LITHIUM DERIVATIVES OF 5-METHYL-5,10-DIHYDROINDENO[1,2-b] INDOLE AND 1,3,5-TRIMETHYL-6H- DIHYDROINDENO[2,1-b] INDOLE. SYNTHESIS AND MOLECULAR STRUCTURE

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Abstract

The reaction of 1,3-dimethyl-5,6-dihydroindeno[2,1-b]indole with methyl iodide in the presence of cetyltrimethylammonium bromide yielded 1,3,5-trimethyl-6H-indeno[2,1-b]indole (L1H). The molecular structure of the compound was confirmed by X-ray diffraction. 1,3,5-Trimethyl-6H-indeno[2,1-b]indole (L1H) and 5-methyl-5,10-indeno[1,2-b]indole (L2H) are metallated with n-butyl lithium in diethyl ether at 0°C to form the corresponding lithium derivatives L1Li(Et2O)2 (1) and L2Li(Et2O)2 (2). According to X-ray diffraction data, lithium complex 2 has a monomeric structure, with two crystallographically independent molecules of the complex located in the independent region of the crystal cell. In molecule 2b, the lithium cation is coordinated by the five-membered ligand cycle by the η5-type, and in molecule 2a, by the η3-type.

About the authors

A. O Tolpygin

Razuvayev Institute of Organometallic Chemistry, Russian Academy of Sciences

Email: toao2@yandex.ru
ORCID iD: 0000-0002-3196-0229
Candidate of Chemical Sciences, Senior Researcher Nizhny Novgorod, Russian Federation

A. V Cherkasov

Razuvayev Institute of Organometallic Chemistry, Russian Academy of Sciences

Email: ach@iomc.ras.ru
ORCID iD: 0000-0001-8095-3562
Junior Researcher Nizhny Novgorod, Russian Federation

G. K Fukin

Razuvayev Institute of Organometallic Chemistry, Russian Academy of Sciences

Email: gera@iomc.ras.ru
ORCID iD: 0000-0002-1184-5418
Doctor of Chemical Sciences, Senior Researcher Nizhny Novgorod, Russian Federation

I. E Nifant'ev

Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Email: inif@ips.ac.ru
ORCID iD: 0000-0001-9151-1890
Doctor of Chemical Sciences, Head of Laboratory Moscow, Russian Federation

A. A Trifonov

Razuvayev Institute of Organometallic Chemistry, Russian Academy of Sciences; Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Author for correspondence.
Email: trif@iomc.ras.ru
ORCID iD: 0000-0002-9072-4517
Doctor of Chemical Sciences, Corresponding Member of the Russian Academy of Sciences, Head of Laboratory Nizhny Novgorod, Russian Federation; Moscow, Russian Federation

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