Occurrence of <i>trans</i> monounsaturated and polyunsaturated fatty acids in <i>Colwellia psychrerythraea</i> strain 34H

range was 4 kbar. The results, shown in Figure 1, may be summarized by the statement that the activation volume for the concerted shift (I) equals -30 ± 5 cm3/mol and that for the stepwise reaction (II) is +10 ± 2 cm3/mol. These observations clearly confirm that this activation parameter provides a criterion for concertedness in sigmatropic shifts as well as for cycloadditions.Acknowledgment. The National Science Foundation generously supported this investigation. References and Notes(1) Paper 52 in the Series "Kinetics of Reactions in Solutions under Pressure".(2) Summarized in W.

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Preparation and characterization of tantalum(III) olefin complexes and tantalum(V) metallacyclopentane complexes made from acyclic .alpha. olefins

McLain¹,

Wood²,

Schrock³

1979

J. Am. Chem. Soc.

129

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Multiple metal-carbon bonds. 13. Preparation and characterization of monocyclopentadienyl mononeopentylidene complexes of niobium and tantalum including the first details of an .alpha.-abstraction process

Wood¹,

McLain²,

Schrock³

1979

J. Am. Chem. Soc.

129

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Reaction of carbon monoxide with (.eta.5-pentamethylcyclopentadienyl)tetramethyltantalum. Intramolecular reductive coupling of carbon monoxide via an ".eta.2-acetone" intermediate

Wood¹,

Schrock

1979

J. Am. Chem. Soc.

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C. D. Wood

Multiple metal-carbon bonds. 9. Preparation and characterization of several alkylidene complexes, M(.eta.5-C5H5)2(alkylidene)X (M = tantalum or niobium), and the x-ray structure of Ta(.eta.5-C5H5)2(CHC6H5)(CH2C6H5). An investigation of alkylidene ligand rotation

Multiple metal-carbon bonds. 10. Thermally stable tantalum alkylidyne complexes and the crystal structure of Ta(.eta.5-C5Me5)(CPh)(PMe3)2Cl

Preparation and characterization of tantalum(III) olefin complexes and tantalum(V) metallacyclopentane complexes made from acyclic .alpha. olefins

Multiple metal-carbon bonds. 13. Preparation and characterization of monocyclopentadienyl mononeopentylidene complexes of niobium and tantalum including the first details of an .alpha.-abstraction process

Reaction of carbon monoxide with (.eta.5-pentamethylcyclopentadienyl)tetramethyltantalum. Intramolecular reductive coupling of carbon monoxide via an ".eta.2-acetone" intermediate

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