METHOD FOR PRODUCING POLYALKYLENE GLYCOL DERIVATIVE HAVING AMINO GROUP AT END
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20160159831A1
公开(公告)日:2016-06-09
A method simply produces a narrowly distributed and high-purity polyalkylene glycol derivative having an amino group at an end without using a heavy metal catalyst. A method for producing a polyalkylene glycol derivative having an amino group at the end by reacting a compound represented by the general formula (V) with an alkylene oxide, then reacting a reaction product with an electrophile represented by the general formula (I), and deprotecting the obtained product without using a heavy metal:
R
A
3
O(R
A
4
O)
k-1
R
A
4
O
−
M
+
(V)
wherein R
A
3
represents a linear; branched, or cyclic hydrocarbon group having 1 to 20 carbon atoms; R
A
4
represents an alkylene group having 2 to 8 carbon atoms; k represents an integer of 2 to 5; and M represents an alkali metal;
wherein R
A
1a
and R
A
1b
each independently represent a protective group of the amino group, or one of R
A
1a
and R
A
1b
represents H and the other represents a protective group of the amino group, or R
A
1a
and R
A
1b
bind to each other to form a cyclic protective group, and the protective group is deprotectable without using a heavy metal; R
A
2
represents a linear, branched, or cyclic hydrocarbon group having 1 to 6 carbon atoms; and X represents a leaving group.
Competitive Intramolecular Hydrogen Bonding in Oligo(ethylene oxide) Substituted Quadruple Hydrogen Bonded Systems
作者:Tom F. A. de Greef、Marko M. L. Nieuwenhuizen、Rint P. Sijbesma、E. W. Meijer
DOI:10.1021/jo902053t
日期:2010.2.5
A series of oligo(ethyleneoxide) (oligoEO) substituted 2-ureido-pyrimidinones (UPy), differing in the number of ethyleneoxide units and the length of the aliphatic spacer connecting the oligoEO side chain with the UPy group, have been prepared. It was found that variation in these structural parameters strongly influences the dimerization constant (Kdim) of the UPy dimer and the association constant
METHOD FOR PRODUCING POLYALKYLENE GLYCOL DERIVATIVE HAVING AMINO GROUP AT END, WITH NARROW MOLECULAR WEIGHT DISTRIBUTION
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20150197482A1
公开(公告)日:2015-07-16
A method for producing a narrow molecular weight distribution polyalkylene glycol derivative having an amino group at an end under mild conditions. A method for producing a compound of the general formula (1): CH
3
O(CH
2
CH
2
O)
n
CH
2
CH
2
CH
2
NH
2
(wherein n is an integer of 1 to 450) comprises the following steps of:
1) a step of producing a compound of the general formula (3): CH
3
O(CH
2
CH
2
O)
k-1
CH
2
CH
2
O
−
M
+
from a compound of the general formula (2): CH
3
O(CH
2
CH
2
O)
k
H (wherein k is an integer of 2 to 5);
2) a step of producing a compound of the general formula (4): CH
3
O(CH
2
CH
2
O)
n-1
CH
2
CH
2
O
−
M
+
from a compound of the general formula (3);
3) a step of reacting a compound of the general formula (4) with acrylonitrile to obtain a compound of the general formula (5): CH
3
O(CH
2
CH
2
O)
n
CH
2
CH
2
CN; and
4) a step of reducing a compound of the general formula (5) to obtain a compound of the general formula (1).
作者:Asger M. Koue、Fernando Montero、Lars M. Skjolding、Sergey Kucheryavskiy、Marco Maschietti、Christian M. Pedersen
DOI:10.1039/d3gc04252a
日期:——
Multivalent biomass-based H2S scavengers have been prepared in a few steps from cheap and readily available chemicals and evaluated using state-of-the-art in situ Raman spectroscopy under reaction conditions relevant to industrial applications. The chemicals are synthesized based on using carbohydrates as a flexible scaffold, where the exact properties can be tuned to meet specific applications. Different
多价生物质基 H 2 S 清除剂由廉价且容易获得的化学品通过几个步骤制备而成,并在与工业应用相关的反应条件下使用最先进的原位拉曼光谱进行评估。这些化学品是基于使用碳水化合物作为柔性支架而合成的,可以调整其确切的性能以满足特定的应用。可以引入不同的官能团,并且可以通过简单的手段控制溶解度和分配。本文介绍的化学品的开发目的是在石油和天然气工业中用作 H 2 S 清除剂,以限制化石来源化学品的使用。
Kohlensäureester von Polysacchariden und Verfahren zu ihrer Herstellung
申请人:Wolff Walsrode Aktiengesellschaft
公开号:EP0367002A1
公开(公告)日:1990-05-09
Neue Polysaccharidcarbonate werden durch Acylierung von Polysacchariden mit Kohlensäureestern hergestellt und weisen Substitutionsgrade von vorzugsweise 0,5 bis 3 auf.