A Novel Olefination of Carbonyl Compounds with Dibromomalonate Promoted by Dibutyl Telluride
作者:Zhang-Lin Zhou、Li-Lan Shi、Yao-Zeng Huang
DOI:10.1080/00397919108019792
日期:1991.4
Abstract α,β-Unstaturated malonic esters are conveniently synthesized from the reaction of dibromomalonate with carbonyl compounds promoted by dibutyltelluride in exellent yields. A possible mechanism involving twice halophilic attacks of dibutyltelluride is proposed. This methodology provides a facile route to α,β-unsaturated malonic esters and represents an alternative to the Knoevenagel reaction
2-C-Substituted Propane-1,3-Dicarbonyl Compounds and Their Use in Neutralising Malodour
申请人:Flachsmann Felix
公开号:US20080305066A1
公开(公告)日:2008-12-11
Use of a compound of formula 1 as malodour neutraliser
wherein A, B, Y and Y have the same meaning as given in the specification, and personal care products comprising the same.
A method of providing a fragrant odour to an application, comprising the addition thereto of at least one compound of the formula I
wherein X and Y are independently selected from the group consisting of —CR
1
R
2
R
3
, —NR
4
R
5
and —OR
6
, wherein R
1
to R
5
are selected from H and essentially hydrocarbon moieties that optionally comprise at least one oxygen, nitrogen or silicon atom, and R
6
is selected from essentially hydrocarbon moieties that optionally comprise at least one oxygen, nitrogen or silicon atom; and, A is an essentially hydrocarbon moiety that optionally comprises at least one oxygen, sulphur, nitrogen or silicon atom, with the proviso that the compound A-CHO is a fragrant aldehyde. The use of these compounds in laundry, household and personal care products confers a long-lasting freshness.
A method of providing a fragrant odour to an application, comprising the addition thereto of at least one compound of the formula (I) wherein X and Y are independently selected from the group consisting of —CR
1
R
2
R
3
, —NR
4
R
5
and —OR
6
, wherein R
1
to R
5
are selected from H and essentially hydrocarbon moieties that optionally comprise at least one oxygen, nitrogen or silicon atom, and R
6
is selected from essentially hydrocarbon moieties that optionally comprise at least one oxygen, nitrogen or silicon atom; and A is an essentially hydrocarbon moiety that optionally comprises at least one oxygen, sulphur, nitrogen or silicon atom, with the proviso that the compound A-CHO is a fragrant aldehyde. The use of these compounds in laundry, household and personal care products confers a long-lasting freshness.