An alternative synthesis of Vollhardt’s [1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene]cyclopentadienylcobalt and selective formation of its dimer
摘要:
Coupling of bistrimethylsilylpropargylic alcohol over CpCo(CO)(2) to give the respective ortho and para bishydroxymethyl substituted cyclobutadiene complexes is reported. The trimethylsilyl groups have a stereo directing effect furnishing an 8:1 ratio of ortho/para. Transformation of the hydroxymethyl groups leads to the formation of the title compound [1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene]cyclopentadienylcobalt. (C) 1999 Elsevier Science S.A. All rights reserved.
An alternative synthesis of Vollhardt’s [1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene]cyclopentadienylcobalt and selective formation of its dimer
摘要:
Coupling of bistrimethylsilylpropargylic alcohol over CpCo(CO)(2) to give the respective ortho and para bishydroxymethyl substituted cyclobutadiene complexes is reported. The trimethylsilyl groups have a stereo directing effect furnishing an 8:1 ratio of ortho/para. Transformation of the hydroxymethyl groups leads to the formation of the title compound [1,2-diethynyl-3,4-bis(trimethylsilyl)cyclobutadiene]cyclopentadienylcobalt. (C) 1999 Elsevier Science S.A. All rights reserved.