Journal article

Publication year: 2020

Pages: 16-22

Journal: Žurnal orhaničnoï ta farmacevtyčnoï chimiï = The journal of organic and pharmaceutical chemistry = Žurnal organičeskoj i farmacevtičeskoj chimii

Volume number: 18

Issue number: 2

DOI Link: https://doi.org/10.24959/ophcj.20.199807

Publisher: Nacionalʹna Akademija Nauk Ukraïny

Abstract: 

Aim. To develop preparative methods for functionalization of diamantane dimers.

Results and discussion. The reaction of 1,1′-bisdiamantane with bromine and the subsequent hydrolysis gives 6-hydroxy-1,1′-bіsdіamantane with a yield of 56 %. The reactions of 4,4′-bisdiamantane with nitric acid or liquid bromine followed by hydrolysis leads to a mixture of hydroxy derivatives and 1,1′-dihydroxy-4,4′-bisdiamantane after isomerization in sulfuric acid (with a yield of 73 %). Thus, the reactivity of bisdiamantanes with electrophiles is determined by the higher stability of the carbocations in the medial positions of the cages as shown by DFT computations. Whereas medial bridgehead substitutions dominate in reactions of 4,4′-bisdiamantane with elec­trophiles, the arylation with benzene in the presence of tert-butyl bromide and aluminum chloride gives bis-apical derivative – 9,9’-diphenyl-4,4’-bisdiamantane.

Experimental part. The structure of 6-hydroxy-1,1′-bіsdіamantane was confirmed by X-ray diffraction analysis. The substitution pattern in 1,1′-dihydroxy-4,4′-bisdamantane was confirmed by 2D-NMR spectra. The arylation of 4,4′-bisdiamantane with benzene proceeds as bis-apical substitution to give highly symmetric 9,9’-di­phenyl-4,4’-bisdiamantane in 47 %.

Conclusions. It has been shown that the medial bridgehead substitution dominates in the reactions of bisdia­mantanes with strong electrophiles, and only the arylation of 4,4′-bisdiamantane proceeds as a bis-apical substitution.

Harvard Citation style: Gunchenko, P., Chernish, L., Tikhonchuk, E., Becker, J., Schreiner, P. and Fokin, A. (2020) Functionalizations of Diamantane Dimers, Žurnal orhaničnoï ta farmacevtyčnoï chimiï = The journal of organic and pharmaceutical chemistry = Žurnal organičeskoj i farmacevtičeskoj chimii, 18(2), pp. 16-22. https://doi.org/10.24959/ophcj.20.199807

APA Citation style: Gunchenko, P., Chernish, L., Tikhonchuk, E., Becker, J., Schreiner, P., & Fokin, A. (2020). Functionalizations of Diamantane Dimers. Žurnal orhaničnoï ta farmacevtyčnoï chimiï = The journal of organic and pharmaceutical chemistry = Žurnal organičeskoj i farmacevtičeskoj chimii. 18(2), 16-22. https://doi.org/10.24959/ophcj.20.199807