邻苯二酚

THE FIRST TOTAL SYNTHESIS OF TAXAMAIRIN B Taxamairin B, representive of rare naturally-occuring rearrang-ed 9(10→20)-abeo-8, 11, 13-triene diterpenoids, has been firstsynthesized by a eleven-step route in an overall yield of 8.19%,starting from commercially available catechol and 1,3-cyclohexan-dione. The improved Friedel-Crafts annulation, thermodynamicallycontrolled-geminal pairing methylation, the selective oxidation ofallyl group and the selective reduction of the less-hindrancecarbon-carbon double bond are the key steps.

二。美丽红豆杉素B的全合成研究 1，美丽红豆杉素B的首次全合成以价廉，易得的邻苯二酚和1，3-环己二酮为原料，经过改良的Friedel-Crafts烷基化反应，热力学控制的α，β-不饱和酮结构的α一位双烷基化，烯丙位的选择性氧化，以及选择性还原位阻较小的碳碳双键等十一步反应，以8.19％的总收率首次完成了美丽红豆杉素B的全合成。

Catechol is one of the substrate of plant material browning.

邻苯二酚类的酚类化合物是植物材料发生褐变的主要底物。

The largest absorbion of the product of the reaction between PPO and catechol was at λ=410nm.

通过对澳洲青苹多酚氧化酶与邻苯二酚反应产物的重复波谱扫描，方便快速的确定了量化反应产物含量的特定吸收波长λ＝410nm。

The apparent Km values with guaiacol, catechol and pyrogallol as substrates were 2.75, 12.4 and 12.8mmol/L at 25℃ and pH 7.0, respectively.

该酶在25℃和0.05mol/L磷酸缓衝液(pH7.0)条件下对愈创木酚、邻苯二酚和没食子酸的Km分别是2.75、12.4和12.8mmol/L。

The effect of physicochemical factors on phenoloxidase activity of hemocyanin from Haliotis diversicolor was studied with catechol as substrate.

以邻苯二酚为底物研究部分理化因子对杂色鲍血蓝蛋白酚氧化酶活性的影响。

Amounts of 2 furaldehyde and 5 hydroxymethyl 2 furaldehyde in wood vinegar from the treated wood were increased,but amounts of carboxylic acids,phenols,pyrocatechol,guaiacols,and maltol were almost constant.

与未处理材相比，处理材木醋液中糠醛及5 羟甲基糠醛的收量增加，而羧酸类、苯酚类、邻苯二酚、愈创木酚类及麦芽酚的收量几乎不变。

Dioxymethylene Mandelic Acid was synthesized by Benzo[1,3]- dioxole which was prepared from catechol .

以邻苯二酚为原料制备胡椒环，然后再从胡椒环合成3，4—亚甲二氧基苯乙醇酸，研究了第二步的反应温度、反应时间以及物料摩尔比对收率的影响，该步反应收率为88%。

Specificity studies on the substrate revealed that the HdPO was capable of oxidizing not only the o-diphenol, but also tyrosine. The apparent Km value on tyrosine was about 9.52 mmol/L. As shown in the experiments, HdPO behaved oxidizing activities both on diphenol and monophenol, which implies that the HdPO was probably not only a type of tyrosinase-type PO but also a catechol-type.

底物特异性研究还发现此HdPO不仅对邻苯二酚具有氧化活性，对酪氨酸底物也具有氧化活性，且对酪氨酸的Km值约为9.52mmol/L，说明该酶既具有酪氨酸酶活性，又具有儿茶酚酶活性。

Isopropyl 1,3 benzodioxolane was synthesized from catechol and isobutyric aldehyde using the phosphotungstic acid supported on activated carbon as catalyst.

以邻苯二酚和异丁醛为原料，活性炭固载磷钨酸为催化剂合成了杀虫剂呋喃丹的中间体2 -异丙基- 1，3-苯并二氧五环。

The interactions between phenol,m-cresol or catechol with DNA sensor were analyzed, results indicated that the threephenols damaged DNA.The direct oxidation peaks of DNA were decreased linearly withthe phenols concemtrations.R%D_(50) values showed that the m-cresol damnified DNA mosteasily.

研究了苯酚、间甲酚和邻苯二酚与DNA的作用，结果表明其对DNA有损伤作用，且存在剂量效应关系，一定浓度范围内，DNA的峰电流与酚的浓度呈线性下降关系。R％D_(50)值分析结果表明这三种酚污染物中间甲酚最容易损伤DNA。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。