Nitrogen-containing, preparation

Outline the laboratory preparation of a sample of dinitrogen tetroxide. Describe and explain what happens when it is heated from 290 K to 900 K. Suggest electronic structures for dinitrogen tetroxide and the other nitrogen-containing molecules formed from it on heating to 900 K. Point out any unusual structural features. 

A number of 1,2,3-oxathiazole 5-oxides are prepared from the reaction of thionyl chloride with various ethane derivatives having vicinal oxygen- and nitrogen-containing groups. Reaction of the 2-aminoethanol derivative (146) with SOCI2 gave (147) (see Chapter 4.34). 

The 4-unsaturated-5-oxazolones provide convenient starting materials for the synthesis of other nitrogen-containing heterocyclic systems. The preparation of tetrazoles and isoquinolines is discussed in Sections II,B, 1 and II,B,2,b. 

The following nitrogen containing phosphinic acid derivatives have been proposed as chelating and wetting agents [184]. They were prepared from chloromethylphosphinic acid with the appropriate amines see Eq. (Ill) ... 

A Diels-Alder reaction of arynes with 1,2,4-triazines 102 allows the preparation of isoquinolines substituted with electron-withdrawing groups in the nitrogen-containing ring. The isoquinoline-1-carboxylic esters bearing additional substituents are of particular interest because they are not readily available by the usual routes [100,101] (Scheme 2.42). 

Chalcone dibromides are advantageous intermediates for the preparation of various nitrogen-containing heterocycles (refs. 1-4). In the case of exocyclic a,P-unsaturated ketones, however, only few examples are known concerning the utilization of their dibromides for such purposes (ref. 5). Our aim was, therefore, the synthesis of the dibromides of various exocyclic a,P-unsaturated ketones (ref. 6) and to study their chemical transformations. In our present paper the reaction of such dibromides with azide nucleophile is reported. 

D. S. Treybig and R. G. Martinez. Compositions prepared from hydrocarbyl substituted nitrogen-containing aromatic heterocyclic compounds, an aldehyde and/or ketone and an amine. Patent US 4871848, 1989. 

Aqueous aza-Diels-Alder reactions of chiral aldehydes, prepared from carbohydrates and with benzylamine hydrochloride and cyclopentadiene, were promoted by lanthanide triflates (Eq. 12.65).137 The nitrogen-containing heterocyclic products were further transformed into aza sugars, which are potential inhibitors against glycoprocessing enzymes. 

Boron nitride may be obtained in three primary crystalline modifications (2) a, j3, and y. The most commonly encountered a form has a graphitic structure (hexagonal cell, a = 2.504 A, c = 6.661 A). For many years, this modification has been prepared from combinations of cheap boron and nitrogen containing reagents, e.g. B(0H)3 and (NH2)C0, B(0H)3, C and N2 or KBH4 and NH4C1 (3-5). More... 

Boron-containing nonoxide amorphous or crystalline advanced ceramics, including boron nitride (BN), boron carbide (B4C), boron carbonitride (B/C/N), and boron silicon carbonitride Si/B/C/N, can be prepared via the preceramic polymers route called the polymer-derived ceramics (PDCs) route, using convenient thermal and chemical processes. Because the preparation of BN has been the most in demand and widespread boron-based material during the past two decades, this chapter provides an overview of the conversion of boron- and nitrogen-containing polymers into advanced BN materials. 

Diastereoselective intramolecular cycloaddition of nitrones is useful for constructing nitrogen- containing cyclic structures. The reaction serves as a key step in a number of natural product syntheses.63 Tufarriello and coworkers have used this strategy for preparing cocaine and other alkaloids.74 As a classical example, enantioselective total synthesis of (+)-luciduline is presented in Scheme 8.13, in which a useful feature of the 1,3-dipolar addition of nitrones is nicely illustrated.75... 

Nitrogen-containing carbon replicas of SBA-15 and MLV prepared from pyrrole as carbon precursor... 

The nitrogen-containing carbonaceous replicas of siliceous materials were prepared and studied with the nitrogen adsorption, TEM, TGA, XPS, and EDX methods. The carbons obtained using SBA-15 as a matrix exhibited well-developed and highly ordered porous structures. Those from the MLV material showed lower sorption capacities and 3-D structures less ordered as in the case of the SBA-15 replicas. 

In the present work, a different technique (pyrrole polimerisation and carbonisation) has been applied to prepare nitrogen-containing carbons from mesoporous materials. The influence of iron present in the matrix skeletons, introduced by impregnating the matrices with FeCl3, on the properties of the carbon replicas has been evaluated. 

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