cas 2188-09-2, 1,1 (hexamethylene)diurea | Articles data

Articles about 2188-09-2Total 8 be found

TWO-STEP AND ONE-POT PROCESSES FOR PREPARATION OF ALIPHATIC DIISOCYANATES
The present invention relates to using a two-step (thermolysis) or one-pot process to prepare aliphatic diisocyanates from aliphatic diamines and diaryl carbonates. Polyisocyanates can also be prepared from polyamines and diaryl carbonates. The present synthetic processes do not apply phosgene or highly toxic reagents and chloro-solvents during the entire procedure.
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Paragraph 0117

(2017/02/02)

A manufacturing method of a compound having a ureidopirimidine
PROBLEM TO BE SOLVED: To obtain a compound having a ureido group useful as an intermediate for producing an isocyanate, without producing by-products, which are produced in conventional production processes, and in a high yield and high purity. SOLUTION: An organic primary amine of formula (1) and urea are subjected to ureidization reaction in the presence of an aromatic hydroxylcompound of formula (2). In the formula (1), R1is a 1-35C organic group, and a is 1 to 10. In the formula (2), A is a 6-50C organic group having an aromatic ring, and the organic group is replaced with b aromatic hydroxyl groups, and b is 1 to 3. COPYRIGHT: (C)2012,JPOandINPIT
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Paragraph 0063

(2016/12/22)

Method for Preparing Diureido Compounds
The present invention relates to a method for producing diureido by making diamine having 2 to 13 carbon atoms react with urea. The producing method uses alcohol having 3 to 12 carbon atoms as a reaction solvent and uses tetraalkylammonium hydroxide as a catalyst. According to the producing method of the present invention, the diureido can be produced in a high yield and in a short time.COPYRIGHT KIPO 2016
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Paragraph 0036; 0037

(2016/12/22)

METHOD FOR PRODUCING COMPOUND HAVING UREIDO GROUP
PROBLEM TO BE SOLVED: To provide a method for producing a compound having a ureido group capable of obtaining a compound having a ureido group useful as an intermediate in producing an isocyanate in a short time with a high yield and high purity while sup
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Paragraph 0088

(2017/08/24)

Method for Producing Carbonyl Compund
A method for producing a carbonyl compound of the present invention comprises a step (X) of reacting a specific compound having a urea bond with a carbonic acid derivative having a carbonyl group (—C(═O)—) under heating at a temperature equal to or higher
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Paragraph 0719; 0720; 0721

(2013/07/19)

PROCESS FOR THE PREPARATION OF N-SUBSTITUTED CARBAMIC ACID ESTER AND PROCESS FOR THE PREPARATION OF ISOCYANATE USING THE N-SUBSTITUTED CARBAMIC ACID ESTER
The present invention provides a method for producing N-substituted carbamic acid-O-aryl ester derived from a compound having an ureido group, the method comprising the step of carrying out esterification or esterification and transesterification from the compound having the ureido group and a hydroxy composition containing one type or a plurality of types of hydroxy compounds.
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Page/Page column 123

(2011/06/10)

METHOD FOR PRODUCING ISOCYANATES
The present invention relates to a multiple-stage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic poly-amines with ureas to form low-molecular monomeric polyureas, and the thermal decomposition thereof.
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Page/Page column 7

(2010/12/26)

Synthesis of Bis(pyridodipyrimidines) as Autorecycling Redox Catalysts and Their Remarkable Turnover in the Oxidation of Alcohols
Bis(pyridodipyrimidines) (bis-PP's) as redox catalysts, in which two pyridodipyrimidine moieties are linked with polymethylene chains, have been synthesised by the condensation of bis(6-chloro-5-formyluracil-3-yl)alkanes with 6-alkylaminouracils.These bis-PP's oxidized alcohols more efficiently than monomeric pyridodipyrimidines to give the corresponding carbonyl compounds.Particularly, bis(7-methyl-10-(n-octyl)pyridodipyrimidin-3-yl)decane (5j) exhibitet remarkable oxidizing ability toward cyclopentanol as a turnover catalyst, and its maximum effective concentration(MEC) was determined.The MEC of 5j was 6.7E-5 mmol (59 μg)/3 ml of cyclopentanol at 115 deg C, and the MEC under introduction of oxygen (5 ml of oxygen/min) was 2E-4 mmol (177 μg)/3 ml of cyclopentanol at 100 deg C.Apart from the chemical yield of cyclopentanone, even an amount of only 2E-11 mmol (17.7 pg) of catalyst 5j oxidized cyclopentanol to give cyclopentanone in 13300000000000 percent yield based on the catalyst.This implies that the turnover number of catalyst 5j is 8.9E7 mol min-1 (mol of catalyst)-1, which would surpass that of bovine liver catalase, although the condition is quite different.
Yoneda, Fumio,Tanaka, Kiyoshi,Yamato, Hirotake,Moriyama, Kenji,Nagamatsu, Tomohisa
p. 9199 - 9202
(2007/10/02)