Molybdenum (Vi) imido complexes derived from chelating phenols: Synthesis, characterization and ɛ-caprolactone rop capability
Catalysts, ISSN: 2073-4344, Vol: 5, Issue: 4, Page: 1928-1947
2015
- 18Citations
- 9Captures
Metric Options: CountsSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Reaction of the bulky bi-phenols 2,2′-RCH[4,6-(t-Bu)2C6H2OH]2 (R = Me LH, Ph LH) with the bis(imido) molybdenum(VI) tert-butoxides [Mo(NR)(NR)(Ot-Bu)] (R = R = 2,6-CH-i-Pr; R = t-Bu, R = CF) afforded, following the successive removal of tert-butanol, the complexes [Mo(NCHi-Pr-2,6)2L] (1), [Mo(NCHi-Pr-2,6)2L] (2) and [Mo(Nt-Bu)(μ-NCF)(L)]2 (3). Similar use of the tri-phenol 2,6-bis(3,5-di-tert -butyl-2-hydroxybenzyl)-4-methylphenol (LH) with [Mo(NCHi-Pr-2,6)(Ot-Bu)] afforded the oxo-bridged product [Mo(NCHi-Pr-2,6)(NCMe)(μ-O)LH] (4), whilst use of the tetra-phenols α,α,α′,α′-tetrakis(3,5-di-tert-butyl-2-hydroxyphenyl)-p- or -m-xylene LpH/LH led to {[Mo(NCHi-Pr-2,6)](μ-L)} (5) or {[Mo(NCHi-Pr-2,6)](μ-L)} (6), respectively. Similar use of [Mo(NCF)(Ot-Bu)] with LH afforded, after work-up, the complex {[Mo(NCF)(Ot-Bu)](μ-L)}·6MeCN (7·6MeCN). Molecular structures of 1, 2·CHCl, 3, 4·6MeCN, 6·2CH, and 7·6MeCN are reported and these complexes have been screened for their ability to ring open polymerize (ROP) ε-caprolactone; for comparative studies the precursor complex [Mo(NCHi-Pr-2,6)Cl(DME)] (DME = 1,2-dimethoxyethane) has also been screened. Results revealed that good activity is only achievable at temperatures of ≥100 °C over periods of 1 h or more. Polymer polydispersities were narrow, but observed molecular weights (M) were much lower than calculated values.
Bibliographic Details
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know