Organophosphorverbindungen LXXIII . Abfangreaktion eines “in situ” erzeugten Silens mit tBuCP. Bildung eines Diphosphatricyclobenzoheptans
摘要:
Silene 5 can be generated thermally from the disilacyclobutane 4 by [2 + 2] cycloreversion and trapped by reaction with two equivalents of phosphaalkyne 2 under formation of the disphosphatricyclobenzoheptane 6. Low-temperature X-ray crystal structure analysis,confirms the result. A plausible reaction mechanism, based above all on cycloaddition steps and an ene reaction, is presented.
The mass spectra of some tris(trimethylsilyl)acylsilanes and tris(trimethylsilyl)silanes
作者:Adrian G. Brook、Alex. G. Harrison、R. Krishna M. R. Kallury
DOI:10.1002/oms.1210170803
日期:1982.8
AbstractWhile tris(trimethylsilyl) alkanoylsilanes fragment in the acylsilane form yielding [(Me3Si)3SiCO]+ by α‐cleavage, the molecular ions of their aryl counterparts rearrange to ionized silaethenes prior to cleavage, paralleling known photochemical behaviour. Sila‐allyl type structures are attributed to the stable [MMe˙]+ ions obtained by subsequent cleavage. Metastable ion characteristics reveal the identity of the structures of the monomeric silaethene ions obtained from one of the aroylsilanes and a 1,2‐disilacyclobutane. The non‐compliance of the alkanoylsilanes with their photochemical behaviour is attributed to a preferred elimination of the stable alkyl radical (R˙) from the molecular ions. Several polysilanes display abundant odd‐electron ions which may possess a disilene structure.