pyran

on the basis of coumarin lasing dyes, a series of pyran type lasing dyes have been synthesized by rigidization and cyclization.

在香豆素激光染料的基础上进行刚化环构，合成了10个吡喃类激光染料。

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syntheses and spectra of pyran lasing dyes photo-dissociation mechanisms in lasing dyes: a laser and flashlamp excitation study

吡喃类激光染料的合成及光谱研究光泵香豆素染料介质光解机理的研究

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uv, ir and 1h-nmr analysis, the three fractions of polysaccharide are β-glycosidic linkage of the pyran ring polysaccharide.

经UV、IR和1H-NMR分析可知，三种多糖为β-糖苷键连接的吡喃环多糖。

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ir and raman spectroscopic studies on the complexes of ytterbium with pyran derivatives

吡喃酮类化合物与镱配合物的红外和拉曼光谱研究

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Pyran is not aromatic, but the phrylium ion is.

吡喃不是芳香的, 但眬英嗡离子是.

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Two new derivatives of 4-dicyanomethylene-2 , 6-dimethyl-4 H-pyran and the corresponding poly ( amic acid ) were synthesized and characterized.

两种新的 4- 二氰亚甲基 -2, 6- 二甲基 -4H- 吡喃衍生物及对应的聚酰胺酸被合成和表征.

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one pot synthesis of pyrazolo [ 5,4-b]-γ-pyran derivatives in ionic liquid

在离子液体中一步法合成吡唑[5,4-b]-γ-吡喃衍生物

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uv-vis spectrum and ftir analysis showed that clps-a2 was β-heterosaccharides with pyran and acetyl amino group.

紫外可见吸收光谱和红外光谱的分析结果表明CLPS-A2为具有乙酰氨基结构的β型吡喃多糖。

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under the acid free condition, 3 acetyl 2 hydroxy 6 methyl pyran 4 one ( 8) was obtained and its structure was confirmed by x ray diffraction analysis.

在没有酸催化的条件下，反应生成3乙酰基2羟基6甲基-吡喃4酮（8），并通过单晶X射线衍射分析确定了产物的结构；

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The active ingredient of α-pyrone 0.2 % wettable powder is 5,6-dihydro-6-pentyl-2 H-pyran-2-one.

0.2%α - 吡喃酮WP的 有效成分为5, 6- 二氢-6-戊基-2H-吡喃 -2- 酮(5, 6-dihydro-6-pentyl-2H-pyran-2-one ).

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