meta- or para-position are highly effective catalysts for the amide condensation reaction in less-polar solvents. In this paper, we report that N-alkyl-4-boronopyridinium halides are more effective catalysts than the previous ones in more polar solvents. N-Alkyl-4-boronopyridinium halides are effective not only for amide condensation between equimolar mixtures of carboxylic acids and amines but also
[reaction: see text] Boricacid is a highly effective catalyst for the dehydrative esterification reaction between equimolar mixtures of alpha-hydroxycarboxylic acids and alcohols. In contrast, N-methyl-4-boronopyridinium iodide (2a) is a more effective catalyst than boricacid for the similar esterification in excess alcohol. A heterogeneous catalyst, such as N-polystyrene-bound 4-boronopyridinium
Alkaline Nitration. III. The Reaction of Acetone Cyanohydrin Nitrate with Metal Alkoxides<sup>1</sup>
作者:William D. Emmons、Jeremiah P. Freeman
DOI:10.1021/ja01622a073
日期:1955.9
OTSUBO, KENJI;INANAGA, JUNJI;YAMAGUCHI, MASARU, TETRAHEDRON LETT., 28,(1987) N 38, 4435-4436
作者:OTSUBO, KENJI、INANAGA, JUNJI、YAMAGUCHI, MASARU
DOI:——
日期:——
ALPHA-HYDROXYISOBUTYRIC ACID ESTER COMPOUND AND FRAGRANCE COMPOSITION
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:US20220403289A1
公开(公告)日:2022-12-22
A fragrance composition containing a compound represented by Formula (1) as an active ingredient:
where in Formula (1), R
1
represents a chain hydrocarbon group having from 7 to 20 carbons, and may be linear or branched, and a saturated group or an unsaturated group, and when R
1
is an unsaturated group, R
1
may have one or more carbon-carbon double bond(s) or carbon-carbon triple bond(s).