A novel synthesis of α-hydroxy- and α,α′-dihydroxyketone from α-iodo and α,α′-diiodo ketone using photoirradiation
摘要:
A novel reaction of alpha-iodo ketone (alpha-iodocycloalkanone, alpha-iodo-beta-alkoxy ester, and alpha-iodoacyclicketone) with irradiation under a high-pressure mercury lamp gave the corresponding alpha-hydroxyketone in good yields. In the case of alpha,alpha'-diiodo ketone, alpha,alpha'-dihydroxyketone which little has been reported until now was obtained. This reaction affords a new, clean and convenient synthetic method for alpha-hydroxy- and alpha,alpha'-dihydroxyketone. (C) 2003 Elsevier Ltd. All rights reserved.
[EN] REARRANGEMENT OF DIMETHYLPHENYLACYLATES USING ZEOLITES<br/>[FR] RÉARRANGEMENT DE DIMÉTHYLPHÉNYLACYLATES À L'AIDE DE ZÉOLITES
申请人:DSM IP ASSETS BV
公开号:WO2021156214A1
公开(公告)日:2021-08-12
The present invention relates to a Fries rearrangement of specific dimethylphenylacylates to form the desired respective hydroxyaryl ketones having two methyl groups bound to the aromatic ring. It has been found that the process is surprisingly very specific in view of the number and position of the methyl group(s) bound to the aromatic ring.
[EN] PROCESS FOR THE PURIFICATION OF HYDROXYARYL-ALDHYDES AND KETONES AND THEIR USE IN THE PRODUCTION OF HYDROXYARYL OXIME DERIVATIVES<br/>[FR] PROCESSUS DE PURIFICATION D'HYDROXYARYL ALDEHYDES ET CETONES ET LEUR UTILISATION DANS LA PRODUCTION DE DERIVES D'HYDROXYARYL OXIME
申请人:CYTEC TECH CORP
公开号:WO2004054954A1
公开(公告)日:2004-07-01
A process for the purification of hydroxyaryl aldehydes and ketones comprising the following steps; 1) adding a mineral acid to a first composition comprising a hydroxyaryl aldehyde or a hydroxyaryl ketone; 2) washing the mixture obtained in step 1 with water; 3) isolating a second composition comprising a hydroxyaryl aldehyde or a hydroxyaryl ketone from step 2.
Optical parts and sulfur-containing poly (thio)ester (co)polymer
申请人:——
公开号:US20030204030A1
公开(公告)日:2003-10-30
A poly(thio)ester (co)polymer which comprises a repeating structural unit represented by the formula (1-A) as an essential structural unit:
1
[wherein R
11
is a divalent aliphatic hydrocarbon group which may contain at least one sulfur atom in a sulfide group; R
12
is a mono- or poly-cyclic aliphatic or aromatic dicarboxylic acid residue; and X
11
and X
12
are each independently an oxygen atom or sulfur atom, and when X
11
and X
12
are the oxygen atoms, R
11
is a divalent aliphatic hydrocarbon group containing at least one sulfur atom in the sulfide group]; and an optical component obtainable by molding the poly(thio)ester (co)polymer. The poly(thio)ester (co)polymer is excellent in transparency and optical characteristics (e.g., a higher refractive index, higher Abbe number, and lower birefringence), and has also good mechanical characteristics and thermal characteristics, and further is excellent in melt fluidity and injection moldability.
Multifunction "Crown Complexes" from Amino Acids and Peptides for Skin and Hair Restoration
申请人:Gupta K Shyam
公开号:US20070099886A1
公开(公告)日:2007-05-03
This invention relates to Schiff's bases derived from amino acids and hydroxyaryl alkyl ketones, or a plant extract containing the same, having general chemical structure in FIG.
1
for topical application. This invention also relates to certain metal complex of said Schiff's bases, which have a crown-like appearance in their three-dimensional chemical structure, as in FIG.
2
. The Schiff's bases and their metal complexes of the present invention are useful for the modulation of metal-activated enzymes and metalloenzymes, such as Phenylalanine Hydroxylase, Tyrosine Transaminase, Phenylalanine Transaminase, Tyrosinase, various MMP (Matrix metalloproteases), Superoxide dismutase, 5-Alpha Reductase, and citrate lyase. These are further suitable for multifunctional topical methods for skin whitening, skin wrinkles reduction, skin antiaging, collagen synthesis, acne control, hair loss prevention, hair graying control, and facial oil control.
Hair Loss Prevention by Natural Amino Acid and Peptide Complexes
申请人:GUPTA SHYAM K
公开号:US20090253668A1
公开(公告)日:2009-10-08
This invention relates to certain skin and hair care agents of formula (I), derived from natural amino acids and peptides. These agents provide multi-functional treatment of enzyme-related skin, hair and scalp problems, for example, hair aging including premature hair loss and hair graying; male pattern baldness; hair loss from dandruff; alopecia; split ends, acne, darkened skin, dark circles around eyes, stretch marks, wrinkles and fine lines, loss of collagen, loss of skin pliability and combinations thereof: