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We report the synthesis of Mo and W MAP complexes that contain O-2,6-(2,5-R 2 -pyrrolyl) 2 C 6 H 3 (2,6-dipyrrolylphenoxide or ODPP R ) ligands in which R = i-Pr, Ph. W(NAr)(CH-t-Bu)(Pyr)(ODPP Ph ) ( 4a ; Ar = 2,6-disopropylphenyl, Pyr = pyrrolide) reacts readily with ethylene to yield a metallacyclobutane complex, W(NAr)(C 3 H 6 )(Pyr)(ODPP Ph ) ( 5 ). The structure of 5 in the solid state shows that it is approximately a square pyramid with the WC 4 ring spanning apical and basal positions. This SP' structure, which has never been observed as an actual intermediate, must now be regarded as an integral feature of the metathesis reaction.

organometallics

Monoaryloxide Pyrrolide (MAP) Imido Alkylidene Complexes of Molybdenum and Tungsten That Contain 2,6-Bis(2,5-R<sub>2</sub>-pyrrolyl)phenoxide (R = i-Pr, Ph) Ligands and an Unsubstituted Metallacyclobutane on Its Way to Losing Ethylene

Monoaryloxide Pyrrolide (MAP) Imido Alkylidene Complexes of Molybdenum and Tungsten That Contain 2,6-Bis(2,5-R2-pyrrolyl)phenoxide (R = i-Pr, Ph) Ligands and an Unsubstituted Metallacyclobutane on Its Way to Losing Ethylene

Monoaryloxide Pyrrolide (MAP) Imido Alkylidene Complexes of Molybdenum and Tungsten That Contain 2,6-Bis(2,5-R₂-pyrrolyl)phenoxide (R = i-Pr, Ph) Ligands and an Unsubstituted Metallacyclobutane on Its Way to Losing Ethylene