V- -amine

The Rh-catalyzed reactions of lV,./V-aminals with HSiEt2Me and CO (50 atm) at 140 °C in benzene give unique siloxymethylation or ring-expansion products, e.g. 308-310 (equations 118-120)317. Incorporation of two CO molecules and rearrangement of the dimethylamino group take place in the reaction of N, N, N , N -tetramethylmethylenediamine (equation 119)317. 

Modern Aldol Reactions contains several pertinent reviews (i) catalytic enantiose-lective aldols with chiral Lewis bases 97 (ii) the aldol-Tishchenko reaction 98 (iii) titanium—enolate aldols 99 (iv) crossed aldols mediated by boron and silicon enolates 100 (v) amine-catalysed aldols 101 and (vi) aldols catalysed by antibodies.102... 

The co-ordination chemistry of vanadium(n) has been extended by the preparation and characterization of complexes with aliphatic and heterocyclic amines.365 Intense charge-transfer bands dominate the reflectance spectrum of the dark-red or red-brown V(amine)4X2 complexes (amine = py, / - and y-picoline X = Cl, Br, or I) but assignments of some of the d-d transitions indicate a trans-dihalogeno structure this is consistent with the spin-only magnetic moments ca. 3.87 BM. In contrast, the yellow V(amine)2Br2 complexes obtained with / - and y-picoline exhibit considerable antiferromagnetic interaction indicative of polymeric bromine-bridged structures. 

V-aminated end-imino (imino-bridged) compounds like 392 (86JHC1331). These products result from the addition of the reagent to the keto group without dehydration, followed by regiospecific cyclization of the secondary amino function into the vinylene group. 

The amination of 5-phenyl-l,5-dihydro[l,2,3]triazolo[4,5- /]-l,2,3-triazole (31) with o-(mesityl-sulfonyl)hydroxylamine afforded two V-aminated products distinguishable on the basis of their l3C NMR spectra (Equation (1)). The major product (46%), showed one carbon signal other than those from the phenyl ring and was therefore assigned as the symmetrical 2-amino derivative (32). The minor product showed two l3C signals in addition to those from the phenyl ring and was believed to be represented by structure (33) or (34) (33) is the preferred isomer on the basis of the similarity of its NMR spectrum to that of known l-acetyl-5-phenyltriazolotriazole. 

A simple ICP-AES analysis procedure for biological (liver, total diet, egg) materials was developed, based on the extraction with a commercial, water-soluble, tertiary amine solution [13]. CRMs were dispersed in a 10 percent (v/v) amine mixture at pH 8 and the resulting dispersion (suspension) was stirred for 30 min at room temperature. After centrifugation, Al, Ca, Cu, Fe, K, Mg, Mn, Na, and Zn were determined by ICP-AES in the supernatant. 

Pyrazine with hydroxylamine-O-sulfonic acid underwent (V-amination to give A -aminopyrazinium derivatives (610). 

Protonation (65JCS2778,64JCS4226) and Af-methylation of the parent heterocycle (77HC(30-2)117) both occur at N-2. )V-Amination of imidazo[l,5-a]pyridine and 1-substituted deriva-... 

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