Presence Of Wet SiO2 Research Articles

OXIDATION OF 1,2-DIHYDROQUINOLINES UNDER MILD AND HETEROGENEOUS CONDITIONS

A combination of NaHSO4.H2O and Na2Cr2O7.2H2O in the presence of wet SiO2 were used as an effective oxidizing agent for the oxidation of 1,2-dihydroquinolines to their corresponding quinoline derivatives in dichloromethane at room temperature with excellent yields.

N-NITROSATION OF SECONDARY AMINES UNDER MILD AND HETEROGENEOUS CONDITIONS

A combination of potassium monopersulfate and sodium nitrite in the presence of wet SiO2 was used as an effective nitrosating agent for the nitrosation of secondary amines to their corresponding nitroso derivatives under mild and heterogeneous conditions in excellent yields.

CHEMOSELECTIVE N-NITROSATION OF SECONDARY AMINES UNDER MILD AND HETEROGENEOUS CONDITIONS

A combination of iodic or periodic acids and sodium nitrite in the presence of wet SiO2 was used as an effective nitrosating agent for the nitrosation of secondary amines to their corresponding nitroso derivatives under mild and heterogeneous conditions in excellent yields.

OXIDATION OF URAZOLES TO THEIR CORRESPONDING TRIAZOLINEDIONES UNDER MILD AND HETEROGENEOUS CONDITIONS VIA IN SITU GENERATION OF NO+IOX −

A combination of periodic or iodic acids and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with good yields.

Oxidation of Benzyl Alcohols under Mild Heterogeneous Conditions

A combination of iodic acid with ammonium dichromate in the presence of wet SiO2 was used as an efficient oxidizing agent for the transformation of benzyl alcohols to the corresponding aldehydes and ketones in n-hexane or without a solvent at room temperature with excellent yields.

Aromatization of 1,4-Dihydropyridines Under Mild and Heterogeneous Conditions

A combination of Mg(HSO4)2 and NaNO2 in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of dihydropyridines to their corresponding pyridine derivatives at room temperature with moderate to excellent yields.

ChemInform Abstract: An Efficient Method for the Oxidation of Urazoles under Mild and Heterogeneous Conditions.

Abstract A combination of inorganic acidic salts or silica gelsupported inorganic acids and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogenous conditions in good yields. Silica gel supported nitric acid and ceric ammonium nitrate (CAN) are also capable of effecting these oxidations in the absence of sodium nitrite in moderate to good yields. Mg(HSO4)2 is a superior to all the aforementioned reagents in convenience, yield and purity of the isolated triazolinediones.

Chemoselective N-nitrosation of secondary amines under mild and heterogeneous conditions via in situ generation of NOCl

A combination of inorganic chloride salts [e.g. WCl6, AlCl3 and ZnCl2] and sodium nitrite in the presence of wet SiO2 were used as an effective nitrosating agent for the nitrosation of secondary amines to their corresponding nitroso derivatives under mild and heterogeneous conditions in moderate to excellent yields.

Oxidation of 1,4-Dihydropyridines under Mild and Heterogeneous Conditions

A combination of NaHSO4.H2O and NaNO2 in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of dihydropyridines to their corresponding pyridine derivatives at room temperature with excellent yields.

An Efficient Method for the Oxidation of Urazoles Under Mild and Heterogeneous Conditions

A combination of inorganic acidic salts or silica gelsupported inorganic acids and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogenous conditions in good yields. Silica gel supported nitric acid and ceric ammonium nitrate (CAN) are also capable of effecting these oxidations in the absence of sodium nitrite in moderate to good yields. Mg(HSO4)2 is a superior to all the aforementioned reagents in convenience, yield and purity of the isolated triazolinediones.

An Efficient Method for N-Nitrosation of Secondary Amines Under Mild and Heterogeneous Conditions

A combination of inorganic acidic salts or silica gel supported inorganic acids and sodium nitrite in the presence of wet SiO2 was used as an effective nitrosating agent for the nitrosation of secondary amines to their corresponding nitroso drivatives under mild and heterogeneous conditions in moderate to excellent yields. Mg(HSO4)2 and NaHSO4 are superior to all the aforementioned reagents in convenience, yield and purity of the isolated nitrosoamines.

An Efficient and Chemoselective Method for the Oxidation of 1,4-dihydropyridines under mild and heterogeneous conditions

A combination of inorganic acidic salts or oxalic acid dihydrate and sodium nitrate in the presence of wet SiO2 was used as an effective oxidising agent for the oxidation of dihydropyridines to their corresponding pyridine derivatives at 40–50 oC with excellent yields.

An Efficient Method for the Oxidation of Hantzsch 1,4-Dihydropyridines to their Corresponding Pyridine Derivatives Under Mild and Heterogeneous Conditions

A combination of oxalic acid dihydrate and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of dihydropyridines to their corresponding pyridine derivatives at room temperature with excellent yields.

A Convenient Method for the Oxidation of Urazoles to Their Corresponding Triazolinediones Under Mild and Heterogeneous Conditions with Sodium Nitrite and Oxalic Dihydrate

A combination of oxalic acid dihydrate and sodium nitrite in the presence of wet SiO2, was used as an effective oxidizing agent for the oxidation of urazoles and bisurazoles to their corresponding triazolinediones at room temperature with good yieldr.