Abstract:
The present invention relates to a novel simple, efficient and single-step process for esterification of aldehydes using a heterogeneous catalyst with high yields. More particularly, the present invention relates to a novel simple, efficient and single-step process for esterification of aldehydes using Titanium superoxide with greater than 80% yields.
Abstract:
Disclosed herein is a simple process for functionalization/grafting of carbon microspheres obtained from bagasse with various active functional groups onto it and use of the same as catalyst for various organic reactions, having very high selectivity and conversion rate.
Abstract:
The invention relates to a continuous method for producing nitrobenzene by nitriding benzene by means of nitric acid or mixtures of nitric acid and sulfuric acid to form raw nitrobenzene, washing the raw nitrobenzene by means of at least one acidic, alkaline, and neutral wash, respectively, wherein a prepurified nitrobenzene is obtained, comprising at least light boilers, optionally medium boilers, and high boilers and salts in addition to nitrobenzene, wherein the prepurified nitrobenzene is further purified by separating light boilers in a distillation apparatus by evaporating the light boilers and separating nitrobenzene from the further purified nitrobenzene thus obtained in a distillation apparatus by partially evaporating nitrobenzene, wherein pure nitrobenzene is removed from the distillation apparatus in gaseous form and then condensed, and wherein the non-evaporated part of the further purified nitrobenzene is fed back into the wash at an arbitrary point.
Abstract:
Methods and compositions are provided for the direct catalytic asymmetric aldol reaction of aldehydes with donor molecules selected from ketones and nitroalkyl compounds. The reactions employ as catalyst a Group 2A or Group 2B metal complex of a ligand of formula (I), as defined further herein.
Abstract:
A method of obtaining 2-bromine-4,6-dinitrochlorobenzene from chlorobenzene preliminarily treated with a mixture of sulphuric and nitric acids or from individual o-, p-nitrochlorobenzenes or from a eutectic mixture of o-, p-, m-nitrochlorobenzenes, any of said substances being treated at a temperature of 20-120°C by bromine or bromide of an alkaline metal, by the nitric acid or by nitrate of an alkaline metal and sulphuric acid or oleum in the following molar ratio of the reagents: the initial substance: bromine or a bromide of an alkaline metal: nitric acid or nitrate of an alkaline metal: sulphuric acid or oleum equalling 1.0:0.5-1.5 or 1.0-3.0:2.0-4.0 or 2.5-5.0:6.0-70.0.
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von 5- Nitro-1,4-naphthochinonen der Formel worin R Wasserstoff, C₁-C₄-Alkyl oder C₁-C₄-Alkoxy ist, durch Oxidation von 1-Nitronaphthalin oder entsprechend substi tuierter 1-Nitronaphthaline, das dadurch gekennzeichnet ist, dass man die Reaktion mit Mangan-III-sulfat als Oxidations mittel durchführt. Das verbrauchte Mangan-III-sulfat lässt sich mit guter Stromausbedeute elektrolytisch regenerieren. Das Verfah ren ist umweltfreundlich, da das Oxidationsmittel und gege benenfalls auch das Lösungsmittel wiederverwendet wer den.
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von 5-Nitro-1,4-naphthochinonen der Formel worin R Wasserstoff, C 1 -C 4 -Alkyl oder C 1 -C 4 -Alkoxy ist, durch Oxidation von 1-Nitronaphthalin oder entsprechend substituierter 1-Nitronaphthaline, das dadurch gekennzeichnet ist, dass man die Reaktion mit Mangan-III-sulfat als Oxidationsmittel durchführt. Das verbrauchte Mangan-III-sulfat lässt sich mit guter Stromausbedeute elektrolytisch regenerieren. Das Verfahren ist umweltfreundlich, da das Oxidationsmittel und gegebenenfalls auch das Lösungsmittel wiederverwendet werden.