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Creators/Authors contains: "Sita, Lawrence R."

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  1. ; ; (, ACS Catalysis)
    Free, publicly-accessible full text available March 21, 2026
  2. ; ; (, Catalysts)
    The new chiral and configurationally stable cyclopentadienyl amidinate (CPAM) hafnium complexes, (RC, RHf)-2 and (SC, SHf)-3, have been obtained in enantio- and diastereomerically pure form. Upon activation with the borate co-initiator, [PhNHMe2][B(C6F5)4] (B1), 2 and 3 can serve as pre-initiators for the enantioselective living coordinative polymerization (LCP) and living coordinative chain transfer polymerization (LCCTP) of 1,5-hexadiene to provide optically active poly (methylene-1,3-cyclopentane) (PMCP) and end-group-functionalized PMCP (x-PMCP) in scalable quantities, respectively. 13C NMR stereochemical microstructural analyses reveal the role of ligand directing effects for the two-step propagation mechanism of 1,2-migratory insertion/ring-closing cyclization and structure/property relationships for these new PMCP and x-PMCP materials. 
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    Free, publicly-accessible full text available December 1, 2025
  3. ; ; ; ; (, ACS Catalysis)
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  4. ; ; ; (, Polyhedron)
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  5. ; (, ACS Catalysis)
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  6. ; ; ; ; (, ACS Macro Letters)
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  7. ; ; ; (, Organometallics)
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  8. ; ; (, ACS Catalysis)
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  9. ; ; (, Angewandte Chemie International Edition)
    Abstract The (stereoselective) living coordinative copolymerization of 1‐alkenes with 4‐aryl‐1,6‐heptadienes, in both the absence and presence of multiple equivalents of a reversible chain transfer agent, is established as a highly versatile strategy for production of multivariate hyperdimensional functionalized semi‐crystalline or amorphous polyolefins that optionally possess either mono‐ or difunctionalized (telechelic) end‐groups in combination with a programmable level of incorporation of orthogonal functional groups within the main‐chain. The non‐conjugated diene comonomers are readily obtained from a diverse range of aryl carboxaldehyde precursors through a one‐step bis‐allylation process. These results serve to provide a new platform for exploring the science and technology of a vast new landscape of functionalized classes of polyolefins that are now accessible in practical and scalable quantities. 
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  10. ; ; (, ACS Catalysis)
    null (Ed.)
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