We classify trace scaling automorphisms of W ⊗ K up to outer conjugacy, where W is a certain simp... more We classify trace scaling automorphisms of W ⊗ K up to outer conjugacy, where W is a certain simple separable nuclear stably projectionless C *-algebra having trivial K-groups. Also, we show that all automorphisms of W with the Rohlin property are outer conjugate to each other. Moreover, we show that the central sequence C *-algebra F (W) of W is infinite, which answers a question of Kirchberg.
Highly Strained para-Phenylene-Bridged Macrocycles from Unstrained 1,4-Diketo Macrocycles
Synlett
The conversion of macrocyclic 1,4-diketones to highly strained para-phenylene rings has recently ... more The conversion of macrocyclic 1,4-diketones to highly strained para-phenylene rings has recently been reported by our laboratory. This synthetic strategy represents a non-cross-coupling-based approach to arene-bridged macrocycles, and an alternative to palladium- and nickel-mediated processes. In this Synpacts article we discuss the development of endgame aromatization protocols for the synthesis of increasingly strained arene systems, as well as potential advantages of the macrocyclic 1,4-diketone approach to selectively functionalized benzenoid macrocycles for future complexity building reactions.1 Introduction2 A Non-Cross-Coupling-Based Approach to Arene-Bridged Macro cycles3 Macrocyclic 1,4-Diketones: Streamlined Synthesis and Size-Dependent Diastereoselective Grignard Reactions4 Dehydrative Aromatization Reactions: A Powerful Tool for Synthesizing Highly Strained para-Phenylene Units5 Conclusion
A Macrocyclic 1,4-Diketone Enables the Synthesis of ap-Phenylene Ring That Is More Strained than a Monomer Unit of [4]Cycloparaphenylene
Organic Letters, 2016
The synthesis of a p-terphenyl-based macrocycle, containing a p-phenylene unit with 42.6 kcal/mol... more The synthesis of a p-terphenyl-based macrocycle, containing a p-phenylene unit with 42.6 kcal/mol of strain energy (SE), is reported. The conversion of a macrocyclic 1,4-diketone to a highly strained arene system takes place over five synthetic steps, featuring iterative dehydrative reactions in the aromatization protocol. Spectroscopic data of the deformed benzenoid macrocycle are in excellent agreement with other homologues that have been reported, indicating that the central p-phenylene ring of 9 is aromatic.
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Papers by Nirmal Mitra