Peroxides. III.² Structure of Aliphatic Peracids in Solution and in the Solid State. An Infrared, X-Ray Diffraction and Molecular Weight Study³

Abstract

Aliphatic Peracids in Solution and Solid State 5537 yielded a 2,4-dinitrophenylhydrazone, m.p. 122.5-123°, undepressed by admixture with an authentic sample.29 The 2,4-dinitrophenylhydrazone of isovaleraldehyde, m.p. 125.5-126°, strongly depressed the melting point of the above sample.Neopentyl Iodide with Bromine.-Neopentyl iodide (92.0 mmoles) reacted with bromine (93.3 mmoles) in petroleum ether for 1.25 hours at -78°and 1.5 hours at 0°g ave a very small amount (0.57 g., 4%) of an impure low boiling fraction, «22d 1.4448, b.p. 55-58°( 120 mm.), micro b.p. 106°; re-ported30 for ¿-amyl bromide, b.p. 108°(765 mm.), «20d 1.4421. There was not enough to refractionate.Analysis was obtained on a similar material, probably tamyl bromide, from an earlier run, b.p. 50.5-52°( 115 mm.), «25d 1.4370.

Experimental Investigation of the Primary and Secondary Deuterium Kinetic Isotope Effects for Epoxidation of Alkenes and Ethylene with m-Chloroperoxybenzoic Acid

“…There are several factors that could account for the insensitivity and small size of the observed primary DKIEs. It has been shown that peracids form intramolecular hydrogen-bonded species in dilute solutions of inert solvents, i.e., benzene, carbon tetrachloride, and dichloromethane . The H-bonding to the carbonyl oxygen of the peracid would have the effect of lowering the difference in the vibrational zero point energies for the O−H and O−D bonds in the ground state, which in turn lower the primary DKIE.…”

Nanoscale graphene oxide sheets as highly efficient carbocatalysts in green oxidation of benzylic alcohols and aromatic aldehydes

“…However, the peak for the n→π* transition of the C=O bonds shifted to 284 nm for the NGO after oxidation. This red shift, which was attributed to inter-and intramolecular hydrogen bonding of peroxy acids [77], confirms the formation of peroxy acids from carboxylic acids on the NGO under the oxidation reaction conditions. The turnover number (TON) was calculated as a ratio of the amount of oxidized product to the mass of NGO.…”

Photooxidative Degradation and Conformational Changes in Syndiotactic Polypropylene/Clay Nanocomposites

“…However, some studies have related these two bands to the H-bonded association of the carboxylic acids and hydroxyl groups. 19,36 In addition, Swern et al 38 mentioned that the band at 1743 cm À1 is assigned to the formation of peracids. The band at 1711 cm À1 can be attributed to absorption of carboxylic acids 7,15,16 or to their dimer form.…”