Phenyl azide 1 and several substituted benzyl azides 2a‐o underwent 1,3‐dipolar cycloaddition reactions with dimethyl acetylenedicarboxylate 3, phenylacetylene 4 and ethyl propiolate 5 to afford the triazoles 6‐13. The reactions of these azides with ethyl propiolate were found to be completely regiospecific.

No abstract

No abstract

Corrosion inhibitors represent the most cost effective and flexible means of controlling internal corrosion associated with oil and gas production. Tests were carried out to demonstrate the structure/effect relationships which are effective in controlling the inhibition efficiency. To illustrate this approach, the substituent field effect at the paraposition of 1(Benzyl)1‐H‐4,5‐Dibenzoyl‐1,2,3‐ Triazole (BDBT) on corrosion inhibition has been investigated. Mild steel rotating cylinder electrode in acid media was used in conjunction with Tafel polarization technique, AC impedance measurements and continuous linear polarization resistance method. The nitro group was found to cause a considerable decrease in the corrosion inhibition of the parent compound BDBT. Owing to the induction effects of Br on the aromatic ring the bromo derivative has better inhibition protection than the methyl derivative. The corrosion rate profiles obtained from on‐line polarization technique showed that the inhibition capacity of the studied substituents at the para‐position increases as follows: NO2 < CH3 < Br < H.

No abstract

We review in this article some of our work which has been published over the last fifteen years in the area of 1,3-dipolar cycloaddition reactions of substituted benzyl azides with acetylenic compounds to form the corresponding 1,2-3-triazoles. Several triazole derivatives were transformed into triazolopyridazine and triazolo-1,3,4-oxadiazole derivatives upon their reactions with hydrazine.

Three 1,1'-[phenylenebl«(methylene)]ble(trlazole-4,5-dlcarboxaldehyde) tetrakls(ethyl acetals) (IIIa-c) were synthesized by the condensation of acetylenedicarboxaldehyde bls(diethyl acetal) with 1,2-, and 1,3-, and 1,4-bls(azldomethyl)benzene.

No abstract