Activation of a water molecule under mild conditions by ruthenacyclopentatriene: mechanism of hydrative cyclization of diynes.
نویسندگان
چکیده
A ruthenium cyclic biscarbene complex reacted with a H(2)O molecule under mild conditions to produce η(5)-oxapentadienyl complex, that proved to be the intermediate in the catalytic hydrative cyclization of a diyne.
منابع مشابه
Ruthenium-catalyzed hydrophosphinylative cyclization of 1,6-diynes. Stereoselective synthesis of exocyclic 1,3-dienylphosphine oxides.
The first catalytic synthesis of exocyclic 1,3-dienylphosphine oxides was achieved by the ruthenium-catalyzed selective hydrophosphinylative cyclization of 1,6-diynes. A plausible mechanism involving a ruthenacyclopentatriene intermediate is proposed on the basis of the DFT calculations of model ruthenium complexes.
متن کاملCationic rhodium(I)/bisphosphine complex-catalyzed cyclization of 1,6-diynes with carboxylic acids.
A cationic rhodium(I)/bisphosphine complex catalyzes carboxylative cyclizations of 1,6-diynes, leading to cyclic dienyl carboxylates, in high yields with high chemo-, regio-, and stereoselectivities under mild reaction conditions.
متن کاملGallium(III)-Promoted Halocyclizations of 1,6-Diynes.
Cyclization of 1,6-diynes promoted by stoichiometric Ga(III) halides produces vinyl halides in good to excellent yields. Under acidic conditions, initially formed iodocyclization products undergo in situ Friedel-Crafts cyclizations, giving access to iodoindenopyridines. Application of the vinyl halides in cross-coupling reactions has been explored, and mechanistic aspects of the cyclization are...
متن کاملRuthenium-catalyzed cyclization/transfer hydrogenation of 1,6-diynes: unprecedented mode of alcohol activation via metallacyclopentatriene.
The first transfer-hydrogenative cyclization of 1,6-diynes that leads to exocyclic dienes was developed using a ruthenium catalyst and MeOH as a H(2) surrogate.
متن کاملZinc-mediated CH-activation of tetrahydrofuran under mild conditions for the regioselective addition to aryl-propiolates.
The CH-activation of THF is realized in a zinc-mediated process using a dibromocyclopropane as a crucial additive. The highly regioselective addition to aryl-substituted propiolates as well as the regio- and stereoselective addition to diynes are described.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Chemical communications
دوره 47 5 شماره
صفحات -
تاریخ انتشار 2011