Synthesis of triynylcarbene complexes and of bi- and trinuclear complexes with heptatriynylidene C7-bridges

Iodo-alkynyl- and iodo-butadiynyl-ruthenium complexes

“…Several hypervalent iodonium derivatives are known [9]. The syntheses of bis(carbene) complexes via iododiynes such as IC"CC"CSiMe 3 has been reported [10], while thermolysis within molecular sieves such as MCM-41 results in polymerisation to form novel oligo-ynes [11].…”

Organotin Reagents in Cross‐Coupling Reactions

“…Hartbaum and Fischer [254] synthesized complexes of tungsten and molybdenum by treating a complex containing an ethynyltin moiety with an iododialkynylsilane (Scheme 6.45) and with complexes of the type HalML n , with M = Fe, Ru, Mn, Re [255]. In an extension of work referred to earlier, Rousset et al [256] prepared (E)-5-(tributylstannylmethylidene)-5H-furan-2-ones from tributylstannylethyne and Otributylstannyl 3-iodopropenoate derivatives.…”

Reactivity of Polyynes: Complex Molecules from Simple Carbon Rods

“…[119,120] In contrast, trialkylsilyl (the most often TMS) protected derivatives are easy in preparation and handling and are broadly used for that pur-pose. There are two reports by Fischer showing utilization of pre-isolated terminal polyynes for the preparation of tin and mercury end-caped compounds.…”

“…This three component reaction needs oligoynates (methyl or ethyl esters with carbon chain up to octatetrayne), tertiary phosphines and electrondeficient derivatives of benzaldehyde as substrates. Selected examples of products (117)(118)(119)(120)(121)(122) are shown in Scheme 8. Polyynes with chain length up to decapentayne were tested and the length of carbon chain did not clearly affect the pattern of the reaction.…”

“…There are two reports by Fischer showing utilization of pre-isolated terminal polyynes for the preparation of tin and mercury end-caped compounds. [119,120] In contrast, trialkylsilyl (the most often TMS) protected derivatives are easy in preparation and handling and are broadly used for that pur-pose. The ability of silver(I) salts to substitute TMS group of alkynes has been known and frequently used in the catalytic transformation of alkynes.…”