Synthesis of monoalkoxide monopyrrolyl complexes Mo(NR)(CHR')(OR'')(pyrrolyl): enyne metathesis with high oxidation state catalysts.

摘要: Addition of 1 equiv ROH to Mo(NAr)(CHCMe2Ph)(Me2Pyr)2 (Ar = 2,6-i-Pr2C6H3, Me2Pyr 2,5-dimethylpyrrolyl) in diethyl ether or THF yields Mo(NAr)(CHCMe2Ph)(OR)(Me2Pyr) species where R (CH3)3C (1, 22% isolated yield), (CH3)2CH (2, 83%), Ar (3, 81%), (CF3)2CH (4, 45%), (CF3)2(CH3)C (5, 80%). Ring-closing enyne metathesis by various catalysts leads cyclic products that arise through initial addition the triple bond a methylene (initially neophylidene) yield an α- β-substituted metallacyclobutene intermediate.