high-yield

This method of cultivation produces higher yield.

这种耕作方法可提高。

The fields give high and stable yields regardless of climatic circumstances.

气候条件如何, 这块地总保持高稳。

The synthesis of ethyl vanillin from urotropin is a major method with high yields,simple process, and available raw materials.

乌洛托品法合成已基香兰素的一种重要方法，它操作简单，原料易，较高。

Phenoxyacetophenone could be prepared from potassium phenolate and m bromoacetophenone via Ullmann reaction catalyzed by copper acetate in high yields.

间苯氧基苯乙酮可由酚钾与间溴苯乙酮在醋酸铜催化下以高合成。

The stable organic solution of dichloroglyoxime was prepared in high yield by chlorine aerated into the ethylene glycol solution of glyoxime.

将乙二肟溶于乙二醇,通入氯气,生成稳定的二氯乙二肟溶液,这种方法制备的二氯乙二肟贮存稳定,高。

The invention is applied to the catalytic reactions such as aromatic ketone unsymmetrical hydrogen transfer reaction and can achieve very high yield and enantiotropic selectivity.

此发明应用于芳香酮的对称氢转移反应等的催化反应中，可以到很高的和对映选择性。

P-Brom-ethylphene was prepared by brom-phene by means of Friedel-Crafts and Huang Ming-long reactions. The synthesis can be industrialized because of good quality, high yield and low cost.

对溴乙苯以溴苯为原料,经付克乙酰化,黄鸣龙还原等反应合成,其质和收较高,成本较低,具有工业化意义。

This method not only lowcrs the temperature of labelling ortho-iodo-hippuric acid, speeds up the reaction and gives high yield, but aslo suits the requirement of large scale production.

早期,邻-碘马尿酸的标记大多采用水溶液体系,热熔融体系,热液熔融体系的交换法来制备。