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In the presence of (dpp-bian)Ga-Ga(dpp-bian) ( 1) and [dpp-bian(Ph)C=C(H)]Ga-Ga[(H)C=C(Ph)dpp-bian] ( 2) {dpp-bian = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene}, phenylacetylene reacts with 1-naphthol to give 2-(1-phenylvinyl)naphthalen-1-ol ( 3). In solution in the presence of complexes 1 or 2, compound 3 undergoes further dimerization to give 2-[4-methyl-2,4-diphenyl-3,4-dihydro-2 H-benzo[ h]chromen-2-yl]naphthalen-1-ol (C36H28O2), whose diastereomers 4 and 5 were isolated in crystalline form. Diastereomer 4 is the kinetically favored product, which, however, undergoes conversion into diastereomer 5 in solution at elevated temperature. The structures of 4 and 5 were determined by single-crystal X-ray analysis. The catalytic activity of complexes 1 and 2 in the hydroarylation reactions of phenylacetylene and some other alkynes with different arenes has been investigated. By the reaction of phenylacetylene with 3,5-di- tert-butylphenol, 5,7-di- tert-butyl-4-methyl-2,4-diphenyl-4 H-chromene ( 7) has been prepared for the first time. [ABSTRACT FROM AUTHOR]

Invited for the cover of this issue is Dr. Alexander Morozov from the G.A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences, Nizhny Novgorod, Russian Federation. The cover image shows two basketball players representing the bis(amide) and the radical anionic ligands, with different modes of binding to the Ti metal. [ABSTRACT FROM AUTHOR]