Ring expansion of indene by photoredox-enabled functionalized carbon-atom insertion
作者:Fu-Peng Wu、Chetan C. Chintawar、Remy Lalisse、Poulami Mukherjee、Subhabrata Dutta、Jasper Tyler、Constantin G. Daniliuc、Osvaldo Gutierrez、Frank Glorius
DOI:10.1038/s41929-023-01089-x
日期:——
carbyne precursor that facilitates the insertion of carbon atoms bearing a variety of functional groups, including trifluoromethyl, ester, phosphate ester, sulfonate ester, sulfone, nitrile, amide, aryl ketone and aliphatic ketone fragments to access a library of 2-substituted naphthalenes. The application of this methodology to the skeletal editing of molecules of pharmaceutical relevance highlights its
Reaction of YbI2 with two equivalents of cyclopentylindenyl lithium (C5H9C9H6Li) affords ytterbium(II) substituted indenyl complex (C5H9C9H6)(2)Yb(THF)(2) (1) which shows high activity to ring-opening polymerization (ROP) of lactones. The reaction between YbI2 and cyclopentylcyclopentadienyl sodium (C5H9C5H4Na) gives complex [(C5H9C5H4)(2)Yb(THF)](2)O-2 (2) in the presence of a trace amount of O-2, the molecular structure of which comprises two (C5H9C5H4)(2)Yb(THF) bridged by an asymmetric O-2 unit. The O-2 unit and ytterbium atoms define a plane that contains a C-i symmetry center. (C) 2002 Elsevier Science B.V. All rights reserved.
Carbocation catalysed ring closing aldehyde–olefin metathesis
作者:Shengjun Ni、Johan Franzén
DOI:10.1039/c8cc06734a
日期:——
4-Phenylphenyl-diphenylmethylium tetrafluoroborate catalyses a rare high yielding intramolecular aldehyde–olefin metathesis of enals under mild reaction conditions and low catalyst loading.
spectroscopy and single-crystal X-ray analysis. The results of X-ray crystal structuraldetermination reveal that the hapticity of indenyl ligand in complex 1 or 2 is significantly distorted away from an idealized η5 mode to an unsymmetrical η3 mode. Furthermore, the structures of (R–Ind)Ni(PPh3)Cl exhibit a progressively more distorted coordination of the indenyl ring from cyclopentyl to benzyl. Both