Originally, the term was confined to derivatives of aldehydes (one R = H), but it now applies equally to derivatives of ketones (neither R = H ). Mixed acetals have different R' groups. (periodni.com)
acetals can be hydrolysed back to aldehydes (ketone) in acidic solutions. (periodni.com)
iii) Semicarbazones are derivatives of aldehydes and ketones and are produced by the action of semicarbazide on them in weak acidic medium. (psebsolutions.com)
vi) Oximes are produced when aldehydes or ketones react with hydroxylamine in weak acidic medium. (psebsolutions.com)
ix) 2, 4-Dinitrophenythydrazones (i.e., 2, 4-DNP derivatives) are produced when aldehydes or ketones react with 2, 4-dinitrophenyl hydrazine in weakly acidic medium. (psebsolutions.com)
Ketone6
Acetals are organic compounds having the structure R 2 C(OR') 2 (R' ≠ H). They are organic compounds formed by addition of alcohol molecules to aldehyde or ketone molecules. (periodni.com)
In this study, PLLA with the chain-end modification by ketone acetal bond were designed to improve pH-responsiveness. (naist.jp)
PLLA particles with hydrophilic moiety connected by vanillin-based initiators are featured in the design of five- and six-membered ring diol-ketone acetal which derives from vanillin and diol triethylene glycol (diol-OEG3). (naist.jp)
It is expected that the present results will contribute to oral health care research in the future, because the control of particle aggregation rate under physiological conditions could be controlled by the molecular weight of PLA, and the ring-type cyclic diol-ketone acetal. (naist.jp)
Its synthesis is a two-step process starting from a pyridyl-alcohol in which the ketone moiety is protected as a cyclic acetal. (mdpi.com)
Therefore, fragment 16 was transformed into the silyl enol ether and the following hetero Diels-Alder reaction with subsequent acidic deprotection gave unsaturated ketone in good enantioselectivity and yield. (organicchemistry.eu)
Ketene1
It was clearly suggested by (i) the intramolecular cyclization of ketene N,S -acetals 7 to the corresponding thiophenes 8 , (ii) 1 H NMR studies of Meldrum's acid-substituted aminothioacetals 9 , and (iii) substitution studies of the methoxy group on Meldrum's acid containing N,S -acetals 9b . (beilstein-journals.org)
Copolymer3
Interstate Plastics carries sheet grades of copolymer acetal that are readily machined with standard machining practices. (interstateplastics.com)
With the aim of addressing this paradox, a self-therapeutic, curcumin-derived copolymer was synthesized by conjugation with PEGylated biotin via enzyme- and acid-labile ester and acetal linkages. (bvsalud.org)
US5811471A ] A germicidal absorptive material for use in surgical packings, sanitary tampons and similar uses is provided by a sponge-like matrix of polyvinyl alcohol-acetal copolymer to which is tightly bound a germicidal disinfectant dye. (epo.org)
Hydrolysis2
Acetal is used in hot water applications up to 140�F without any hydrolysis effect. (interstateplastics.com)
Alkylation of the alcohol followed by hydrolysis of the acetal afforded the title compound in 52% overall yield. (mdpi.com)
Hemiacetal3
2. The process as claimed in claim 2, wherein the aldehyde employed is an aliphatic or aromatic aldehyde having one or two aldehyde groups, hemiacetal or full acetal groups or mixtures thereof. (everypatent.com)
3. The process as claimed in claim 2, wherein a mixture of aldehyde and its full acetal and/or hemiacetal, in which the aldehyde content can be 1-99%, is employed. (everypatent.com)
The present invention provides a multicomponent composition that is substantially isocyanate-free and comprises a polycarbamate as a first component having a filler, pigment, extender or matting agent and a second component containing an acidic catalyst, an alkanol having one OH group, a polyaldehyde and an acetal or hemiacetal of the polyaldehyde. (epo.org)
Ketals1
Why do orthoesters react with Grignard reagents, but acetals and ketals don't? (stackexchange.com)
Acetate1
The free alcohol was again protected, this time as acetate and also the acetal was acetate protected yielding in 19 in 5 steps from 18 . (organicchemistry.eu)
Alkaline2
The hydrolytic stability of these resins makes them resistant to water absorption in aqueous acidic and alkaline environments. (machinedesign.com)
Ideal for water based, acidic & alkaline products. (tfpumps.com)
Alcohols1
The acidic character of alcohols is due to the polar nature of the O-H bond. (topperlearning.com)
Methylene2
Polyvinyl alcohol-acetal polymer shows exceptional avidity for a number of disinfectant dyes, both acidic and basic, such as methylene blue and gentian violet. (epo.org)
ArChem Methylal is also known as formaldehyde dimethyl acetal, methylene dimethyl ether, and methoxymethyl methyl ether. (archemco.com)
React2
Why does the Grignard reagent not react as a base in case of ketones even though the α-hydrogen atom in case of ketones is acidic? (stackexchange.com)
For example, the carbonyl is converted into an acetal, which does not react with hydrides. (assemblymade.com)
Imines1
Interestingly, imines-amines conversion was able to use as a key responsive for cutting off the hydrophilic moieties on the surface of poly(L-lactide) (PLLA) bearing hydrophilic moiety at acidic condition. (naist.jp)
Derivative2
These results indicate that a chain end with a six-membered ring acetal derivative is aggregated more rapidly than a five-membered ring. (naist.jp)
pH-Responsive Aggregation of Poly(L-lactide) Particles Bearing Hydrophilic Moiety Connected with Vanillin and Cyclic Acetal. (naist.jp)
Spectroscopy1
UV-vis spectroscopy provided evidence of an accelerated acetal degradation at pH 4.0 and 5.0. (bvsalud.org)
Cleavage1
The l,l'-sulfide Q has been obtained from ~ by condensation with the l-tosylate 6 followed by cleavage of the acetal groups. (org.pk)
Alcohol3
In the reaction of benzyl benzoate with sodium methoxide, and methyl benzoate with sodium benzyloxide, he observed a white precipitate which under acidic conditions yields benzyl benzoate, methyl benzoate, methanol, and benzyl alcohol. (wikipedia.org)
Acetal, 1,1-diethoxyethane (CH 3 CH(OC 2 H 5 ) 2 ), is an organic compound, pleasant smelling, formed by addition of ethyl alcohol to ethanal (acetaldehyde). (periodni.com)
Never use scouring powder, steel wool, a descaling agent or a detergent that is acidic or contains alcohol or an abrasive. (strandbathrooms.com)
High Strength3
Acetal (Polyoxymethylene or POM) provided by Interstate Plastics is a tough, machinable thermoplastic with a high modulus of elasticity, high strength, good rigidity, dimensional stability, and resistances to moisture, chemicals and solvents. (interstateplastics.com)
Produced from our proprietary resin grades, Ertalyte® PET FG (Food Grade) is an unreinforced, semi-crystalline grade that is characterized by its excellent wear resistance, low coefficient of friction, high strength, and resistance to moderately acidic solutions. (mcam.com)
The material is characterized by the best dimensional stability in combination with excellent wear resistance, a low coefficient of friction, high strength and resistance to moderately acidic solutions. (lakwijk.nl)
Hydrogen1
Hydrogen atom at the 2-N is most acidic due to presence of electron-withdrawing group. (gpatindia.com)
Resistant1
For example, creep at 210°F is less than that of acetal or heat-resistant ABS at room temperature. (machinedesign.com)
Groups1
ii) gem-Dialkoxy compounds in which the two alkoxy groups are present on the terminal carbon atom are called acetals. (psebsolutions.com)
Resistance1
Acetal is ideal when working in wet environments as it absorbs minimal amounts of moisture, and with a high level of heat resistance, can be heated or cooled without affecting form or dimensionality. (interstateplastics.com)
Environments1
A low coefficient of friction (COF) alongside excellent wear properties, especially in wet or moist environments, makes acetal one of the most widely used engineering thermoplastics on the market today. (interstateplastics.com)
Temperatures1
Due to rigidity, resilience, toughness and strength, acetal does not become brittle even with long-term exposure to unfavorable conditions including extremely high temperatures. (interstateplastics.com)
Conditions3
The in vitro release studies revealed a controlled release of DOX under acidic conditions and curcumin release in response to the enzyme. (bvsalud.org)
Let's go through this equilibrium under acidic conditions . (mendelset.com)
Remember that under acidic conditions, most species are either neutral or positively charged, and rarely negatively charged. (mendelset.com)
Water1
Unlike other materials that may erode from acidic water, hard water does not harm acetal. (interstateplastics.com)
Medium1
Binuclear Mo(VI) and W(VI) complexes of nicotinamide, [M204L(OH)4] (where M = Mo (vI) or W(VI) and L = nicotinamide) have been synthesized in acidic medium and characterized. (org.pk)
Strength2
This grade is capable of sustaining high loads, and retains more of its original strength up to 180° F / 85° C than nylons or acetals. (mcam.com)
It therefore, decreases the acidic strength. (ncertguess.com)
Plastic1
Acetal plastic is available in extruded rod and sheets for machined parts. (interstateplastics.com)
Applications1
First of all, we have developed pH-degradable thermoresponsive polymers for biomedical applications based on a comonomer having a cyclic acetal side chain. (xjtu.edu.cn)