethyl 2 tridecanol;7 dimethyl 2 tridecanyl acetate; 松叶蜂;性信息素;3;7-二甲基-2-十三碳醇;7-二甲基-2-十三碳醇乙酸酯;
- Fluorobenzonitrile(4 FBN) was prepared by fluorination of 4 chlorobenzonitrile(4 CBN) with potassium fluoride using 1,3 dimethyl 2 imidazolidone (DMI) as a non polar solvent. 以4氯苯甲腈(4CBN)和无水氟化钾为原料,1,3二甲基2咪唑啉酮(DMI)为反应介质,经氟化反应合成了4氟苯甲腈(4FBN)。
- Polyquin(2,3-b) acridine-12,14(5,7) dione(polyquinacridinedione,PQA) was synthesized via condensation,cyclization and oxidation from m-phenylenediamine and dimethyl 2,5-dioxocyclohexane-1,4-dicarboxylate etc. 以间苯二胺,2,5-二氧环己二甲酸二甲酯为原料,经缩合、闭环、氧化等反应,制得了聚喹吖(2,3b)啶-12,14(5,7)二酮(PQA)并进行了表征;
- In a 200 mL stainless steel autoclave, dimethyl 2,6 naphthalene dicarboxylate (DM 2,6 NDC) was prepared by reacting 2,6 naphthalenedicarboxylic acid (2,6 NDA) with methyl alcohol in the presence of phosphotungstic acid as catalyst. 在 0 .;2 L不锈钢高压釜中;用磷钨酸作催化剂;以 2;6萘二甲酸和甲醇为原料制备了 2;6萘二甲酸二甲酯。
- This article reported a new synthetic method of 2,5 dimethyl 2,5 di( t butylperoxy)hexane, one of the peroxy organic compounds. 报道一种有机过氧化物 2 ,5 -二甲基 -2 ,5 -双 (叔丁过氧基 )己烷 (简称双 2 5 )的合成新方法。
- D;2,BD;3,A;4,AD;5,A;6,CD(只有C正确);7,AC;8,C;9,A;10,D. 二;答案及评分标准:全题21分;答案正确的;按下列答案后面括号内的分数给分;答错的;不答的;都给0分.
- Keywords homogenous catalyst;dimerization of propylene;2;3 dimethyl 2 bueune; 丙烯二聚;四甲基乙烯;均相催化剂;
- Renumber Figure 2 and Figure 3 to Figure 7 and Figure 6 respectively. 把图2和图3依序重新编号为图7和图6。
- Subtract 3 from 7 and you have 4. 七减三得四。
- Thesynthesisof (4S ,6S ,7S) 7 Hydroxy 4,6 dimethyl 3 nonanone ,thesex pheromoneofLasiodermaserricorneFabricius,wasachievedbystartingfrom propargylalcohol and (S) proline . 以丙炔醇及(S)脯氨酸为原料;合成了烟草甲性信息素(4S;6S;7S)7羟基4;6二甲基3壬酮.
- Divide 2 into 7, and the answer is 3, remainder 1. 7 除以 2,商3余 1。
- Size 5 5 1 6 0 2 sq km. 3 0 0 0 km long coastline. 面积551602平方千米。
- Divide 2 into 7,and the answer is 3. 除7,商3余2
- There are four primes less than 10: 2, 3, 5, and 7. 有四个小于10的素数:2、3、5和7。
- Is the match on at 2 pm or 3 pm? 比赛是下午2时还是3时开始?
- THE SYNTHESIS OF ENDO 2 (3,3 DIMETHYL 2 NORBONYL) BUTANAL AND ITS DERIVANTS 肖转泉,李萍,张雪红, 内型2-(3,3-二甲基-2-降冰片基)丁醛及其衍生物的合成
- The effect of the solvent on bromination of 6 methoxy 2 acyl naphthalene and 2 methoxyl naphthalene with 1,3 dibromo 5,5 dimethyl hydantoin was studied. 考察了在不同极性溶剂中以 1 ,3 二溴 5,5 二甲基海因作溴化剂对溴化 6 甲氧基 2 酰基萘反应的影响。
- The farmer paid 3 laborers to gather the crop. 农场主雇佣3名工人收割庄稼。
- We are used to writing numbers in base ten, using 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. 我们习惯使用0,1,2,3,4,5,6,7,8,9的十进制计数方法。