Polyvinyl pyrolidone-supported chlorochromates: preparation and application as solid phase synthetic oxidising reagent

Zacharias, Jose; Koshy, Ebey P.; Pillai, V. N. Rajasekharan

doi:10.1016/s1381-5148(03)00053-1

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The choice of PVP was preceded by a comprehensive analysis of the literature and by preliminary tests. − The compound has been used as a serum albumin substitute. , Currently it is being used, among others, as a component of artificial tears protecting the eyes against irritation and drying. Complexes of PVP with a strongly bactericidal iodine are commonly used wound disinfectants due to the fact that they are less toxic than iodine. , There are also few literature reports describing attempts to apply PVP as a component of synovial fluids. ,,, Polyvinylpyrrolidone has also been widely used in the pharmaceutical, medical, food, and cosmetics industries. ,,, In living organisms PVP does not undergo chemical changes, is highly biologically resistant, and accumulates in the environment. , High biodegradation resistance is beneficial from the viewpoint of its potential applications in tribology. The compounds will be stable as lubricant components.…”

Section: Introductionmentioning

confidence: 99%

“…Complexes of PVP with a strongly bactericidal iodine are commonly used wound disinfectants due to the fact that they are less toxic than iodine. 11,29 There are also few literature reports describing attempts to apply PVP as a component of synovial fluids. 12,18,22,27 Polyvinylpyrrolidone has also been widely used in the pharmaceutical, medical, food, and cosmetics industries.…”

Section: Introductionmentioning

confidence: 99%

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Polymers (Polyvinylpyrrolidones) As Active Additives Modifying the Lubricating Properties of Water

Sułek¹,

Sas²,

Wasilewski³

et al. 2012

Ind. Eng. Chem. Res.

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Surface active compounds may act as effective additives modifying water lubricity. Their action mechanism consists in the formation of a lubricating film enriched with an active compound. The reasons for the choice of polyvinylpyrrolidones as additives were their physiological inertness and a lack of harmful environmental effects. The tests were carried out on the solutions of two polyvinylpyrrolidones with degrees of polymerization of 450 (PVP 450) and 14400 (PVP 14400). A significant effect of the polymer chain length on physicochemical (viscosity, surface tension, wettability of steel) and tribological properties (resistance to motion, wear, scuffing) has been found. PVP 14400 showed a considerably greater ability to thicken solutions. Over 10 times higher coefficients of viscosity relative to an analogous PVP 450 solution were observed already at a concentration of 5%. A slightly higher ability of PVP 14400 to reduce surface tension was observed. In the case of wettability of steel, a more effective decrease in the wetting angle was observed for PVP 450. However, the differences obtained were not large and usually did not exceed 20%. The measurements of resistance to motion and wear at three constant loads (2000, 3000, 4000 N) as well as tests on antiseizure abilities under a constant velocity increment of load (409 N/s) were carried out using a four-ball tester (T-02 tester). All friction pairs were made of bearing steel. Introducing additives to water significantly affects a decrease in resistance to motion and wear as well as an increase in the ability of a tribological system to prevent seizure. The system did not undergo seizure even at a load of 4 kN. A 2-fold decrease in the coefficient of friction (μ) and an over 30% decrease in the value of wear scar diameters (d) relative to water were observed for PVP 450 and PVP 14400 solutions at 2.0 kN. The use of water as a lubricant led to seizure of the tribological system already at above 2 kN. Addition of the polymers to water also results in a significant improvement in its antiseizure properties. The values of scuffing load (P t) and limiting pressure of seizure (p oz) for individual solutions were even 5 and 15 times higher, respectively, than the values for water. Seizure load (P oz) was also relatively high, and its level was almost two times higher than that for water. The results obtained indicate that polyvinylpyrrolidone used as an additive considerably improves the tribological characteristics of water as a lubricant base.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymers (Polyvinylpyrrolidones) As Active Additives Modifying the Lubricating Properties of Water

Sułek¹,

Sas²,

Wasilewski³

et al. 2012

Ind. Eng. Chem. Res.

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“…14 Heterogeneous polymeric reagents such as poly[vinyl(pyridinium chlorochromate)] and dichromate, 15,16 poly(n-butyl-4-vinylpyridinium)dichromate, 17 poly(4-vinylpyridinium nitrate), 18 poly(N-vinylpyrrolidone)-hydrotribromide, 19 poly(n-butyl-4-vinylpyridinium)periodate, iodate and bromate, 20 polystyrene supported t-butylchromates 21 and poly[vinyl (pyrolidonium chlorochromates)] 22 are among those reported in the literature. Among these, polymer-bound metallic oxidants and especially polymer-supported chromium(VI) reagents have received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Modified polyacrylamide supported chlorochromate as a new polymeric oxidizing agent

Tamami

Heiran

Montazer

2012

JSCS

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Modified polyacrylamide supported chlorochromate was synthesized and used as a versatile and efficient oxidizing agent for the oxidation of various organic compounds such as hydroxyl compounds, silylethers, oximes, thiols, and other compounds. Over oxidation of the products (aldehydes to carboxylic acids) was not observed with this oxidizing agent. The oxidant was insoluble in oxidation media and chromium (VI) ions remained firmly bound to the insoluble polymeric support after the oxidation reaction. The mild reaction condition, easy work-up, short reaction times, regenerability of the reagent and its easy preparation and handling are among the advantages of this new polymeric chlorochromate reagent

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A simple and rapid protocol for the synthesis of phenacyl derivatives using macroporous polymer-supported reagents

Kiasat

Sayyahi

2009

Mol Divers

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Polyvinyl pyrolidone-supported chlorochromates: preparation and application as solid phase synthetic oxidising reagent

Cited by 4 publications

References 14 publications

Polymers (Polyvinylpyrrolidones) As Active Additives Modifying the Lubricating Properties of Water

Polymers (Polyvinylpyrrolidones) As Active Additives Modifying the Lubricating Properties of Water

Modified polyacrylamide supported chlorochromate as a new polymeric oxidizing agent

A simple and rapid protocol for the synthesis of phenacyl derivatives using macroporous polymer-supported reagents

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