Selenid des Phenyl-1-dimethyl-3,4-phosphol;3,4-dimethyl-1-phenyl-1H-phosphole 1-selenide;3,4-Dimethyl-1-phenyl-1-selanylidene-1lambda5-phosphole;3,4-dimethyl-1-phenyl-1-selanylidene-1λ5-phosphole
Gold(I) complexes bearing monophosphole ligands were synthesized, and their electronic and steric properties were compared to those of their triphenylphosphine-based counterparts. Cationic phosphole-based gold(I) complexes are active and selective in enyne cycloisomerization and in olefin cyclopropanation, with a good correlation between the ligand σ-donor ability and the catalytic activity. For the
Stereoselective hetero Diels-Alder reaction of selenoaldehydes, generated by thermal retro Diels-Alder reaction of anthracene cycloadducts, with pentavalent 3,4-dimethylphosphole chalcogenides at 110 degrees C in toluene to give the corresponding [4+2] cycloadducts as a single diastereoisomer in good yields, accompanied by a slight scrambling of chalcogen atoms. Higher reaction temperature led to an increase of the scrambling between chalcogen atoms. (c) 2007 Elsevier Ltd. All rights reserved.