Indium trichloride-promoted tin-mediated carbonyl allylation in water: High simple diastereo- and diastereofacial selectivity
作者:Xu-Ran Li、Teck-Peng Loh
DOI:10.1016/0957-4166(96)00174-7
日期:1996.6
Tin-mediated additions of allylic bromides to aldehydes and aldoses leads to adduct with high diastereo- and diastereofacial selectivity in the presence of indiumtrichloride in water.
Method for preparing acetal-containing compositions
申请人:Xie Chunping
公开号:US20060079720A1
公开(公告)日:2006-04-13
An acetal compound may be formed by the method of reacting a substitiuted or unsubstituted benzaldehyde, a polyhydric alcohol, and an at least one acid catalyst at ambient temperatures, in a homogenous reaction media in the presence of at least one water miscible organic solvent. The molar ratio of the acid catalyst to the benzaldehyde may be less than about 0.6 to 1, respectively, of acid catalyst to benzaldehyde.
sources is limited. Thus, in order to investigate their biological function, the development of facile and adaptable routes to this class of compounds is of fundamental importance. Our synthetic route towards these target molecules makes use of readily accessible pentoses and hexoses, which are subjected to indium-mediated two-carbon chain elongation. Subsequent ozonolysis and treatment with base yields
An acetal-based composition useful as a nucleating, gelling, thickening or clarifying agent is disclosed. The composition may be synthesized or provided in many different forms, including multicarbon diacetals formed from carbohydrates. Once synthesized, the compound may be employed as an additive in a plastic composition, such as (for example) a polypropylene copolymer. One structure of such an acetal-based composition is provided by the formula:
wherein: n is 0, 1 or 2;
Ar
1
and Ar
2
are independently selected from substituted or unsubstituted aryl-containing groups; and R is selected from the group consisting of: alkenyls, alkyls, alkoxy, hydroxyl alkyls, and alkyl-halides.
Method of nucleating a polyolefin composition with acetal-based compounds
申请人:Xie Chunping
公开号:US20050239926A1
公开(公告)日:2005-10-27
An acetal-based composition useful as a nucleating, gelling, thickening or clarifying agent is disclosed. The composition may be synthesized or provided in many different forms, including multicarbon diacetals formed from carbohydrates. Once synthesized, the compound may be employed as an additive in a plastic composition, such as (for example) a polypropylene copolymer. Co-additives may also be employed. Several aryl structures may reside upon the hydrocarbon chain backbone. One structure of such an acetal-based composition which happens to have two aryl-containing groups is shown:
wherein: n is 0, 1 or 2;
Ar
1
and Ar
2
are independently selected from substituted or unsubstituted aryl-containing groups; and R is selected from the group consisting of: alkenyls, alkyls, alkoxy, hydroxyl alkyls, and alkyl-halides.