This application relates to derivatives of hydrocarbon terpenes (e.g., myrcene or farnesene), to methods of making the derivatives, and to the use of the derivatives as surfactants.
Diastereoselective thermal [3+2] cycloaddition reactions of nitrone possessing an amide functional group as hydrogen bond donor/acceptor
作者:Ayhan Yıldırım
DOI:10.1007/s10593-020-02668-7
日期:2020.3
High diastereoselectivity in the [3+2] cycloadditionreactions of a series of maleimides with a nitrone capable of hydrogen bonding have been carried out. The cycloadditionreaction proceeded in highly diastereoselective manner leading to novel pyrrolo[3,4-d]isoxazolidines with good yields. NMR studies revealed that in the performed cycloadditionreactions, a pair of diastereomers are formed in all
在一系列马来酰亚胺与能够氢键的硝酮的[3 + 2]环加成反应中,已经实现了高非对映选择性。环加成反应以高度非对映选择性的方式进行,从而以高收率产生了新型吡咯并[3,4- d ]异恶唑烷。NMR研究表明,在进行的环加成反应中,在所有情况下均会形成一对非对映异构体,顺式非对映异构体是最受欢迎的环加合物,其de值高达90%。看来在硝酮的苯基部分存在酰胺官能团会影响环加成反应和顺式中的非对映体比率立体选择性很可能取决于该基团的存在。在分子电子密度理论的框架内解释了环加成过程的性质。
OXYGEN SCAVENGERS
申请人:M&G USA Corporation
公开号:US20140220281A1
公开(公告)日:2014-08-07
Described herein are oxygen scavengers, oxygen scavenging polymeric compositions, and oxygen scavenging articles. The polymeric compositions comprising the oxygen scavengers may have utility in packaging, sealing, wrapping, and storing oxygen-sensitive substances, e.g., to preserve freshness of foods, beverages, and the like.
A separation membrane comprising a resin being constituted of the repeating unit represented by the general formula (I) and having a number average molecular weight of not less than 1 x 103 in polystyrene equivalent:
where R1 denotes an alkyl group of 1 - 20 carbons, a fluoroalkyl group of 1 - 20 carbons, or a group represented by the general formula: -(-X-)m-(SiR2R3-)n-R4, or -(-X-)m-(-SiR2R3O-)n-SiR4R5R6 (wherein X is an alkylene group of 1 - 8 carbons or a phenylene group of 6 - 12 carbons; m is 0 or 1; n is an integer of 1 - 20; R2, R3, R4, Rs, and R6 are respectively a group, having 1 - 8 cabons, selected from an alkyl group, a cycloalkyl group, a phenyl group, an alkoxyl group, and a fluoroalkyl group, and may be the same with or different from each other).