CATATLYST COMPONENTS FOR THE POLYMERIZATION OF OLEFINS
申请人:BASELL POLIOLEFINE ITALIA S.R.L.
公开号:US20220332856A1
公开(公告)日:2022-10-20
A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti and an electron donor of formula (I)
where the R
1
and R
5
groups, equal to or different from each other, are selected from C
1
-C
15
hydrocarbon groups, R
2
group is selected from C
2
-C
10
hydrocarbon groups, R
3
to R
4
groups, independently, are selected from hydrogen or C
1
-C
20
hydrocarbon groups, optionally fused together to form one or more cycles, with the proviso that at least one of R
3
to R
4
groups is a C
1
-C
20
alkyl group.
Base-Promoted C→N Acyl Rearrangement: An Unconventional Approach to α-Amino Acid Derivatives
作者:Iratxe Ugarriza、Uxue Uria、Luisa Carrillo、Jose L. Vicario、Efraim Reyes
DOI:10.1002/chem.201402514
日期:2014.9.8
N‐alkyl aminomalonates undergo a fast and selective intramolecular C→N acylrearrangement reaction in the presence of a strong base, leading to N‐protected glycinates in excellent yield. Moreover, the fact that the reaction proceeds through a nucleophilic enolate intermediate has been used for implementing a tandem rearrangement/alkylation sequence that has been applied to the preparation of synthetically