PUB - Publikationen an der Universität Bielefeld

The reaction of 1,8-dilithionaphthalene (1) with methylene-bis[(dialkylamino)chlorophosphanes] [R2N(CI)PCH2P(Cl)-NR2; R = Me (2a), Et (2b)] leads to the formation of new heterocyclic compounds, 1,3-diphospha-2,3-dihydro-1H-phenalenes 3a,b as a mixture of cis and trans isomers, DFT calculations indicate that the cis isomers are thermodynamically more stable by about 1-3 kcal/mol than the trans isomers. Compounds 3a,b can be converted into dithio the derivatives 5a,b and the borane complexes 6a,b, which were characterized by NMR spectroscopy and investigated by X-ray diffraction analysis. The dialkylamino groups in 3 can be substituted by chlorine to give the chlorophosphane 7.