The article considers the issue of relevance of non-destructive testing, as well as some features of the use of non-destructive testing devices in the judicial construction and technical expert examination. Conducting construction and technical expert examination is impossible without accurate measurements, which attaches conditions for the use of various methods, technologies, devices and tools. Among them, one should separately distinguish a group of non-destructive testing devices that allow measuring facilities of research without damage and simultaneous obtaining of reliable features of parameters determining the technical condition of the facilities being examined.

Keywords: judicial construction and technical expert examination, expert, non-destructive testing, non-destructive testing methods, non-destructive testing devices

The process of 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxyl/I2 mediated oxidation of 5-hydroxylmethylfurfural in a twophase system consisting of a methylene chloride and aqueous solution containing sodium hydrogen carbonate was investigated. It was shown that the introduction into the reaction system collidine provides selective oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran (yield 99% at a selectivity of 100%).The optimal composition of the system and the optimal conditions of synthesis were determined. A mechanism of promoting the oxidation of the OH- group of 5-hydroxymethylfurfural and protecting the further oxidation of 2,5-diformylfuran by collidine was proposed.

Keywords: 5-hydroxymethylfurfural, 2,5-diformylfuran, nitroxyl radical, collidine