一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Phenmedipham
13684-63-4

Phenmedipham synthesis

1synthesis methods
METHYL (3-HYDROXYPHENYL)CARBAMATE

13683-89-1

m-Tolyl isocyanate

621-29-4

1,3-bis(3-methylphenyl)urea

620-50-8

Phenmedipham

13684-63-4

Example 6: Preparation of methyl (3-(3-tolyl-carbamoyloxy)phenyl)carbamate Methyl N-(3-hydroxyphenyl)carbamate (8.35 g, 0.05 mol, prepared according to the method described in Example 1) was placed in a 150 mL beaker fitted with a stirrer, and water (75 mL) was added and stirred to mix. Borax (2.0 g) was added to the reaction system, followed by the slow dropwise addition of 3-tolyl isocyanate (5.3 g, 0.04 mol) through a dispensing funnel over a period of 45 minutes, with no need to adjust the temperature during the reaction. The pH was maintained at 9.2 during the reaction. after the dropwise addition, the reaction mixture was continued to be stirred for 1 hr. Upon completion of the reaction, the resulting finely suspended powdered product was filtered, washed with water and dried to afford the title compound (12.0 g, 100% yield, calculated on the basis of 3-tolyl isocyanate), melting point not determined.HPLC analysis showed the product to be 95.2% pure, with the remaining 4.8% consisting of unreacted N-(3-hydroxyphenyl)carbamic acid methyl ester and the by-products N,N'-di-3-tolylurea. -tolylurea.

-

Yield:13684-63-4 100%

Reaction Conditions:

with borax in water

Steps:

6 Preparation of methyl (3-(3-tolyl-carbamoyloxy)phenyl)carbamate
EXAMPLE 6 Preparation of methyl (3-(3-tolyl-carbamoyloxy)phenyl)carbamate Methyl N-(3-hydroxyphenyl)carbamate (8.35 g, 0.05 mole) (prepared as described in Example 1) in water (75 ml) was placed in a 150 ml beaker equipped with a stirrer, and the mixture was stirred. Borax (2.0 g) was added, and over a period of 3/4 hour 3-tolyl isocyanate (5.3 g, 0.04 mole) was added by means of a separatory funnel without any adjustment of temperature. The pH value was 9.2 during the reaction time. After the addition of the 3-tolyl isocyanate, the stirring was continued for 1 hour. Subsequently the product, which was a very fine, suspended powder, was filtered, washed and dried to yield the title product (12.0 g, 100% calculated on the isocyanate intermediate), m.p. 139.8°-141.8° C. HPLC-Analysis showed a purity of 95.2%, the remaining 4.8% being methyl N-(3-hydroxyphenyl)carbamate and a by-product, N,N'-di-3-tolylurea.

References:

Kemisk Vaerk Koge A/S US4748265, 1988, A

FullText

Phenmedipham Related Search:

桂阳县| 松原市| 溆浦县| 莒南县| 萨迦县| 南丰县| 密山市| 合江县| 保靖县| 固始县| 固镇县| 金寨县| 东明县| 颍上县| 南宁市| 大冶市| 黎平县| 师宗县| 娱乐| 宁波市| 林口县| 咸宁市| 巩留县| 阿拉善右旗| 九寨沟县| 车险| 兴义市| 岑巩县| 武宁县| 南澳县| 永兴县| 兴安县| 黑龙江省| 临猗县| 石台县| 宁海县| 故城县| 新干县| 革吉县| 海盐县| 蓬安县|