Solid phase mechanochemical synthesis and mechanoactivated reactions can be considered as one of the rapidly developing trends in the framework of green chemistry [1]. Mechanochemical methods open up high possibilities in heterogeneous catalysis: in particular, compounds regarded as catalytically inert could be involved in catalytic reactions in such a way [1, 2]. Active sites of mechanoactivated catalysts are usually associated [1] with defects in solids. Such states are metastable due to retarded diffusive mobility in solids, and their surface concentrations can essentially exceed the equilibrium concentration as well as that which can be obtained by conventional methods of heterogeneous catalysts activation. However, despite obvious advantages, a progress in this field is strictly restrained by limited data on pathways of mechanical energy transformation into structural defects of different pattern lattice. Most papers dealing with mechanoactivated catalysis are restricted to phenomenological description of the observed effects. In order to clarify the question it is convenient to use relatively clear catalytic systems. For such a model reaction we chose the catalytic acetylene hydrochlorination. The results of reactions mechanisms studies for heterogeneous catalytic acetylene transformations over mechanically activated platinum and palladium complexes will be presented and discussed. The main attention will be paid to the nature of active sites formed by mechanical pre-activation of the catalysts. References: 1. Butyagin P.Yu., Russian Chem. Rev. 63 (12) (1994) 1031. 2. Mitchenko S.A., Khomutov E.V., Shubin А.А., Shul'ga Yu.М.// J. Mol. Catal. A: Chemical. 2004. V.212. P.345-352.

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