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Formaldehyde reacts with macromolecules, including DNA.

Allergic reactions to cosmetics containing formaldehyde as a pre-servative, especially shampoos, are unusual (Eckardt, 1966) and appearmostly among those who have been sensitized by occupational exposure. Systemic sensitization A case report has been described involving an anaphylactic shockreaction after accidental iv application of formaldehyde duringhaemodialysis treatment due to formaldehyde remaining in the equipmentafter disinfection.

Photolysis and reaction with hydroxyl radicals rapidly removeformaldehyde from the atmosphere.

(1945) The reactions of formaldehyde withamino acids and proteins.

Formaldehyde that escapes metabolism can react withmacromolecules at the site of entry.

These react with OH radicals and ozone toform formaldehyde and/or other aldehydes as intermediates in a seriesof reactions that ultimately lead to the formation of carbon monoxideand dioxide, hydrogen, and water (Zimmermann et al., 1978; Calvert,1980).

Formaldehyde is an inexpensive starting material for a number ofchemical reactions, and a large number of products are made using for-maldehyde as a base.

(1961) The reaction of formaldehyde withpolynucleotides. Aminoplastics (urea formaldehyde resins and melamine formalde- hyde resins) Reaction of formaldehyde with urea or melamine yields urea formal-dehyde (UF) or melamine formaldehyde (MF) (condensation process).

Irritant skin reactions occur through direct contact with formal-dehyde solutions.

In the exposure chamber, a bis-chloromethyl-ether (BCME) concentration of 0.5-2 µg/m3, due to the chemicalreaction of formaldehyde and hydrogen chloride, was estimated.

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Mechanism of the initial reaction of formaldehydewith DNA.

(1979) Reaction of formal-dehyde with calf-thymus nucleohistone.

Formaldehyde protects dietary-protein frommicrobial proteolysis in the rumen by reacting with free amino groupsin the protein, forming inter- and intramolecular methylene bridges(Siddons et al., 1982).

Hantzsch Dihydropyridine (Pyridine) Synthesis

Formaldehyde also reacts with proteins (French & Edsall, 1945) andnucleic acids (Haselkorn & Doty, 1961; Lewin, 1966; Collins & Guild,1968; Feldman, 1973; Chaw et al., 1980); it reacts with single-strandDNA, but not with double-stranded DNA.

Hantzsch pyridine synthesis - Wikipedia

8.7.1 Reactions with macromolecules Formaldehyde reacts readily with a variety of cellular nucleo-philes, including glutathione, forming adducts of varying stability(Feldman, 1973; Uotila & Koivusalo, 1974; McGhee & von Hippel, 1975).

Hantzsch pyridine synthesis - overview - ChemTube3D

4.2.1 Special products of degradation under specific conditions Highly carcinogenic bis(chloromethyl)ether can be produced by acondensation reaction between formaldehyde and hydrogen chloride(Thiess et al., 1973; Nelson, 1977; Albert et al., 1982; Sellakumar etal., 1985).

Hantzsch Dihydropyridine Synthesis

It has been shown that sensory irritation is the earliest humanreaction to formaldehyde, both in exposure studies and from complaintsabout indoor environments.

is known as the Hantzsch dihydropyridine synthesis and the ..

Since differences in indi-vidual reactions to formaldehyde are large in both the normal popu-lation and in hyperreactive and sensitized persons, it is difficult toestimate a concentration guaranteed not to produce negative reactionsin the general population.

Kröhnke pyridine synthesis - Wikipedia

Formaldehyde reacts withsulfur dioxide (SO2) and gives off relatively concentrated hydroxy-methanesulfonic acid, whereby SO2 may contribute to the acid contentof precipitation without preceding oxidation to sulfuric acid, which isa relatively slow process.

Pyridine synthesis - Organic chemistry

There is no evidence in the literature of allergic reactivity ofthe mucous membranes of the eyes being caused by airborne formaldehydeor by formaldehyde solutions.

mechanism of the hantzsch pyridine synthesis: ..

HCHO + h v -> H2 + CO (9) -> H + HCO (10) Formaldehyde is also removed from the troposphere by reaction withthe OH radical (Stief et al., 1980).

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