Cyclic derivatives

C3N3CJ3. M.p. 154X, b.p. 190X. Cyclic derivative prepared by polymerization of CICN... 

Both compounds are soluble in water and are readily hydrolysed to sulphamic acid, HjN S03" andammonia the hydrogen atoms are in each case replaceable by metals to form salts. Many derivatives of sulphamide and cyclic derivatives of sulphimide are known. 

In a similar reaction the bis-tosylate shown below was to be converted into a bis-malonate derivative. In this cyclic derivative both groups are hold closely together and intramolecular reactions proved to be so much faster than intermolecular substitution under all ex-... 

Urea. Urea (carbamide) CH4N2O, is the most important building block for amino resins because urea—formaldehyde is the largest selling amino resin, and urea is the raw material for melamine, the amino compound used in the next largest selling type of amino resin. Urea is also used to make a variety of other amino compounds, such as ethyleneurea, and other cyclic derivatives used for amino resins for treating textiles. They are discussed later. 

Free-radical reactions in the synthesis of diketopiperazines and other cyclic derivatives of a-aminoacids 97CRV53. 

Acetic add, ethylenediaminetetra-, 4,253 add-base equilibria, 2,779 in analysis, 1,522 complexes composition, 2,783 coordination numbers, 2,783 solid state structure, 2,783 cyclic derivatives complexes, 2,785 in electroplating, 6,14 heteroatom derivatives metal complexes, 2, 786 homologs... 

Fig. 34 Preparation of a 4-thiazolidinone library using an ionic liquid support. Reagents and conditions a MW 100 °C, l-2h, open vessel b R"NH2, t-BuOK, MW 100-150°C, 10-20 min. R = H, Me, CH2COOH R = Pr, i-Pr, i-Bu, Bn, piperonyl, CH2CH(OMe)2, CH2CH CH2 R" = Pr, Bu, Bn, or cyclic derivatives as piperonyl, piperidine, pyrrolidine,...

The elimination is of course syn, so the product is sterically controlled. Alkenes that are not sterically favored can be made this way in high yield (e.g., cis-PhCH2CH=CHCH2Ph). Certain other five-membered cyclic derivatives of 1,2-diols can also be converted to alkenes. ... 

When excess amounts of the HHT of phenyl glycinate 42 were used with diphenyl phosphite, the preferred product was the novel cyclic derivative 45 (2). Presumably, ring-opening of the HHT produced intermediate 43 first, which lost an equivalent of glycinate formaldimine to give 44. The proximity of the activated phenyl carboxylate ester to the N-H in 44 presumably promoted intramolecular cyclization to 45 with loss of phenol (2). 

The same product, as well as CpFe(CO)[P( -Bu)3]CO(CH2)2CH=C= CHMe, is obtainable by treatment of (XXVI R = H, R = Me) with P(n-Bu)3 under similar conditions. However, the reaction between CpFe(CO)2CH2CH2CH=-CH2 and PPh3 yields only CpFe(CO)(PPhj)-C0CH2CH2CH=CH2. Cyclic derivatives similar to (XXVII) result from thermal decomposition of CpFe(CO)2CH2CR2CH=CH2 (R = H or Me) 103). 

Phosgene has been used to from a wide range of cyclic derivatives... 

Selenium(IV) reacts with substituted 1,2-diaminobenzene or 2,3-diamlnonaphthalene in acidic solution to form stable cyclic derivatives which can t>e extracted into an organic solvent and analyzed by gas or liquid chromatography [682,683]. With chloro-, bromo-, or nitro-substituents the plazselenols can be determined with an electron-capture detector at the low picogram level. Se(VI) does not form piazselenol derivatives so the reaction with diaminobenzene can be used to determine the concentration of Se(IV) and Se(VI). Selenium(VI) may be redu to Se(IV) with... 

Figure 8.36 Some examples of the reactions used to foz-m cyclic derivatives of bifunctlonal compounds...

The reaction of dicarbonyl compounds, such as glyoxal or phenylglyoxal, with a guanidinyl group, such as that of an arginine residue, proceeds to yield a more stable linkage due to the formation of a cyclic derivative (Reaction 46). 

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