Four-membered ring compounds containing bis(methylene)cyclobutene or tetrakis(methylene)cyclobutane moieties. Benzocyclobutadiene, benzodicyclobutadiene, biphenylene, and related compounds

Article Abstract:

A series of cyclic compounds bearing either bis(methylene)cyclobutene or tetrakis(methylene)cyclobutane molecules were prepared and studied. Synthetic studies indicated that bond angle strain and cyclobutadiene incorporation limited the production of these compounds. Reactivity and structural determinations using H nuclear magnetic resonance, infrared and X-ray crystallographic analyses were also conducted. Results showed that despite the presence of restricting factors, these compounds underwent various reactions providing valuable reactive intermediates.

X-ray crystallography, Infrared spectroscopy, Chemical reactions, Cyclic compounds

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The chemistry of diposphenes and their heavy congeners: synthesis, structure, and reactivity

Article Abstract:

The preparation of a series of diphosphenes and their derivatives was presented. Structural and reactivity studies using X-ray crystallographic and P nuclear magnetic resonance analyses were conducted to characterize the compounds. The compounds underwent various reactions which included electrophilic, nucleophili, metal complexation and cycloaddition interactions. Moreover, diarsenes and their intermediates were also synthesized utilizing similar principles.

Computer simulation, Surface chemistry, Organophosphorus compounds, Organic phosphorus compounds, Optics, Physiological, Physiological optics

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Heavy allenes and cumulenes E=C=E' and E=C=C=E' (E = P, As, Si, Ge, Sn; E' = C, N, P, As, O, S)

Article Abstract:

This paper discusses synthesis and characterization of low-coordinate species of group 14 and 15 elements of diphosphenes and disilenes. Research reveals that the presence of two cumulated double bonds confers special structures on the E=C=E' derivatives. Data are presented on the phosphorous derivatives of these allenic compounds with bulky groups involved in their stabilization.

France, Statistical Data Included, Analysis, Reactivity (Chemistry), Coordination compounds, Metal complexes (Chemistry), Chemical bonds

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