Efficient glycosylation of unprotected sugars using sulfamic acid: A mild eco-friendly catalyst
摘要:
Sulfamic acid, a mild and environmentally benign catalyst has been successfully used in the Fischer glycosylation of unprotected sugars for the preparation alkyl glycosides. A diverse range of aliphatic alcohols have been used to prepare a series of alkyl glycosides in good to excellent yield. (C) 2011 Elsevier B.V. All rights reserved.
A polymer stabilizer comprising the following alkoxy compound:
the alkoxy compound: a compound obtained by alkoxylating at least one hydroxyl group contained in a compound of the following formula (1) containing one formyl group or carbonyl group and (n−
1
) hydroxyl groups in the molecule with an alkyl group having 1 to 12 carbon atoms:
C
n
H
2n
O
n
(1)
(wherein, n represents an integer of 3 or more).
The synthesis of a series of alkyl (having from C6 to C20 aglycones), cyclohexyl, and cyclohexylalkyl alpha-d-mannopyranosides, 6-deoxygenated analogs, thioglycosides, and sulfones derived thereof, is reported. Here, under the in vitro assay conditions used, none of the 15 tested compounds acted as an inhibitor of the mannose transfer catalyzed by the enzymes present in mycobacterial membrane and cell
THERMOPLASTIC POLYMER COMPOSITION AND PROCESSING STABILISER
申请人:Kimura Yoshikazu
公开号:US20130032756A1
公开(公告)日:2013-02-07
The present invention provides a thermoplastic polymer composition containing a particular phenol compound or organic phosphoric compound, compound (9) which is compound (9a) represented by C
m
H
2m
O
m
wherein m is an integer of not less than 3 and not more than 10, and having one aldehyde group or ketone group and m−1 hydroxy groups with at least one hydroxy group having been replaced by an alkoxy group represented by —OR
26
wherein R
26
is a C
1-12
alkyl group, and a thermoplastic polymer, and a processing stabilizer containing a particular phenol compound or organic phosphoric compound, and compound (9). A combined use of a particular phenol compound or organic phosphoric compound and compound (9) can improve processing stability of a thermoplastic polymer composition.
A polymer stabilizer comprising the following alkoxy compound:
the alkoxy compound: a compound obtained by alkoxylating at least one hydroxyl group contained in a compound of the following formula (1) containing one formyl group or carbonyl group and (n-1) hydroxyl groups in the molecule with an alkyl group having 1 to 12 carbon atoms:
CnH2nOn (1)
(wherein n represents an integer of 3 or more).
作者:Sébastien Delacroix、Jean-Pierre Bonnet、Matthieu Courty、Denis Postel、Albert Nguyen Van Nhien
DOI:10.1016/j.carres.2013.08.009
日期:2013.11
The use of Bronsted acid ionic liquid (BAIL) as a catalyst for the activation of unreactive and unprotected glycosyl donors has been demonstrated for the first time in aqueous solution. (c) 2013 Elsevier Ltd. All rights reserved.